10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

þ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Quarterly Period Ended March 31, 2018

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Transition Period from             to             

Commission File No. 1-11778

CHUBB LIMITED

(Exact name of registrant as specified in its charter)

Switzerland	98-0091805
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

Baerengasse 32

Zurich, Switzerland CH-8001

(Address of principal executive offices) (Zip Code)

+41 (0)43 456 76 00

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15 (d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

YES þ                                              NO  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

YES þ                                                 NO  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” "smaller reporting company," and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer þ		Accelerated filer ¨
Non-accelerated filer ¨	(Do not check if a smaller reporting company)	Smaller reporting company ¨
		Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

YES ¨                                                NO  þ

The number of registrant’s Common Shares (CHF 24.15 par value) outstanding as of April 19, 2018 was 465,802,115.

CHUBB LIMITED

INDEX TO FORM 10-Q

Part I.	FINANCIAL INFORMATION		Page
Item 1.	Financial Statements:
	Consolidated Balance Sheets (Unaudited) March 31, 2018 and December 31, 2017		3
	Consolidated Statements of Operations and Comprehensive Income (Unaudited) Three Months Ended March 31, 2018 and 2017		4
	Consolidated Statements of Shareholders' Equity (Unaudited) Three Months Ended March 31, 2018 and 2017		5
	Consolidated Statements of Cash Flows (Unaudited) Three Months Ended March 31, 2018 and 2017		6
	Notes to Consolidated Financial Statements (Unaudited)
	Note 1.	General	7
	Note 2.	Investments	8
	Note 3.	Fair value measurements	13
	Note 4.	Unpaid losses and loss expenses	21
	Note 5.	Debt	24
	Note 6.	Commitments, contingencies, and guarantees	24
	Note 7.	Shareholders’ equity	29
	Note 8.	Share-based compensation	29
	Note 9.	Postretirement benefits	30
	Note 10.	Segment information	30
	Note 11.	Earnings per share	32
	Note 12.	Information provided in connection with outstanding debt of subsidiaries	33
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		38
Item 3.	Quantitative and Qualitative Disclosures About Market Risk		74
Item 4.	Controls and Procedures		77
Part II.	OTHER INFORMATION
Item 1.	Legal Proceedings		77
Item 1A.	Risk Factors		77
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds and Issuer Repurchases of Equity Securities		77
Item 5.	Other Information		78
Item 6.	Exhibits		78

2

PART I FINANCIAL INFORMATION

ITEM 1. Financial Statements

CONSOLIDATED BALANCE SHEETS (Unaudited)

Chubb Limited and Subsidiaries

	March 31			December 31
(in millions of U.S. dollars, except share and per share data)	2018			2017
Assets
Investments
Fixed maturities available for sale, at fair value (amortized cost – $79,208and $77,835)	$	79,111		$	78,939
(includes hybrid financial instruments of$7 and $5)
Fixed maturities held to maturity, at amortized cost (fair value – $14,122 and $14,474)	14,253			14,335
Equity securities, at fair value (cost – $948 and $737)	948			937
Short-term investments, at fair value and amortized cost	2,874			3,561
Other investments (cost – $4,919 and $4,417)	4,919			4,672
Total investments	102,105			102,444
Cash	1,988			728
Restricted cash	125			123
Securities lending collateral	2,039			1,737
Accrued investment income	895			909
Insurance and reinsurance balances receivable	9,570			9,334
Reinsurance recoverable on losses and loss expenses	14,982			15,034
Reinsurance recoverable on policy benefits	181			184
Deferred policy acquisition costs	4,843			4,723
Value of business acquired	321			326
Goodwill	15,686			15,541
Other intangible assets	6,437			6,513
Prepaid reinsurance premiums	2,600			2,529
Investments in partially-owned insurance companies	664			662
Other assets	6,345			6,235
Total assets	$	168,781		$	167,022
Liabilities
Unpaid losses and loss expenses	$	63,139		$	63,179
Unearned premiums	15,495			15,216
Future policy benefits	5,412			5,321
Insurance and reinsurance balances payable	6,148			5,868
Securities lending payable	2,039			1,737
Accounts payable, accrued expenses, and other liabilities	8,618			9,545
Deferred tax liabilities	468			699
Repurchase agreements	1,412			1,408
Short-term debt	1,669			1,013
Long-term debt	12,786			11,556
Trust preferred securities	308			308
Total liabilities	117,494			115,850
Commitments and contingencies
Shareholders’ equity
Common Shares (CHF 24.15 par value; 479,783,864 shares issued; 465,831,486 and 463,833,179 shares outstanding)	11,121			11,121
Common Shares in treasury (13,952,378 and 15,950,685 shares)	(1,727		)	(1,944		)
Additional paid-in capital	13,430			13,978
Retained earnings	28,965			27,474
Accumulated other comprehensive income (loss) (AOCI)	(502		)	543
Total shareholders’ equity	51,287			51,172
Total liabilities and shareholders’ equity	$	168,781		$	167,022

See accompanying notes to the consolidated financial statements

3

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (Unaudited)

Chubb Limited and Subsidiaries

	Three Months Ended
	March 31
(in millions of U.S. dollars, except per share data)	2018			2017
Revenues
Net premiums written	$	7,104		$	6,710
(Increase) decrease in unearned premiums	(77		)	62
Net premiums earned	7,027			6,772
Net investment income	806			745
Net realized gains (losses):
Other-than-temporary impairment (OTTI) losses gross	(1		)	(19		)
Portion of OTTI losses recognized in other comprehensive income (OCI)	—			—
Net OTTI losses recognized in income	(1		)	(19		)
Net realized gains (losses) excluding OTTI losses	(1		)	12
Total net realized gains (losses) (includes $(23) and $(8) reclassified from AOCI)	(2		)	(7		)
Total revenues	7,831			7,510
Expenses
Losses and loss expenses	4,102			3,789
Policy benefits	151			168
Policy acquisition costs	1,464			1,397
Administrative expenses	692			676
Interest expense	157			154
Other (income) expense	(47		)	(70		)
Amortization of purchased intangibles	85			64
Chubb integration expenses	10			111
Total expenses	6,614			6,289
Income before income tax	1,217			1,221
Income tax expense (benefit) (includes $(3) and $(6) on reclassified unrealized losses)	135			128
Net income	$	1,082		$	1,093
Other comprehensive income (loss)
Unrealized appreciation (depreciation)	$	(1,234	)	$	307
Reclassification adjustment for net realized losses included in net income	23			8
	(1,211		)	315
Change in:
Cumulative foreign currency translation adjustment	397			134
Postretirement benefit liability adjustment	(23		)	(20		)
Other comprehensive income (loss), before income tax	(837		)	429
Income tax (expense) benefit related to OCI items	208			(115		)
Other comprehensive income (loss)	(629		)	314
Comprehensive income	$	453		$	1,407
Earnings per share
Basic earnings per share	$	2.32		$	2.33
Diluted earnings per share	$	2.30		$	2.31

See accompanying notes to the consolidated financial statements

4

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited)

Chubb Limited and Subsidiaries

	Three Months Ended
	March 31
(in millions of U.S. dollars)	2018			2017
Common Shares
Balance – beginning and end of period	$	11,121		$	11,121
Common Shares in treasury
Balance – beginning of period	(1,944		)	(1,480		)
Common Shares repurchased	—			(140		)
Net shares redeemed under employee share-based compensation plans	217			222
Balance – end of period	(1,727		)	(1,398		)
Additional paid-in capital
Balance – beginning of period	13,978			15,335
Net shares redeemed under employee share-based compensation plans	(262		)	(260		)
Exercise of stock options	(16		)	(21		)
Share-based compensation expense	62			65
Funding of dividends declared to Retained earnings	(332		)	(324		)
Balance – end of period	13,430			14,795
Retained earnings
Balance – beginning of period	27,474			23,613
Cumulative effect of adoption of accounting guidance (refer to Note 1)	409			—
Balance – beginning of period, as adjusted	27,883			23,613
Net income	1,082			1,093
Funding of dividends declared from Additional paid-in capital	332			324
Dividends declared on Common Shares	(332		)	(324		)
Balance – end of period	28,965			24,706
Accumulated other comprehensive income
Net unrealized appreciation on investments
Balance – beginning of period	1,450			1,058
Cumulative effect of adoption of accounting guidance (refer to Note 1)	(416		)	—
Balance – beginning of period, as adjusted	1,034			1,058
Change in period, before reclassification from AOCI, net of income tax     benefit (expense) of $226 and $(102)	(1,008		)	205
Amounts reclassified from AOCI, net of income tax expense of $(3) and $(6)	20			2
Change in period, net of income tax benefit (expense) of $223 and $(108)	(988		)	207
Balance – end of period	46			1,265
Cumulative foreign currency translation adjustment
Balance – beginning of period	(1,187		)	(1,663		)
Change in period, net of income tax expense of $(19) and $(3)	378			131
Balance – end of period	(809		)	(1,532		)
Postretirement benefit liability adjustment
Balance – beginning of period	280			291
Change in period, net of income tax benefit (expense) of $4 and $(4)	(19		)	(24		)
Balance – end of period	261			267
Accumulated other comprehensive income (loss)	(502		)	—
Total shareholders’ equity	$	51,287		$	49,224

See accompanying notes to the consolidated financial statements

5

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)

Chubb Limited and Subsidiaries

	Three Months Ended March 31
(in millions of U.S. dollars)	2018			2017
Cash flows from operating activities
Net income	$	1,082		$	1,093
Adjustments to reconcile net income to net cash flows from operating activities
Net realized (gains) losses	2			7
Amortization of premiums/discounts on fixed maturities	155			184
Amortization of purchased intangibles	85			64
Deferred income taxes	(2		)	(127		)
Unpaid losses and loss expenses	(420		)	(154		)
Unearned premiums	111			17
Future policy benefits	58			40
Insurance and reinsurance balances payable	250			252
Accounts payable, accrued expenses, and other liabilities	(724		)	(491		)
Income taxes payable	88			191
Insurance and reinsurance balances receivable	(174		)	30
Reinsurance recoverable on losses and loss expenses	138			(122		)
Reinsurance recoverable on policy benefits	3			(5		)
Deferred policy acquisition costs	(75		)	(59		)
Prepaid reinsurance premiums	(42		)	(81		)
Other	16			174
Net cash flows from operating activities	551			1,013
Cash flows from investing activities
Purchases of fixed maturities available for sale	(5,972		)	(6,250		)
Purchases of fixed maturities held to maturity	(162		)	(157		)
Purchases of equity securities	(55		)	(37		)
Sales of fixed maturities available for sale	2,562			3,395
Sales of equity securities	40			46
Maturities and redemptions of fixed maturities available for sale	1,865			2,543
Maturities and redemptions of fixed maturities held to maturity	255			240
Net change in short-term investments	731			232
Net derivative instruments settlements	39			(89		)
Private equity contributions	(353		)	(198		)
Private equity distributions	201			315
Other	(32		)	(106		)
Net cash flows used for investing activities	(881		)	(66		)
Cash flows from financing activities
Dividends paid on Common Shares	(330		)	(324		)
Common Shares repurchased	(29		)	(128		)
Proceeds from issuance of long-term debt	2,175			—
Repayment of long-term debt	(300		)	(500		)
Proceeds from issuance of repurchase agreements	408			753
Repayment of repurchase agreements	(404		)	(752		)
Proceeds from share-based compensation plans	34			42
Policyholder contract deposits	118			109
Policyholder contract withdrawals	(105		)	(58		)
Net cash flows from (used for) financing activities	1,567			(858		)
Effect of foreign currency rate changes on cash and restricted cash	25			(17		)
Net increase in cash and restricted cash	1,262			72
Cash and restricted cash – beginning of period	851			1,088
Cash and restricted cash – end of period	$	2,113		$	1,160
Supplemental cash flow information
Taxes paid	$	93		$	54
Interest paid	$	82		$	75

See accompanying notes to the consolidated financial statements

6

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Unaudited)

Chubb Limited and Subsidiaries

1. General

a) Basis of presentation

Chubb Limited is a holding company incorporated in Zurich, Switzerland. Chubb Limited, through its subsidiaries, provides a broad range of insurance and reinsurance products to insureds worldwide. Chubb operates through the following business segments: North America Commercial P&C Insurance, North America Personal P&C Insurance, North America Agricultural Insurance, Overseas General Insurance, Global Reinsurance, and Life Insurance. Refer to Note 10 for additional information.

The interim unaudited consolidated financial statements, which include the accounts of Chubb Limited and its subsidiaries (collectively, Chubb, we, us, or our), have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) and, in the opinion of management, reflect all adjustments (consisting of normally recurring accruals) necessary for a fair statement of the results and financial position for such periods. All significant intercompany accounts and transactions, including internal reinsurance transactions, have been eliminated.

The results of operations and cash flows for any interim period are not necessarily indicative of the results for the full year. These consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in our 2017 Form 10-K.

b) Restricted cash

Effective January 1, 2018, we retrospectively adopted guidance on "Restricted Cash" that clarified the presentation of restricted cash on the consolidated statement of cash flows. As a result, we revised the statement of cash flows for the three months ended March 31, 2017 to include restricted cash in the beginning and ending cash balances. In addition, we reclassified $123 million of Restricted cash from Other assets to a separate line in the balance sheet as of December 31, 2017.

Restricted cash in the consolidated balance sheets represents amounts held for the benefit of third parties and is legally or contractually restricted as to withdrawal or usage. Amounts include deposits with U.S. and non-U.S. regulatory authorities, trust funds set up for the benefit of ceding companies, and amounts pledged as collateral to meet financing arrangements.

The following table provides a reconciliation of cash and restricted cash reported within the consolidated balance sheets that total to the amounts shown in the consolidated statements of cash flows:

	March 31		December 31
(in millions of U.S. dollars)	2018		2017
Cash	$	1,988	$	728
Restricted cash	125		123
Total cash and restricted cash shown in the consolidated statements of cash flows	$	2,113	$	851

c) Goodwill

During the three months ended March 31, 2018, Goodwill increased $145 million, primarily reflecting the impact of foreign exchange.

d) Accounting guidance adopted in 2018

Revenue from Contracts with Customers

In May 2014, the FASB issued an accounting standard that supersedes most existing revenue recognition guidance. The standard excludes from its scope the accounting for insurance contracts, leases, financial instruments, and certain other agreements that are governed under other GAAP guidance, but could affect the revenue recognition for certain of our claims management and risk control services. The updated guidance requires an entity to recognize revenue as performance obligations are met, in order to reflect the transfer of promised goods or services to customers in an amount that reflects the consideration the entity is entitled to receive for those goods or services. This guidance was effective for us on January 1, 2018. The adoption of this guidance did not have a material impact on our financial condition or results of operations given that the majority of our business is outside the scope of this guidance.

7

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

Financial Instruments – Recognition and Measurement of Financial Assets and Financial Liabilities

Effective January 2018, we adopted new accounting guidance on "Recognition and Measurement of Financial Assets and Financial Liabilities" on a modified-retrospective basis. The guidance requires equity investments, other than those accounted for under the equity method of accounting, to be measured at fair value with changes in fair value recognized through net income. The guidance impacts our public equities and cost-method private equities. As a result, we recorded a cumulative-effect adjustment to increase beginning Retained earnings by $416 million after tax ($454 million pre-tax), representing the unrealized appreciation on our equity investments with an offsetting adjustment to decrease Accumulated other comprehensive income. All subsequent changes in fair value of our equity investments are recognized within realized gains (losses) on the consolidated statement of operations. Prior period amounts have not been adjusted and continue to be reported in accordance with the previous accounting guidance.

Income Taxes

Effective January 2018, we adopted new accounting guidance on “Intra-Entity Transfers of Assets Other Than Inventory” on a modified-retrospective basis. Under the new guidance, we will no longer defer taxes on intra-company asset transfers and will recognize income tax expense (benefit) immediately through the income statement. As a result, we recorded a cumulative-effect adjustment to decrease beginning Retained earnings by $7 million representing the removal of the deferred tax asset for previous intra-company asset transfer transactions not yet recognized through earnings.

Income Tax Accounting Implications of the Tax Cuts and Jobs Act

The Tax Cuts and Jobs Act (2017 Tax Act) was signed into legislation in December 2017. The Securities and Exchange Commission issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act, which provides guidance for the application of the 2017 Tax Act. The income tax guidance allows for the transition impact of the 2017 Tax Act to be recorded as 1) complete with all accounting implications identified, 2) provisional based on a reasonable estimate, or 3) not recorded as no reasonable estimate was determinable.

In December 2017, we recorded a $450 million income tax transition benefit on a provisional basis under SAB 118. There were no changes to this estimate for the current period as we continue to analyze the impact of the 2017 Tax Act.

Refer to the2017 Form 10-K for information on other accounting guidance not yet adopted.

2. Investments

a) Fixed maturities

March 31, 2018	Amortized Cost		Gross Unrealized Appreciation		Gross Unrealized Depreciation			Fair Value		OTTI Recognized in AOCI
(in millions of U.S. dollars)
Available for sale
U.S. Treasury and agency	$	3,893	$	22	$	(77	)	$	3,838	$	—
Foreign	21,705		513		(187		)	22,031		—
Corporate securities	23,509		332		(274		)	23,567		(4		)
Mortgage-backed securities	16,116		53		(349		)	15,820		(1		)
States, municipalities, and political subdivisions	13,985		61		(191		)	13,855		—
	$	79,208	$	981	$	(1,078	)	$	79,111	$	(5	)
Held to maturity
U.S. Treasury and agency	$	1,037	$	9	$	(14	)	$	1,032	$	—
Foreign	1,754		17		(20		)	1,751		—
Corporate securities	3,026		26		(55		)	2,997		—
Mortgage-backed securities	2,681		11		(45		)	2,647		—
States, municipalities, and political subdivisions	5,755		18		(78		)	5,695		—
	$	14,253	$	81	$	(212	)	$	14,122	$	—

8

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

December 31, 2017	Amortized Cost		Gross Unrealized Appreciation		Gross Unrealized Depreciation			Fair Value		OTTI Recognized in AOCI
(in millions of U.S. dollars)
Available for sale
U.S. Treasury and agency	$	3,701	$	32	$	(35	)	$	3,698	$	—
Foreign	20,514		622		(106		)	21,030		(1		)
Corporate securities	23,453		638		(95		)	23,996		(4		)
Mortgage-backed securities	15,279		111		(100		)	15,290		(1		)
States, municipalities, and political subdivisions	14,888		125		(88		)	14,925		—
	$	77,835	$	1,528	$	(424	)	$	78,939	$	(6	)
Held to maturity
U.S. Treasury and agency	$	908	$	12	$	(5	)	$	915	$	—
Foreign	1,738		27		(8		)	1,757		—
Corporate securities	3,159		67		(7		)	3,219		—
Mortgage-backed securities	2,724		23		(5		)	2,742		—
States, municipalities, and political subdivisions	5,806		50		(15		)	5,841		—
	$	14,335	$	179	$	(40	)	$	14,474	$	—

As discussed in Note 2b), if a credit loss is incurred on an impaired fixed maturity, an OTTI is considered to have occurred and the portion of the impairment not related to credit losses (non-credit OTTI) is recognized in OCI. Included in the “OTTI Recognized in AOCI” columns above are the cumulative amounts of non-credit OTTI recognized in OCI adjusted for subsequent sales, maturities, and redemptions. OTTI recognized in AOCI does not include the impact of subsequent changes in fair value of the related securities. In periods subsequent to a recognition of OTTI in OCI, changes in the fair value of the related fixed maturities are reflected in Net unrealized appreciation on investments in the Consolidated statements of shareholders’ equity. For the three months ended March 31, 2018 and 2017, $4 million and nil, respectively, of net unrealized depreciation related to such securities is included in OCI. At March 31, 2018 and December 31, 2017, AOCI included cumulative net unrealized appreciation of $3 million and $7 million, respectively, related to securities remaining in the investment portfolio for which a non-credit OTTI was recognized.

Mortgage-backed securities (MBS) issued by U.S. government agencies are combined with all other to be announced mortgage-backed securities (TBAs) held (refer to Note 6 c) (iv)) and are included in the category, “Mortgage-backed securities”. Approximately 82 percent and83 percent of the total mortgage-backed securities at March 31, 2018 and December 31, 2017, respectively, are represented by investments in U.S. government agency bonds. The remainder of the mortgage exposure consists of collateralized mortgage obligations and non-government mortgage-backed securities, the majority of which provide a planned structure for principal and interest payments and carry a rating of AAA by the major credit rating agencies.

9

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

The following table presents fixed maturities by contractual maturity:

			March 31				December 31
			2018				2017
(in millions of U.S. dollars)	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Available for sale
Due in 1 year or less	$	3,735	$	3,746	$	3,164	$	3,182
Due after 1 year through 5 years	25,140		25,251		24,749		25,068
Due after 5 years through 10 years	25,243		25,097		25,388		25,704
Due after 10 years	8,974		9,197		9,255		9,695
	63,092		63,291		62,556		63,649
Mortgage-backed securities	16,116		15,820		15,279		15,290
	$	79,208	$	79,111	$	77,835	$	78,939
Held to maturity
Due in 1 year or less	$	838	$	840	$	743	$	746
Due after 1 year through 5 years	2,684		2,678		2,669		2,688
Due after 5 years through 10 years	4,713		4,635		4,744		4,756
Due after 10 years	3,337		3,322		3,455		3,542
	11,572		11,475		11,611		11,732
Mortgage-backed securities	2,681		2,647		2,724		2,742
	$	14,253	$	14,122	$	14,335	$	14,474

Expected maturities could differ from contractual maturities because borrowers may have the right to call or prepay obligations, with or without call or prepayment penalties. 

b) Net realized gains (losses)

In accordance with guidance related to the recognition and presentation of OTTI, when an impairment related to a fixed maturity has occurred, OTTI is required to be recorded in Net income if management has the intent to sell the security or it is more likely than not that we will be required to sell the security before the recovery of its amortized cost. Further, in cases where we do not intend to sell the security and it is more likely than not that we will not be required to sell the security, we must evaluate the security to determine the portion of the impairment, if any, related to credit losses. If a credit loss is incurred, an OTTI is considered to have occurred and any portion of the OTTI related to credit losses must be reflected in Net income while the portion of OTTI related to all other factors is recognized in OCI. For fixed maturities held to maturity, OTTI recognized in OCI is accreted from AOCI to the amortized cost of the fixed maturity prospectively over the remaining term of the securities.

Each quarter, securities in an unrealized loss position (impaired securities), including fixed maturities and securities lending collateralare reviewed to identify impaired securities to be specifically evaluated for a potential OTTI. Refer to the 2017 Form 10-K for information on our evaluation of OTTI for all non-fixed maturities prior to our adoption of new accounting guidance on financial instruments, effective January 1, 2018.

Evaluation of potential credit losses related to fixed maturities

We review each fixed maturity in an unrealized loss position to assess whether the security is a candidate for credit loss. Specifically, we consider credit rating, market price, and issuer-specific financial information, among other factors, to assess the likelihood of collection of all principal and interest as contractually due. Securities for which we determine that credit loss is likely are subjected to further analysis to estimate the credit loss recognized in Net income, if any. In general, credit loss recognized in Net income equals the difference between the security’s amortized cost and the net present value of its projected future cash flows discounted at the effective interest rate implicit in the debt security. All significant assumptions used in determining credit losses are subject to change as market conditions evolve.

Corporate securities

Projected cash flows for corporate securities (principally senior unsecured bonds) are driven primarily by assumptions regarding probability of default and also the timing and amount of recoveries associated with defaults. Chubb developed projected cash

10

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

flows for corporate securities using market observable data, issuer-specific information, and credit ratings. We use historical default data by Moody’s Investors Service (Moody’s) rating category to calculate a 1-in-100 year probability of default, which results in a default assumption in excess of the historical mean default rate. Consistent with management's approach, Chubb assumed a 32 percent recovery rate (the par value of a defaulted security that will be recovered) across all rating categories rather than using Moody's historical mean recovery rate of 42 percent. We believe that use of a default assumption in excess of the historical mean is conservative.

For the three months ended March 31, 2018 and 2017, credit losses recognized in Net income for corporate securities were niland $1 million, respectively.

Mortgage-backed securities

For mortgage-backed securities, credit impairment is assessed using a cash flow model that estimates the cash flows on the underlying mortgages, using the security-specific collateral and transaction structure. The model estimates cash flows from the underlying mortgage loans and distributes those cash flows to various tranches of securities, considering the transaction structure and any subordination and credit enhancements that exist in that structure. The cash flow model incorporates actual cash flows on the mortgage-backed securities through the current period and then projects the remaining cash flows using a number of assumptions, including default rates, prepayment rates, and loss severity rates (the par value of a defaulted security that will not be recovered) on foreclosed properties.

For the three months ended March 31, 2018 and 2017, there were no credit losses recognized in Net income for mortgage-backed securities.

The following table presents the components of Net realized gains (losses):

	Three Months Ended
	March 31
(in millions of U.S. dollars)	2018			2017
Fixed maturities:
OTTI on fixed maturities, gross	$	(1	)	$	(6	)
OTTI on fixed maturities recognized in OCI (pre-tax)	—			—
OTTI on fixed maturities, net	(1		)	(6		)
Gross realized gains excluding OTTI	66			34
Gross realized losses excluding OTTI	(88		)	(40		)
Total fixed maturities	(23		)	(12		)
Equity securities:
OTTI on equity securities	—			(5		)
Gross realized gains excluding OTTI	10			9
Gross realized losses excluding OTTI	(21		)	—
Total equity securities	(11		)	4
OTTI on other investments	—			(8		)
Other investments	29			—
Foreign exchange losses	(77		)	(19		)
Investment and embedded derivative instruments	17			6
Fair value adjustments on insurance derivative	38			93
S&P put options and futures	22			(74		)
Other derivative instruments	2			2
Other	1			1
Net realized gains (losses)	$	(2	)	$	(7	)

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

The following table presents a roll-forward of pre-tax credit losses related to fixed maturities for which a portion of OTTI was recognized in OCI:

	Three Months Ended
	March 31
(in millions of U.S. dollars)	2018			2017
Balance of credit losses related to securities still held – beginning of period	$	22		$	35
Additions where no OTTI was previously recorded	—			—
Additions where an OTTI was previously recorded	—			1
Reductions for securities sold during the period	(7		)	(4		)
Balance of credit losses related to securities still held – end of period	$	15		$	32

c) Equity securities and Other investments

Effective January 1, 2018, we adopted new accounting guidance that requires any changes in fair value of equity securities and other investments that are accounted for under the cost-method to be recognized immediately in realized gains and losses in net income. As a result, beginning on January 1, 2018, realized gains and losses from these investments include both sales of securities and unrealized gains and losses as follows:

	Three Months Ended
	March 31, 2018
(in millions of U.S. dollars)	Equity Securities			Other Investments
Net gains (losses) recognized during the period	$	(11	)	$	29
Less: Net gains (losses) recognized from sales of securities	10			—
Unrealized gains (losses) recognized for securities still held at reporting date	$	(21	)	$	29

At December 31, 2017, the cost, gross unrealized appreciation, gross unrealized depreciation, and fair value of equity securities was $737 million, $212 million, $12 million, and $937 million, respectively. At December 31, 2017, the net unrealized appreciation (depreciation) was recorded within accumulated other comprehensive income on the balance sheet.

d) Gross unrealized loss

At March 31, 2018, there were 15,699 fixed maturities out of a total of 31,179 fixed maturities in an unrealized loss position. The largest single unrealized loss in the fixed maturities was $10 million. Fixed maturities in an unrealized loss position at March 31, 2018, comprised both investment grade and below investment grade securities for which fair value declined primarily due to widening credit spreads since the date of purchase.

The following tables present, for all securities in an unrealized loss position (including securities on loan), the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position:

	0 – 12 Months					Over 12 Months					Total
March 31, 2018	Fair Value		Gross Unrealized Loss			Fair Value		Gross Unrealized Loss			Fair Value		Gross Unrealized Loss
(in millions of U.S. dollars)
U.S. Treasury and agency	$	2,869	$	(55	)	$	1,314	$	(36	)	$	4,183	$	(91	)
Foreign	8,715		(155		)	1,643		(52		)	10,358		(207		)
Corporate securities	12,355		(260		)	1,501		(69		)	13,856		(329		)
Mortgage-backed securities	12,313		(257		)	3,033		(137		)	15,346		(394		)
States, municipalities, and political subdivisions	15,030		(218		)	1,343		(51		)	16,373		(269		)
Total fixed maturities	$	51,282	$	(945	)	$	8,834	$	(345	)	$	60,116	$	(1,290	)

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

	0 – 12 Months					Over 12 Months					Total
December 31, 2017	Fair Value		Gross Unrealized Loss			Fair Value		Gross Unrealized Loss			Fair Value		Gross Unrealized Loss
(in millions of U.S. dollars)
U.S. Treasury and agency	$	2,172	$	(14	)	$	1,249	$	(26	)	$	3,421	$	(40	)
Foreign	5,657		(65		)	1,693		(49		)	7,350		(114		)
Corporate securities	5,210		(56		)	1,332		(46		)	6,542		(102		)
Mortgage-backed securities	6,194		(31		)	3,209		(74		)	9,403		(105		)
States, municipalities, and political subdivisions	9,259		(71		)	1,402		(32		)	10,661		(103		)
Total fixed maturities	28,492		(237		)	8,885		(227		)	37,377		(464		)
Equity securities	115		(12		)	—		—			115		(12		)
Other investments	78		(8		)	—		—			78		(8		)
Total	$	28,685	$	(257	)	$	8,885	$	(227	)	$	37,570	$	(484	)

e) Restricted assets

Chubb is required to maintain assets on deposit with various regulatory authorities to support its insurance and reinsurance operations. These requirements are generally promulgated in the statutory regulations of the individual jurisdictions. The assets on deposit are available to settle insurance and reinsurance liabilities. Chubb is also required to restrict assets pledged under repurchase agreements, which represent Chubb's agreement to sell securities and repurchase them at a future date for a predetermined price. We also use trust funds in certain large reinsurance transactions where the trust funds are set up for the benefit of the ceding companies and generally take the place of letter of credit (LOC) requirements. We also have investments in segregated portfolios primarily to provide collateral or guarantees for LOC and derivative transactions. Included in restricted assets at March 31, 2018 and December 31, 2017 are investments, primarily fixed maturities, totaling $23.6 billion and $23.3 billion, respectively, and cash of $125 million and $123 million, respectively.

The following table presents the components of restricted assets:

	March 31		December 31
(in millions of U.S. dollars)	2018		2017
Trust funds	$	17,029	$	17,011
Deposits with U.S. regulatory authorities	2,463		2,345
Deposits with non-U.S. regulatory authorities	2,290		2,250
Assets pledged under repurchase agreements	1,460		1,434
Other pledged assets	433		414
	$	23,675	$	23,454

3. Fair value measurements

a) Fair value hierarchy

Fair value of financial assets and financial liabilities is estimated based on the framework established in the fair value accounting guidance. The guidance defines fair value as the price to sell an asset or transfer a liability (an exit price) in an orderly transaction between market participants and establishes a three-level valuation hierarchy based on the reliability of the inputs. The fair value hierarchy gives the highest priority to quoted prices in active markets and the lowest priority to unobservable data.

The three levels of the hierarchy are as follows:

• Level 1 – Unadjusted quoted prices for identical assets or liabilities in active markets;

• Level 2 – Includes, among other items, inputs other than quoted prices that are observable for the asset or liability such as

interest rates and yield curves, quoted prices for similar assets and liabilities in active markets, and quoted prices for identical or similar assets and liabilities in markets that are not active; and

• Level 3 – Inputs that are unobservable and reflect management’s judgments about assumptions that market participants

would use in pricing an asset or liability.

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Chubb Limited and Subsidiaries

We categorize financial instruments within the valuation hierarchy at the balance sheet date based upon the lowest level of inputs that are significant to the fair value measurement. Accordingly, transfers between levels within the valuation hierarchy occur when there are significant changes to the inputs, such as increases or decreases in market activity, changes to the availability of current prices, changes to the transparency to underlying inputs, and whether there are significant variances in quoted prices. Transfers in and/or out of any level are assumed to occur at the end of the period.

We use pricing services to obtain fair value measurements for the majority of our investment securities. Based on management’s understanding of the methodologies used, these pricing services only produce an estimate of fair value if there is observable market information that would allow them to make a fair value estimate. Based on our understanding of the market inputs used by the pricing services, all applicable investments have been valued in accordance with GAAP. We do not adjust prices obtained from pricing services. The following is a description of the valuation techniques and inputs used to determine fair values for financial instruments carried at fair value, as well as the general classification of such financial instruments pursuant to the valuation hierarchy.

Fixed maturities

We use pricing services to estimate fair value measurements for the majority of our fixed maturities. The pricing services use market quotations for fixed maturities that have quoted prices in active markets; such securities are classified within Level 1. For fixed maturities other than U.S. Treasury securities that generally do not trade on a daily basis, the pricing services prepare estimates of fair value measurements using their pricing applications, which include available relevant market information, benchmark curves, benchmarking of like securities, sector groupings, and matrix pricing. Additional valuation factors that can be taken into account are nominal spreads, dollar basis, and liquidity adjustments. The pricing services evaluate each asset class based on relevant market and credit information, perceived market movements, and sector news. The market inputs used in the pricing evaluation, listed in the approximate order of priority include: benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, reference data, and industry and economic events. The extent of the use of each input is dependent on the asset class and the market conditions. Given the asset class, the priority of the use of inputs may change, or some market inputs may not be relevant. Additionally, fixed maturities valuation is more subjective when markets are less liquid due to the lack of market based inputs (i.e., stale pricing), which may increase the potential that an investment's estimated fair value is not reflective of the price at which an actual transaction would occur. The overwhelming majority of fixed maturities are classified within Level 2 because the most significant inputs used in the pricing techniques are observable. For a small number of fixed maturities, we obtain a single broker quote (typically from a market maker). Due to the disclaimers on the quotes that indicate that the price is indicative only, we include these fair value estimates in Level 3. 

Equity securities

Equity securities with active markets are classified within Level 1 as fair values are based on quoted market prices. For equity securities in markets which are less active, fair values are based on market valuations and are classified within Level 2. Equity securities for which pricing is unobservable are classified within Level 3.

Short-term investments

Short-term investments, which comprise securities due to mature within one year of the date of purchase that are traded in active markets, are classified within Level 1 as fair values are based on quoted market prices. Securities such as commercial paper and discount notes are classified within Level 2 because these securities are typically not actively traded due to their approaching maturity and, as such, their cost approximates fair value. Short-term investments for which pricing is unobservable are classified within Level 3.

Other investments

Fair values for the majority of Other investments including investments in partially-owned investment companies, investment funds, and limited partnerships are based on their respective net asset values or equivalent (NAV) and are excluded from the fair value hierarchy table below. Certain of our long-duration contracts are supported by assets that do not qualify for separate account reporting under GAAP. These assets comprise mutual funds classified within Level 1 in the valuation hierarchy on the same basis as other equity securities traded in active markets. Other investments also include equity securities classified within Level 1, and fixed maturities, classified within Level 2, held in rabbi trusts maintained by Chubb for deferred compensation plans and are classified within the valuation hierarchy on the same basis as other equity securities and fixed maturities. Other investments for which pricing is unobservable are classified within Level 3.

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Chubb Limited and Subsidiaries

Securities lending collateral

The underlying assets included in Securities lending collateral in the Consolidated balance sheets are fixed maturities which are classified in the valuation hierarchy on the same basis as other fixed maturities. Excluded from the valuation hierarchy is the corresponding liability related to Chubb’s obligation to return the collateral plus interest as it is reported at contract value and not fair value in the Consolidated balance sheets.

Investment derivative instruments

Actively traded investment derivative instruments, including futures, options, and forward contracts are classified within Level 1 as fair values are based on quoted market prices. The fair value of cross-currency swaps is based on market valuations and is classified within Level 2. Investment derivative instruments are recorded in either Other assets or Accounts payable, accrued expenses, and other liabilities in the Consolidated balance sheets.

Other derivative instruments

We generally maintain positions in other derivative instruments including exchange-traded equity futures contracts and option contracts designed to limit exposure to a severe equity market decline, which would cause an increase in expected claims and, therefore, an increase in reserves for our guaranteed minimum death benefits (GMDB) and guaranteed living benefits (GLB) reinsurance business. Our position in exchange-traded equity futures contracts is classified within Level 1. The fair value of the majority of the remaining positions in other derivative instruments is based on significant observable inputs including equity security and interest rate indices. Accordingly, these are classified within Level 2. Other derivative instruments based on unobservable inputs are classified within Level 3. Other derivative instruments are recorded in either Other assets or Accounts payable, accrued expenses, and other liabilities in the Consolidated balance sheets.

Separate account assets

Separate account assets represent segregated funds where investment risks are borne by the customers, except to the extent of certain guarantees made by Chubb. Separate account assets comprise mutual funds classified within Level 1 in the valuation hierarchy on the same basis as other equity securities traded in active markets. Separate account assets also include fixed maturities classified within Level 2 because the most significant inputs used in the pricing techniques are observable. Excluded from the valuation hierarchy are the corresponding liabilities as they are reported at contract value and not fair value in the Consolidated balance sheets. Separate account assets are recorded in Other assets in the Consolidated balance sheets.

Guaranteed living benefits

The GLB arises from life reinsurance programs covering living benefit guarantees whereby we assume the risk of guaranteed minimum income benefits (GMIB) and guaranteed minimum accumulation benefits (GMAB) associated with variable annuity contracts. GLB’s are recorded in Accounts payable, accrued expenses, and other liabilities and Future policy benefits in the Consolidated balance sheets. For GLB reinsurance, Chubb estimates fair value using an internal valuation model which includes current market information and estimates of policyholder behavior. All of the treaties contain claim limits, which are factored into the valuation model. The fair value depends on a number of factors, including interest rates, equity markets, credit risk, current account value, market volatility, expected annuitization rates and other policyholder behavior, and changes in policyholder mortality.

The most significant policyholder behavior assumptions include lapse rates and the GMIB annuitization rates. Assumptions regarding lapse rates and GMIB annuitization rates differ by treaty, but the underlying methodologies to determine rates applied to each treaty are comparable.

A lapse rate is the percentage of in-force policies surrendered in a given calendar year. All else equal, as lapse rates increase, ultimate claim payments will decrease.

The GMIB annuitization rate is the percentage of policies for which the policyholder will elect to annuitize using the guaranteed benefit provided under the GMIB. All else equal, as GMIB annuitization rates increase, ultimate claim payments will increase, subject to treaty claim limits.

The effect of changes in key market factors on assumed lapse and annuitization rates reflect emerging trends using data available from cedants. For treaties with limited experience, rates are established in line with data received from other ceding companies adjusted, as appropriate, with industry estimates. The model and related assumptions are regularly re-evaluated by management and enhanced, as appropriate, based upon additional experience obtained related to policyholder behavior and availability of updated information such as market conditions, market participant assumptions, and demographics of in-force annuities. Because of the significant use of unobservable inputs including policyholder behavior, GLB reinsurance is classified

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Chubb Limited and Subsidiaries

within Level 3. For the three months ended March 31, 2018 and 2017, no material technical refinements were made to the model. For detailed information on our lapse and annuitization rate assumptions, refer to Note 4 to the Consolidated Financial Statements of our 2017 Form 10-K.

Financial instruments measured at fair value on a recurring basis, by valuation hierarchy

March 31, 2018	Level 1		Level 2		Level 3		Total
(in millions of U.S. dollars)
Assets:
Fixed maturities available for sale
U.S. Treasury and agency	$	3,094	$	744	$	—	$	3,838
Foreign	—		21,855		176		22,031
Corporate securities	—		22,494		1,073		23,567
Mortgage-backed securities	—		15,737		83		15,820
States, municipalities, and political subdivisions	—		13,855		—		13,855
	3,094		74,685		1,332		79,111
Equity securities	884		—		64		948
Short-term investments	1,735		1,127		12		2,874
Other investments (1)	451		318		270		1,039
Securities lending collateral	—		2,039		—		2,039
Investment derivative instruments	25		—		—		25
Other derivative instruments	78		—		—		78
Separate account assets	2,774		100		—		2,874
Total assets measured at fair value (1)	$	9,041	$	78,269	$	1,678	$	88,988
Liabilities:
Investment derivative instruments	$	29	$	—	$	—	$	29
Other derivative instruments	—		—		2		2
GLB (2)	—		—		167		167
Total liabilities measured at fair value	$	29	$	—	$	169	$	198

⁽¹⁾  Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $3,866 million and other investments of $14 million at March 31, 2018 measured using NAV as a practical expedient.

⁽²⁾  Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets.

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Chubb Limited and Subsidiaries

December 31, 2017	Level 1		Level 2		Level 3		Total
(in millions of U.S. dollars)
Assets:
Fixed maturities available for sale
U.S. Treasury and agency	$	3,129	$	569	$	—	$	3,698
Foreign	—		20,937		93		21,030
Corporate securities	—		22,959		1,037		23,996
Mortgage-backed securities	—		15,212		78		15,290
States, municipalities, and political subdivisions	—		14,925		—		14,925
	3,129		74,602		1,208		78,939
Equity securities	893		—		44		937
Short-term investments	2,309		1,252		—		3,561
Other investments (1)	466		305		263		1,034
Securities lending collateral	—		1,737		—		1,737
Investment derivative instruments	18		—		—		18
Other derivative instruments	1		—		—		1
Separate account assets	2,635		99		—		2,734
Total assets measured at fair value (1)	$	9,451	$	77,995	$	1,515	$	88,961
Liabilities:
Investment derivative instruments	$	30	$	—	$	—	$	30
Other derivative instruments	21		—		2		23
GLB (2)	—		—		204		204
Total liabilities measured at fair value	$	51	$	—	$	206	$	257

⁽¹⁾  Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $3,623 million and other investments of $15 million at December 31, 2017 measured using NAV as a practical expedient.

⁽²⁾  Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets.

There were no transfers of financial instruments between Level 1 and Level 2 for both the three months ended March 31, 2018 and 2017.

Fair value of alternative investments

Alternative investments include investment funds, limited partnerships, and partially-owned investment companies measured at fair value using NAV as a practical expedient. The following table presents, by investment category, the expected liquidation period, fair value, and maximum future funding commitments of alternative investments:

				March 31				December 31
	Expected Liquidation Period of Underlying Assets			2018				2017
(in millions of U.S. dollars)		Fair Value		Maximum Future Funding Commitments		Fair Value		Maximum Future Funding Commitments
Financial	5 to 9 Years	$	538	$	327	$	540	$	330
Real Assets	3 to 7 Years	656		210		651		114
Distressed	3 to 7 Years	295		131		289		141
Private Credit	3 to 7 Years	173		320		187		327
Traditional	3 to 15 Years	1,901		2,858		1,656		3,149
Vintage	1 to 2 Years	27		—		30		—
Investment funds	Not Applicable	276		—		270		—
		$	3,866	$	3,846	$	3,623	$	4,061

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Chubb Limited and Subsidiaries

Included in all categories in the above table, except for Investment funds, are investments for which Chubb will never have the contractual option to redeem but receives distributions based on the liquidation of the underlying assets. Further, for all categories except for Investment funds, Chubb does not have the ability to sell or transfer the investments without the consent from the general partner of individual funds.

Investment Category:	Consists of investments in private equity funds:
Financial	targeting financial services companies such as financial institutions and insurance services worldwide
Real Assets	targeting investments related to hard physical assets such as real estate, infrastructure and natural resources
Distressed	targeting distressed corporate debt/credit and equity opportunities in the U.S.
Private Credit	targeting privately originated corporate debt investments including senior secured loans and subordinated bonds
Traditional	employing traditional private equity investment strategies such as buyout and growth equity globally
Vintage	made before 2002 or where the funds’ commitment periods had already expired

Investment funds

Chubb’s investment funds employ various investment strategies such as long/short equity and arbitrage/distressed. Included in this category are investments for which Chubb has the option to redeem at agreed upon value as described in each investment fund’s subscription agreement. Depending on the terms of the various subscription agreements, investment fund investments may be redeemed monthly, quarterly, semi-annually, or annually. If Chubb wishes to redeem an investment fund investment, it must first determine if the investment fund is still in a lock-up period (a time when Chubb cannot redeem its investment so that the investment fund manager has time to build the portfolio). If the investment fund is no longer in its lock-up period, Chubb must then notify the investment fund manager of its intention to redeem by the notification date prescribed by the subscription agreement. Subsequent to notification, the investment fund can redeem Chubb’s investment within several months of the notification. Notice periods for redemption of the investment funds range between 5 and 120 days. Chubb can redeem its investment funds without consent from the investment fund managers.

Level 3 financial instruments

The fair values of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) consist of various inputs and assumptions that management makes when determining fair value. Management analyzes changes in fair value measurements classified within Level 3 by comparing pricing and returns of our investments to benchmarks, including month-over-month movements, investment credit spreads, interest rate movements, and credit quality of securities.

The following table presents the significant unobservable inputs used in the Level 3 liability valuations. Excluded from the table below are inputs used to determine the fair value of Level 3 assets which are based on single broker quotes and contain no quantitative unobservable inputs developed by management.

(in millions of U.S. dollars, except for percentages)	Fair Value				Valuation Technique	Significant Unobservable Inputs	Ranges
	March 31, 2018		December 31, 2017
GLB (1)	$	167	$	204	Actuarial model	Lapse rate	3% – 33%
						Annuitization rate	0% – 100%

⁽¹⁾  Discussion of the most significant inputs used in the fair value measurement of GLB and the sensitivity of those assumptions is included within Note 3 a) Guaranteed living benefits.

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Chubb Limited and Subsidiaries

The following tables present a reconciliation of the beginning and ending balances of financial instruments measured at fair value using significant unobservable inputs (Level 3):

	Assets																Liabilities
Three Months Ended	Available-for-Sale Debt Securities								Equity securities		Short-term investments			Other investments			Other derivative instruments		GLB (2)
March 31, 2018	Foreign			Corporate securities (1)			MBS
(in millions of U.S. dollars)
Balance – beginning of period	$	93		$	1,037		$	78	$	44	$	—		$	263		$	2	$	204
Transfers into Level 3	7			—			1		—		5			—			—		—
Transfers out of Level 3	—			(10		)	—		—		—			—			—		—
Change in Net Unrealized Gains (Losses) included in OCI, including Foreign Exchange	9			(3		)	—		1		—			2			—		—
Net Realized Gains/Losses	—			—			—		2		—			—			—		(37		)
Purchases	87			139			4		17		8			14			—		—
Sales	(19		)	(51		)	—		—		—			—			—		—
Settlements	(1		)	(39		)	—		—		(1		)	(9		)	—		—
Balance – end of period	$	176		$	1,073		$	83	$	64	$	12		$	270		$	2	$	167
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date	$	—		$	—		$	—	$	—	$	—		$	—		$	—	$	(37	)

⁽¹⁾  Purchases in Level 3 primarily consist of privately-placed fixed income securities.

⁽²⁾  Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $529 million at March 31, 2018, and $550 million at December 31, 2017, which includes a fair value derivative adjustment of $167 million and $204 million, respectively.

	Assets																				Liabilities
Three Months Ended	Available-for-Sale Debt Securities									Equity securities		Short-term investments			Other investments			Other derivative instruments			GLB (1)
March 31, 2017	Foreign			Corporate securities			MBS
(in millions of U.S. dollars)
Balance – beginning of period	$	74		$	681		$	45		$	41	$	25		$	225		$	13		$	559
Transfers into Level 3	—			29			—			—		—			—			—			—
Transfers out of Level 3	—			(54		)	—			—		—			—			—			—
Change in Net Unrealized Gains (Losses) included in OCI	(1		)	(8		)	—			—		—			4			—			—
Net Realized Gains/Losses	(1		)	(1		)	—			—		—			—			(2		)	(93		)
Purchases	14			156			1			—		7			8			—			—
Sales	(3		)	(27		)	(1		)	—		—			—			—			—
Settlements	(3		)	(39		)	—			—		(11		)	(4		)	—			—
Balance – end of period	$	80		$	737		$	45		$	41	$	21		$	233		$	11		$	466
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date	$	—		$	—		$	—		$	—	$	—		$	—		$	(2	)	$	(93	)

⁽¹⁾  Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $774 million at March 31, 2017, and $853 million at December 31, 2016, which includes a fair value derivative adjustment of $466 million and $559 million, respectively.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

b) Financial instruments disclosed, but not measured, at fair value

Chubb uses various financial instruments in the normal course of its business. Our insurance contracts are excluded from fair value of financial instruments accounting guidance, and therefore, are not included in the amounts discussed below.

The carrying values of cash, other assets, other liabilities, and other financial instruments not included below approximated their fair values.

Refer to the 2017 Form 10-K for information on the fair value methods and assumptions for investments in partially-owned insurance companies, short-term and long-term debt, repurchase agreements, and trust-preferred securities.

The following tables present fair value, by valuation hierarchy, and carrying value of the financial instruments not measured at fair value:

March 31, 2018	Fair Value								Carrying Value
(in millions of U.S. dollars)	Level 1		Level 2		Level 3		Total
Assets:
Fixed maturities held to maturity
U.S. Treasury and agency	$	977	$	55	$	—	$	1,032	$	1,037
Foreign	—		1,751		—		1,751		1,754
Corporate securities	—		2,964		33		2,997		3,026
Mortgage-backed securities	—		2,647		—		2,647		2,681
States, municipalities, and political subdivisions	—		5,695		—		5,695		5,755
Total assets	$	977	$	13,112	$	33	$	14,122	$	14,253
Liabilities:
Repurchase agreements	$	—	$	1,412	$	—	$	1,412	$	1,412
Short-term debt	—		1,704		—		1,704		1,669
Long-term debt	—		13,023		—		13,023		12,786
Trust preferred securities	—		466		—		466		308
Total liabilities	$	—	$	16,605	$	—	$	16,605	$	16,175

December 31, 2017	Fair Value								Carrying Value
(in millions of U.S. dollars)	Level 1		Level 2		Level 3		Total
Assets:
Fixed maturities held to maturity
U.S. Treasury and agency	$	857	$	58	$	—	$	915	$	908
Foreign	—		1,757		—		1,757		1,738
Corporate securities	—		3,184		35		3,219		3,159
Mortgage-backed securities	—		2,742		—		2,742		2,724
States, municipalities, and political subdivisions	—		5,841		—		5,841		5,806
Total assets	$	857	$	13,582	$	35	$	14,474	$	14,335
Liabilities:
Repurchase agreements	$	—	$	1,408	$	—	$	1,408	$	1,408
Short-term debt	—		1,013		—		1,013		1,013
Long-term debt	—		12,332		—		12,332		11,556
Trust preferred securities	—		468		—		468		308
Total liabilities	$	—	$	15,221	$	—	$	15,221	$	14,285

20

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

4. Unpaid losses and loss expenses

The following table presents a reconciliation of beginning and ending Unpaid losses and loss expenses:

	Three Months Ended March 31
(in millions of U.S. dollars)	2018			2017
Gross unpaid losses and loss expenses – beginning of period	$	63,179		$	60,540
Reinsurance recoverable on unpaid losses - beginning of period (1)	(14,014		)	(12,708		)
Net unpaid losses and loss expenses – beginning of period	49,165			47,832
Net losses and loss expenses incurred in respect of losses occurring in:
Current year	4,358			4,078
Prior years (2)	(256		)	(289		)
Total	4,102			3,789
Net losses and loss expenses paid in respect of losses occurring in:
Current year	809			798
Prior years	3,433			3,109
Total	4,242			3,907
Foreign currency revaluation and other	292			54
Net unpaid losses and loss expenses – end of period	49,317			47,768
Reinsurance recoverable on unpaid losses (3)	13,822			12,811
Gross unpaid losses and loss expenses – end of period	$	63,139		$	60,579

⁽¹⁾  Net of provision for uncollectible reinsurance of $321 million and $300 million at December 31, 2017 and 2016, respectively.

⁽²⁾  Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments, and earned premiums totaling $47 million and $58 million for the three months ended March 31, 2018 and 2017, respectively.

⁽³⁾  Net of provision for uncollectible reinsurance of $320 million and $334 million at March 31, 2018 and 2017, respectively.

The increase in net unpaid losses and loss expenses from December 31, 2017 reflects the impact of catastrophic events in the quarter and foreign exchange movement, offset by favorable prior period development and catastrophe payments related to the 2017 catastrophic events.

Prior Period Development

Prior period development arises from changes to loss estimates recognized in the current year that relate to loss events that occurred in previous calendar years and excludes the effect of losses from the development of earned premium from previous accident years. Significant prior period movements by segment, principally driven by reserve reviews completed during each respective period, are discussed in more detail below. The remaining net development for long-tail lines and short-tail business for each segment and Corporate comprises numerous favorable and adverse movements across a number of lines and accident years, none of which is significant individually or in the aggregate.

Long-tail lines include lines such as workers' compensation, general liability, and professional liability; while short-tail lines include lines such as most property lines, energy, personal accident, and agriculture. During the third quarter of 2017, we determined that the loss development classification for certain businesses, previously grouped within the short-tail column in the table below, would be more appropriately grouped within the long-tail column to better align with the classification of these businesses within our loss development triangles in our Form 10-K. We also determined that the loss development for certain other businesses should be reclassified from long-tail to short-tail. We updated the 2017 North America Commercial P&C Insurance segment amounts below to conform to the current period presentation and reclassified $5 million of net favorable development into short-tail from long-tail. These changes to the previously disclosed amounts have no impact to our financial condition and results of operations.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

	Three Months Ended March 31
(in millions of U.S. dollars)	Long-tail			Short-tail			Total
2018
North America Commercial P&C Insurance	$	8		$	(109	)	$	(101	)
North America Personal P&C Insurance	—			(6		)	(6		)
North America Agricultural Insurance	—			(76		)	(76		)
Overseas General Insurance	—			(22		)	(22		)
Global Reinsurance	—			(14		)	(14		)
Corporate	10			—			10
Total	$	18		$	(227	)	$	(209	)
2017
North America Commercial P&C Insurance	$	(94	)	$	(85	)	$	(179	)
North America Personal P&C Insurance	—			(3		)	(3		)
North America Agricultural Insurance	—			(79		)	(79		)
Overseas General Insurance	32			(20		)	12
Global Reinsurance	8			—			8
Corporate	10			—			10
Total	$	(44	)	$	(187	)	$	(231	)

North America Commercial P&C Insurance

2018

For the three months ended March 31, 2018, net favorable PPD was $101 million, which was the net result of several underlying favorable and adverse movements, and was driven by the following principal changes:

• Net adverse development of $8 million in long-tail business, primarily from:

• Net favorable development of $29 million in commercial excess and umbrella portfolios, driven by the 2012 and prior accident years where the cumulative emergence over time has been less than expected overall and an increase in weighting towards experience-based methods, partly offset by several large settlements; additionally there was adverse claim activity in the 2014 and 2015 accident years which led to reserve strengthening in those years;

• Net favorable development of $3 million on several lines of business due to favorable claim development on the 2017 natural catastrophes; and

• Net adverse development of $40 million, mainly in 2015, 2016 and some older accident years, partially offset by favorable development in other periods, particularly in the 2014 accident year. This net adverse development consisted of several underlying favorable and adverse movements by portfolio, principally including $16 million of adverse development in wholesale general liability lines.

• Net favorable development of $109 million in short-tail business, primarily from:

• Net favorable development of $75 million in commercial property and marine businesses due to favorable claim development on the 2017 natural catastrophes; and

• Net favorable development of $34 million, principally including $19 million in surety business. The remainder was due to several underlying favorable and adverse movements, none of which were significant individually or in the aggregate.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

2017

For the three months ended March 31, 2017, net favorable PPD was $179 million, which was the net result of several underlying favorable and adverse movements, and was driven by the following principal changes:

• Net favorable development of $94 million in long-tail business, primarily from:

• Net favorable development of $74 million in our commercial excess and umbrella portfolios, primarily in accident years 2010 and prior, driven by lower than expected reported loss activity, and an increase in weighting towards experience-based methods; and

• Net favorable development of $32 million in our professional Errors and Omissions (E&O) portfolios, primarily in the 2011 through 2013 accident years, arising from lower than expected reported loss activity, partially offset by claim-specific adverse development.

• Net favorable development of $85 million in short-tail business, primarily from:

• Net favorable development of $45 million in our surety business, primarily due to lower than expected claims severity in the 2015 accident year; and

• Net favorable development of $24 million in accident & health (A&H) lines, primarily due to lower than expected loss emergence in the 2015 and 2016 accident years.

North America Personal P&C Insurance

2018

For the three months ended March 31, 2018, net favorable PPD was $6 million and was driven by claim development on the 2017 natural catastrophes.

2017

For the three months ended March 31, 2017, net favorable PPD was $3 million, which was the net result of several underlying favorable and adverse movements, none of which were significant individually or in the aggregate.

North America Agricultural Insurance

For the three months ended March 31, 2018 and 2017, net favorable PPD was $76 million and $79 million, respectively. Actual claim development relates to our Multiple Peril Crop Insurance (MPCI) business and is favorable due to better than expected crop yield results in certain states at the prior year-end period (i.e., 2018 results based on crop yield results at year-end 2017).

Overseas General Insurance

2018

For the three months ended March 31, 2018, net favorable PPD was $22 million, which was primarily driven by $12 million of claim development on the 2017 natural catastrophes.

2017

For the three months ended March 31, 2017, net adverse PPD was $12 million, which was the net result of several underlying favorable and adverse movements, and was driven by the following principal changes:

• Adverse development of $32 million in long-tail business, in our casualty lines, driven by a change in the discount rate in the U.K. (Ogden rate) impacting the 2016 and prior accident years.

• Net favorable development of $20 million in short-tail business, which was the net result of several underlying favorable and adverse movements, none of which were significant individually or in the aggregate.

Global Reinsurance

2018

For the three months ended March 31, 2018, net favorable PPD was $14 million, which was primarily driven by $10 million of claim development on the 2017 natural catastrophes.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

2017

For the three months ended March 31, 2017, net adverse PPD was $8 million, which was primarily due to adverse development of $9 million in long-tail motor and excess liability lines, driven by a change in the discount rate in the U.K. (Ogden rate) impacting the 2015 and prior accident years.

Corporate

For the three months ended March 31, 2018 and 2017, adverse development was $10 million for both periods, related to unallocated loss adjustment expenses due to run-off operating expenses paid and incurred.

5. Debt

In March 2018, Chubb INA Holdings Inc. (Chubb INA) issued €900 million ($1.1 billion based on the foreign exchange rate at the date of issuance) of 1.55 percent Euro denominated senior notes due March 2028 and €900 million ($1.1 billion based on the foreign exchange rate at the date of issuance) of 2.5 percent Euro denominated senior notes due March 2038. These senior notes are redeemable at any time at Chubb INA's option subject to a “make-whole” premium (the present value of the remaining principal and interest discounted at the applicable comparable government bond rate plus 0.15 percent for the senior notes due 2028 and 0.25 percent for the senior notes due 2038). The notes are also redeemable at par plus accrued and unpaid interest in the event of certain changes in tax law. These notes do not have the benefit of any sinking fund. These senior unsecured notes are guaranteed on a senior basis by Chubb and they rank equally with all of Chubb's other senior obligations. They also contain customary limitations on lien provisions as well as customary events of default provisions which, if breached, could result in the accelerated maturity of such senior debt.

Chubb INA's $300 million of 5.8 percent senior notes due March 2018 were paid upon maturity.

In March 2018, we reclassified $964 million of the 6.375 percent unsecured junior subordinated capital securities ($1.0 billion par value with the final maturity date of March 2067) from long-term to short-term debt in the Consolidated balance sheets given our intention to redeem these securities on April 6, 2018, prior to the maturity date. Subsequently, the $1.0 billion capital securities were redeemed on April 6, 2018.

6. Commitments, contingencies, and guarantees

a) Derivative instruments

Foreign currency management

As a global company, Chubb entities transact business in multiple currencies. Our policy is to generally match assets, liabilities, and required capital for each individual jurisdiction in local currency, which would include the use of derivatives discussed below. We do not hedge our net asset non-U.S. dollar capital positions; however, we do consider economic hedging for planned cross border transactions.

Derivative instruments employed

Chubb maintains positions in derivative instruments such as futures, options, swaps, and foreign currency forward contracts for which the primary purposes are to manage duration and foreign currency exposure, yield enhancement, or to obtain an exposure to a particular financial market. Chubb also maintains positions in convertible securities that contain embedded derivatives. Investment derivative instruments are recorded in either Other assets (OA) or Accounts payable, accrued expenses, and other liabilities (AP), convertible bonds are recorded in Fixed maturities available for sale (FM AFS), and convertible equity securities are recorded in Equity securities (ES) in the Consolidated balance sheets. These are the most numerous and frequent derivative transactions. In addition, Chubb from time to time purchases to be announced mortgage-backed securities (TBAs) as part of its investing activities.

Under reinsurance programs covering GLBs, Chubb assumes the risk of GLBs, including GMIB and GMAB, associated with variable annuity contracts. The GMIB risk is triggered if, at the time the contract holder elects to convert the accumulated account value to a periodic payment stream (annuitize), the accumulated account value is not sufficient to provide a guaranteed minimum level of monthly income. The GMAB risk is triggered if, at contract maturity, the contract holder’s account value is less than a guaranteed minimum value. The GLB reinsurance product meets the definition of a derivative instrument. Benefit reserves in respect of GLBs are classified as Future policy benefits (FPB) while the fair value derivative adjustment is classified within AP. Chubb also generally maintains positions in exchange-traded equity futures contracts on equity market indices to limit equity exposure in the GMDB and GLB blocks of business.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

All derivative instruments are carried at fair value with changes in fair value recorded in Net realized gains (losses) in the Consolidated statements of operations. None of the derivative instruments are designated as hedges for accounting purposes.

The following table presents the balance sheet locations, fair values of derivative instruments in an asset or (liability) position, and notional values/payment provisions of our derivative instruments:

				March 31, 2018							December 31, 2017
	Consolidated Balance Sheet Location	Fair Value					Notional Value/ Payment Provision		Fair Value					Notional Value/ Payment Provision
(in millions of U.S. dollars)		Derivative Asset		Derivative (Liability)					Derivative Asset		Derivative (Liability)
Investment and embedded derivative instruments:
Foreign currency forward contracts	OA / (AP)	$	19	$	(17	)	$	2,125	$	14	$	(27	)	$	2,064
Cross-currency swaps	OA / (AP)	—		—			45		—		—			45
Options/Futures contracts on notes and bonds	OA / (AP)	6		(12		)	1,093		4		(3		)	1,007
Convertible securities (1)	FM AFS / ES	7		—			8		5		—			6
		$	32	$	(29	)	$	3,271	$	23	$	(30	)	$	3,122
Other derivative instruments:
Futures contracts on equities(2)	OA / (AP)	$	71	$	—		$	1,625	$	—	$	(21	)	$	1,553
Other	OA / (AP)	7		(2		)	326		1		(2		)	75
		$	78	$	(2	)	$	1,951	$	1	$	(23	)	$	1,628
GLB (3)	(AP) / (FPB)	$	—	$	(529	)	$	1,175	$	—	$	(550	)	$	1,083

⁽¹⁾  Includes fair value of embedded derivatives.

⁽²⁾  Related to GMDB and GLB blocks of business.

⁽³⁾  Includes both future policy benefits reserves and fair value derivative adjustment. Note that the payment provision related to GLB is the net amount at risk. The concept of a notional value does not apply to the GLB reinsurance contracts.

At March 31, 2018 and December 31, 2017, derivative assets of $79 million and derivative liabilities of $24 million, respectively, included in the table above were subject to a master netting agreement. The remaining derivatives included in the table above were not subject to a master netting agreement. 

b) Secured borrowings

Chubb participates in a securities lending program operated by a third-party banking institution whereby certain assets are loaned to qualified borrowers and from which we earn an incremental return. The securities lending collateral can only be drawn down by Chubb in the event that the institution borrowing the securities is in default under the lending agreement. An indemnification agreement with the lending agent protects us in the event a borrower becomes insolvent or fails to return any of the securities on loan.The collateral is recorded in Securities lending collateral and the liability is recorded in Securities lending payable in the Consolidated balance sheets.

Potential risks exist in our secured borrowing transactions due to market conditions and counterparty exposure. With collateral that we pledge, there is a risk that the collateral may not be returned at the expiration of the agreement. If the counterparty fails to return the collateral, Chubb will have free use of the borrowed funds until our collateral is returned. In addition, we may encounter the risk that Chubb may not be able to renew outstanding borrowings with a new term or with an existing counterparty due to market conditions including a decrease in demand as well as more restrictive terms from banks due to increased regulatory and capital constraints. Should this condition occur, Chubb may seek alternative borrowing sources or reduce borrowings. Additionally, increased margins and collateral requirements due to market conditions would increase our restricted assets as we are required to provide additional collateral to support the transaction.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

The following table presents the carrying value of collateral held under securities lending agreements by investment category and remaining contractual maturity of the underlying agreements:

	Remaining contractual maturity
	March 31		December 31
	2018		2017
(in millions of U.S. dollars)	Overnight and Continuous
Collateral held under securities lending agreements:
Cash	$	826	$	828
U.S. Treasury and agency	40		36
Foreign	869		712
Corporate securities	8		—
Mortgage-backed securities	59		74
Equity securities	237		87
	$	2,039	$	1,737
Gross amount of recognized liability for securities lending payable	$	2,039	$	1,737

AtMarch 31, 2018and December 31, 2017, our repurchase agreement obligations of$1,412 millionand$1,408 million, respectively, were fully collateralized. In contrast to securities lending programs, the use of cash received is not restricted for the repurchase obligations.The fair value of the underlying securities sold remains in Fixed maturities available for sale and the repurchase agreement obligation is recorded in Repurchase agreements in the Consolidated balance sheets.  

The following table presents the carrying value of collateral pledged under repurchase agreements by investment category and remaining contractual maturity of the underlying agreements:

	Remaining contractual maturity
	March 31, 2018						December 31, 2017
	30-90 Days		Greater than 90 Days		Total		Up to 30 Days		Greater than 90 Days		Total
(in millions of U.S. dollars)
Collateral pledged under repurchase agreements:
U.S. Treasury and agency	$	—	$	243	$	243	$	9	$	230	$	239
Mortgage-backed securities	486		731		1,217		369		826		1,195
	$	486	$	974	$	1,460	$	378	$	1,056	$	1,434
Gross amount of recognized liabilities for repurchase agreements					$	1,412					$	1,408
Difference (1)					$	48					$	26

⁽¹⁾  Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

The following table presents net realized gains (losses) related to derivative instrument activity in the Consolidated statements of operations:

	Three Months Ended
	March 31
(in millions of U.S. dollars)	2018		2017
Investment and embedded derivative instruments:
Foreign currency forward contracts	$	4	$	14
All other futures contracts and options	13		(8		)
Total investment and embedded derivative instruments	$	17	$	6
GLB and other derivative instruments:
GLB (1)	$	38	$	93
Futures contracts on equities (2)	22		(74		)
Other	2		2
Total GLB and other derivative instruments	$	62	$	21
	$	79	$	27

⁽¹⁾  Excludes foreign exchange gains (losses) related to GLB.

⁽²⁾  Related to GMDB and GLB blocks of business.

c) Derivative instrument objectives

(i) Foreign currency exposure management

A foreign currency forward contract (forward) is an agreement between participants to exchange specific foreign currencies at a future date. Chubb uses forwards to minimize the effect of fluctuating foreign currencies as discussed above.

(ii) Duration management and market exposure

Futures

Futures contracts give the holder the right and obligation to participate in market movements, determined by the index or underlying security on which the futures contract is based. Settlement is made daily in cash by an amount equal to the change in value of the futures contract times a multiplier that scales the size of the contract. Exchange-traded futures contracts on money market instruments, notes, and bonds are used in fixed maturity portfolios to more efficiently manage duration, as substitutes for ownership of the money market instruments, bonds, and notes without significantly increasing the risk in the portfolio. Investments in futures contracts may be made only to the extent that there are assets under management not otherwise committed.

Exchange-traded equity futures contracts are used to limit exposure to a severe equity market decline, which would cause an increase in expected claims and therefore, an increase in reserves for GMDB and GLB reinsurance business.

Options

An option contract conveys to the holder the right, but not the obligation, to purchase or sell a specified amount or value of an underlying security at a fixed price. Option contracts are used in the investment portfolio as protection against unexpected shifts in interest rates, which would affect the duration of the fixed maturity portfolio. By using options in the portfolio, the overall interest rate sensitivity of the portfolio can be reduced. Option contracts may also be used as an alternative to futures contracts in the synthetic strategy as described above.

The price of an option is influenced by the underlying security, expected volatility, time to expiration, and supply and demand.

The credit risk associated with the above derivative financial instruments relates to the potential for non-performance by counterparties. Although non-performance is not anticipated, in order to minimize the risk of loss, management monitors the creditworthiness of its counterparties and obtains collateral. The performance of exchange-traded instruments is guaranteed by the exchange on which they trade. For non-exchange-traded instruments, the counterparties are principally banks which must meet certain criteria according to our investment guidelines.

Cross-currency swaps

Cross-currency swaps are agreements under which two counterparties exchange interest payments and principal denominated in different currencies at a future date. We use cross-currency swaps to reduce the foreign currency and interest rate risk by

27

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

converting cash flows back into local currency. We invest in foreign currency denominated investments to improve credit diversification and also to obtain better duration matching to our liabilities that is limited in the local currency market.

Other

Included within Other are derivatives intended to reduce potential losses which may arise from certain exposures in our insurance business. The economic benefit provided by these derivatives is similar to purchased reinsurance. For example, Chubb may enter into crop derivative contracts to protect underwriting results in the event of a significant decline in commodity prices.

(iii) Convertible security investments

A convertible security is a debt instrument or preferred stock that can be converted into a predetermined amount of the issuer’s equity. The convertible option is an embedded derivative within the host instruments which are classified in the investment portfolio as either available for sale or as an equity security. Chubb purchases convertible securities for their total return and not specifically for the conversion feature.

(iv) TBA

By acquiring TBAs, we make a commitment to purchase a future issuance of mortgage-backed securities. For the period between purchase of the TBAs and issuance of the underlying security, we account for our position as a derivative in the consolidated financial statements. Chubb purchases TBAs both for their total return and for the flexibility they provide related to our mortgage-backed security strategy.

(v) GLB

Under the GLB program, as the assuming entity, Chubb is obligated to provide coverage until the expiration or maturity of the underlying deferred annuity contracts or the expiry of the reinsurance treaty. Premiums received under the reinsurance treaties are classified as premium. Expected losses allocated to premiums received are classified as Future policy benefits and valued similar to GMDB reinsurance. Other changes in fair value, principally arising from changes in expected losses allocated to expected future premiums, are classified as Net realized gains (losses). Fair value represents management’s estimate of an exit price and thus, includes a risk margin. We may recognize a realized loss for other changes in fair value due to adverse changes in the capital markets (e.g., declining interest rates and/or declining equity markets) and changes in actual or estimated future policyholder behavior (e.g., increased annuitization or decreased lapse rates) although we expect the business to be profitable. We believe this presentation provides the most meaningful disclosure of changes in the underlying risk within the GLB reinsurance programs for a given reporting period.

d) Fixed maturities

At March 31, 2018, we have commitments to purchase fixed income securities of $1,139 million over the next several years.

e) Other investments

At March 31, 2018, included in Other investments in the Consolidated balance sheets are investments in limited partnerships and partially-owned investment companies with a carrying value of $3.6 billion. In connection with these investments, we have commitments that may require funding of up to $3.8 billion over the next several years.

f) Taxation

At March 31, 2018, $14 million of unrecognized tax benefits remain outstanding. It is reasonably possible that over the next twelve months, the amount of unrecognized tax benefits may change resulting from the re-evaluation of unrecognized tax benefits arising from examinations of taxing authorities and the closing of tax statute limitations. With few exceptions, Chubb is no longer subject to state and local or non-U.S. income tax examinations for years before 2010.

g) Legal proceedings

Our insurance subsidiaries are subject to claims litigation involving disputed interpretations of policy coverages and, in some jurisdictions, direct actions by allegedly-injured persons seeking damages from policyholders. These lawsuits, involving claims on policies issued by our subsidiaries which are typical to the insurance industry in general and in the normal course of business, are considered in our loss and loss expense reserves. In addition to claims litigation, we are subject to lawsuits and regulatory actions in the normal course of business that do not arise from or directly relate to claims on insurance policies. This category of business litigation typically involves, among other things, allegations of underwriting errors or misconduct, employment claims, regulatory activity, or disputes arising from our business ventures. In the opinion of management, our ultimate liability for these matters could be, but we believe is not likely to be, material to our consolidated financial condition and results of operations.

28

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Chubb Limited and Subsidiaries

7. Shareholders’ equity

All of Chubb’s Common Shares are authorized under Swiss corporate law. Though the par value of Common Shares is stated in Swiss francs, Chubb continues to use U.S. dollars as its reporting currency for preparing consolidated financial statements. Under Swiss corporate law, dividends, including distributions through a reduction in par value (par value reduction) or from legal reserves, must be stated in Swiss francs though dividend payments are made by Chubb in U.S. dollars. At March 31, 2018, our Common Shares had a par value of CHF 24.15 per share.

At our May 2017 and 2016 annual general meetings, our shareholders approved an annual dividend for the following year of up to $2.84 per share and $2.76 per share, respectively, which was paid in four quarterly installments of $0.71 per share and$0.69 per share, respectively, at dates determined by the Board of Directors (Board) after the annual general meetings by way of a distribution from capital contribution reserves, transferred to free reserves for payment.

Dividend distributions per Common Share for the three months ended March 31, 2018 and 2017 were $0.71 (CHF 0.66) and $0.69 (CHF 0.69), per Common Share, respectively.

Common Shares in treasury are used principally for issuance upon the exercise of employee stock options, grants of restricted stock, and purchases under the Employee Stock Purchase Plan (ESPP). At March 31, 2018, 13,952,378 Common Shares remain in treasury after net shares redeemed under employee share-based compensation plans.

Chubb Limited securities repurchase authorization

In November 2016, the Board authorized a share repurchase program of $1.0 billion of Chubb's Common Shares through December 31, 2017. In December 2017, the Board authorized a share repurchase program of $1.0 billion of Chubb's Common Shares from January 1, 2018 through December 31, 2018.

The following table presents repurchases of Chubb's Common Shares conducted in a series of open market transactions under the Board authorizations:

	Three Months Ended March 31
(in millions of U.S. dollars, except share data)	2018		2017
Number of shares repurchased	—		1,036,064
Cost of shares repurchased	$	—	$	140
Repurchase authorization remaining at end of period	$	1,000	$	860

8. Share-based compensation

The Chubb Limited 2016 Long-Term Incentive Plan (the 2016 LTIP) permits grants of both incentive and non-qualified stock options principally at an option price per share equal to the grant date fair value of Chubb's Common Shares. Stock options are generally granted with a 3-year vesting period and a 10-year term. Stock options typically vest in equal annual installments over the vesting period, which is also the requisite service period. On February 22, 2018, Chubb granted 1,841,329 stock options with a weighted-average grant date fair value of $29.71 each. The fair value of the options issued is estimated on the grant date using the Black-Scholes option pricing model.

29

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Chubb Limited and Subsidiaries

The 2016 LTIP also permits grants of service-based restricted stock and restricted stock units as well as performance-based restricted stock awards. Chubb generally grants service-based restricted stock and restricted stock units with a 4-year vesting period, based on a graded vesting schedule. Beginning in 2017, the performance-based stock awards granted comprise target awards which have 3-year cliff vesting provisions based on tangible book value (shareholders' equity less goodwill and intangible assets, net of tax) per share growth and P&C combined ratio compared to a defined group of peer companies. Premium performance-based stock awards are earned only if tangible book value per share growth and the P&C combined ratio over the cumulative 3-year period after the grant of the associated target awards exceed a higher threshold compared to our peer group, with an additional vesting provision based on total shareholder return compared to our peer group. The restricted stock is granted at market close price on the grant date. On February 22, 2018, Chubb granted 973,624 service-based restricted stock awards, 301,024 service-based restricted stock units, and 180,065 performance-based stock awards to employees and officers with a grant date fair value of $143.07 each. Each restricted stock unit represents our obligation to deliver to the holder one Common Share upon vesting.

9. Postretirement benefits

The components of net pension and other postretirement benefit costs (benefits) reflected in Net income in the Consolidated statements of operations were as follows:

	Pension Benefits												Other Postretirement Benefits
	2018						2017						2018			2017
Three Months Ended March 31	U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans
(in millions of U.S. dollars)
Service cost	$	14		$	3		$	16		$	4		$	—		$	—
Interest cost	26			7			26			7			1			1
Expected return on plan assets	(53		)	(13		)	(47		)	(10		)	(1		)	(1		)
Amortization of prior service cost	—			—			—			—			(21		)	(23		)
Net periodic (benefit) cost	$	(13	)	$	(3	)	$	(5	)	$	1		$	(21	)	$	(23	)

10. Segment information

Chubb operates through six business segments: North America Commercial P&C Insurance, North America Personal P&C Insurance, North America Agricultural Insurance, Overseas General Insurance, Global Reinsurance, and Life Insurance.

Corporate results primarily include income and expenses not attributable to reportable segments and loss and loss expenses of asbestos and environmental (A&E) liabilities.

For segment reporting purposes, certain items are presented in a different manner below than in the consolidated financial statements. Management uses underwriting income (loss) as the main measures of segment performance. Chubb calculates underwriting income (loss) by subtracting Losses and loss expenses, Policy benefits, Policy acquisition costs, and Administrative expenses from Net premiums earned. To calculate Segment income, include Net investment income, Other (income) expense, and Amortization of purchased intangibles. For the North America Agricultural Insurance segment, management includes gains and losses on crop derivatives as a component of underwriting income (loss). For example, for the three months ended March 31, 2018, underwriting income in our North America Agricultural Insurance segment was $102 million. This amount includes $2 million of realized gains related to crop derivatives which are reported in Net realized gains (losses) in the Corporate column below.

For the Life Insurance segment, management includes Net investment income and (Gains) losses from fair value changes in separate account assets that do not qualify for separate account reporting under GAAP as components of Life Insurance underwriting income. For example, for the three months ended March 31, 2018, Life Insurance underwriting income of $67 million includes Net investment income of $83 million and gains from fair value changes in separate account assets of $6 million. The gains from fair value changes in separate account assets are reported in Other (income) expense in the table below.

30

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

The following tables present the Statement of Operations by segment:

	North America Commercial P&C Insurance			North America Personal P&C Insurance			North America Agricultural Insurance			Overseas General Insurance		Global Reinsurance			Life Insurance			Corporate			Chubb Consolidated
For the Three Months Ended
March 31, 2018
(in millions of U.S. dollars)
Net premiums written	$	2,812		$	1,048		$	108		$	2,384	$	193		$	559		$	—		$	7,104
Net premiums earned	3,029			1,140			43			2,107		168			540			—			7,027
Losses and loss expenses	1,908			886			(53		)	1,078		67			205			11			4,102
Policy benefits	—			—			—			—		—			151			—			151
Policy acquisition costs	472			237			(1		)	588		40			128			—			1,464
Administrative expenses	231			65			(3		)	239		10			78			72			692
Underwriting income (loss)	418			(48		)	100			202		51			(22		)	(83		)	618
Net investment income (loss)	503			59			7			151		64			83			(61		)	806
Other (income) expense	(6		)	—			—			7		(7		)	(4		)	(37		)	(47		)
Amortization expense of purchased intangibles	—			3			7			10		—			1			64			85
Segment income (loss)	$	927		$	8		$	100		$	336	$	122		$	64		$	(171	)	$	1,386
Net realized gains (losses) including OTTI																		(2		)	(2		)
Interest expense																		157			157
Chubb integration expenses																		10			10
Income tax expense																		135			135
Net income (loss)																		$	(475	)	$	1,082

	North America Commercial P&C Insurance (1)		North America Personal P&C Insurance		North America Agricultural Insurance			Overseas General Insurance (1)			Global Reinsurance		Life Insurance			Corporate			Chubb Consolidated
For the Three Months Ended
March 31, 2017
(in millions of U.S. dollars)
Net premiums written	$	2,730	$	984	$	61		$	2,212		$	199	$	524		$	—		$	6,710
Net premiums earned	3,041		1,086		14			1,936			189		506			—			6,772
Losses and loss expenses	1,860		633		(73		)	1,071			94		193			11			3,789
Policy benefits	—		—		—			—			—		168			—			168
Policy acquisition costs	487		217		(1		)	529			51		114			—			1,397
Administrative expenses	231		65		(5		)	245			10		72			58			676
Underwriting income (loss)	463		171		93			91			34		(41		)	(69		)	742
Net investment income (loss)	478		55		6			148			62		75			(79		)	745
Other (income) expense	4		1		—			(1		)	—		(29		)	(45		)	(70		)
Amortization expense of purchased intangibles	—		3		7			11			—		1			42			64
Segment income (loss)	$	937	$	222	$	92		$	229		$	96	$	62		$	(145	)	$	1,493
Net realized gains (losses) including OTTI																(7		)	(7		)
Interest expense																154			154
Chubb integration expenses																111			111
Income tax expense																128			128
Net income (loss)																$	(545	)	$	1,093

⁽¹⁾ The 2017 net premiums written amount was revised to reflect the transfer of certain multinational accounts ($12 million) from the North America Commercial P&C Insurance segment to the Overseas General Insurance segment to better align the reporting with the management of these businesses in 2018. There is no impact on a consolidated basis.

31

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

Underwriting assets are reviewed in total by management for purposes of decision-making. Other than Unpaid losses and loss expenses, Reinsurance recoverables, Goodwill and Other intangible assets, Chubb does not allocate assets to its segments.

11. Earnings per share

	Three Months Ended
	March 31
(in millions of U.S. dollars, except share and per share data)	2018		2017
Numerator:
Net income	$	1,082	$	1,093
Denominator:
Denominator for basic earnings per share:
Weighted-average shares outstanding	465,703,240		468,903,086
Denominator for diluted earnings per share:
Share-based compensation plans	3,770,351		3,828,604
Weighted-average shares outstanding and assumed conversions	469,473,591		472,731,690
Basic earnings per share	$	2.32	$	2.33
Diluted earnings per share	$	2.30	$	2.31
Potential anti-dilutive share conversions	2,116,188		969,654

Excluded from weighted-average shares outstanding and assumed conversions is the impact of securities that would have been anti-dilutive during the respective periods.

32

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

12. Information provided in connection with outstanding debt of subsidiaries

The following tables present condensed consolidating financial information at March 31, 2018 and December 31, 2017, and for the three months ended March 31, 2018 and 2017 for Chubb Limited (Parent Guarantor) and Chubb INA Holdings Inc. (Subsidiary Issuer). The Subsidiary Issuer is an indirect 100 percent-owned subsidiary of the Parent Guarantor. The Parent Guarantor fully and unconditionally guarantees certain of the debt of the Subsidiary Issuer. Condensed consolidating financial information of the Parent Guarantor and Subsidiary Issuer are presented on the equity method of accounting. The revenues and expenses and cash flows of the subsidiaries of the Subsidiary Issuer are presented in the Other Chubb Limited Subsidiaries column on a combined basis.

Condensed Consolidating Balance Sheet at March 31, 2018

(in millions of U.S. dollars)	Chubb Limited (Parent Guarantor)		Chubb INA Holdings Inc. (Subsidiary Issuer)		Other Chubb Limited Subsidiaries		Consolidating Adjustments and Eliminations			Chubb Limited Consolidated
Assets
Investments	$	—	$	186	$	101,919	$	—		$	102,105
Cash (1)	1		864		1,523		(400		)	1,988
Restricted cash	—		—		125		—			125
Insurance and reinsurance balances receivable	—		—		10,308		(738		)	9,570
Reinsurance recoverable on losses and loss expenses	—		—		26,093		(11,111		)	14,982
Reinsurance recoverable on policy benefits	—		—		1,181		(1,000		)	181
Value of business acquired	—		—		321		—			321
Goodwill and other intangible assets	—		—		22,123		—			22,123
Investments in subsidiaries	43,032		51,930		—		(94,962		)	—
Due from subsidiaries and affiliates, net	8,980		—		251		(9,231		)	—
Other assets	4		386		18,459		(1,463		)	17,386
Total assets	$	52,017	$	53,366	$	182,303	$	(118,905	)	$	168,781
Liabilities
Unpaid losses and loss expenses	$	—	$	—	$	74,299	$	(11,160	)	$	63,139
Unearned premiums	—		—		16,563		(1,068		)	15,495
Future policy benefits	—		—		6,412		(1,000		)	5,412
Due to subsidiaries and affiliates, net	—		9,231		—		(9,231		)	—
Affiliated notional cash pooling programs (1)	400		—		—		(400		)	—
Repurchase agreements	—		—		1,412		—			1,412
Short-term debt	—		1,669		—		—			1,669
Long-term debt	—		12,775		11		—			12,786
Trust preferred securities	—		308		—		—			308
Other liabilities	330		1,537		16,490		(1,084		)	17,273
Total liabilities	730		25,520		115,187		(23,943		)	117,494
Total shareholders’ equity	51,287		27,846		67,116		(94,962		)	51,287
Total liabilities and shareholders’ equity	$	52,017	$	53,366	$	182,303	$	(118,905	)	$	168,781

⁽¹⁾  Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2018, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

33

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

Condensed Consolidating Balance Sheet at December 31, 2017

(in millions of U.S. dollars)	Chubb Limited (Parent Guarantor)		Chubb INA Holdings Inc. (Subsidiary Issuer)		Other Chubb Limited Subsidiaries		Consolidating Adjustments and Eliminations			Chubb Limited Consolidated
Assets
Investments	$	—	$	168	$	102,276	$	—		$	102,444
Cash (1)	3		1		839		(115		)	728
Restricted cash	—		—		123		—			123
Insurance and reinsurance balances receivable	—		—		10,820		(1,486		)	9,334
Reinsurance recoverable on losses and loss expenses	—		—		27,514		(12,480		)	15,034
Reinsurance recoverable on policy benefits	—		—		1,194		(1,010		)	184
Value of business acquired	—		—		326		—			326
Goodwill and other intangible assets	—		—		22,054		—			22,054
Investments in subsidiaries	41,909		51,165		—		(93,074		)	—
Due from subsidiaries and affiliates, net	9,639		—		—		(9,639		)	—
Other assets	3		287		20,578		(4,073		)	16,795
Total assets	$	51,554	$	51,621	$	185,724	$	(121,877	)	$	167,022
Liabilities
Unpaid losses and loss expenses	$	—	$	—	$	74,767	$	(11,588	)	$	63,179
Unearned premiums	—		—		18,875		(3,659		)	15,216
Future policy benefits	—		—		6,331		(1,010		)	5,321
Due to subsidiaries and affiliates, net	—		9,432		207		(9,639		)	—
Affiliated notional cash pooling programs (1)	—		115		—		(115		)	—
Repurchase agreements	—		—		1,408		—			1,408
Short-term debt	—		1,013		—		—			1,013
Long-term debt	—		11,546		10		—			11,556
Trust preferred securities	—		308		—		—			308
Other liabilities	382		1,411		18,848		(2,792		)	17,849
Total liabilities	382		23,825		120,446		(28,803		)	115,850
Total shareholders’ equity	51,172		27,796		65,278		(93,074		)	51,172
Total liabilities and shareholders’ equity	$	51,554	$	51,621	$	185,724	$	(121,877	)	$	167,022

⁽¹⁾  Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2017, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

34

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

Condensed Consolidating Statements of Operations and Comprehensive Income

For the Three Months Ended March 31, 2018	Chubb Limited (Parent Guarantor)			Chubb INA Holdings Inc. (Subsidiary Issuer)			Other Chubb Limited Subsidiaries			Consolidating Adjustments and Eliminations			Chubb Limited Consolidated
(in millions of U.S. dollars)
Net premiums written	$	—		$	—		$	7,104		$	—		$	7,104
Net premiums earned	—			—			7,027			—			7,027
Net investment income	2			4			800			—			806
Equity in earnings of subsidiaries	1,022			885			—			(1,907		)	—
Net realized gains (losses) including OTTI	(2		)	(24		)	24			—			(2		)
Losses and loss expenses	—			—			4,102			—			4,102
Policy benefits	—			—			151			—			151
Policy acquisition costs and administrative expenses	18			22			2,116			—			2,156
Interest (income) expense	(80		)	209			28			—			157
Other (income) expense	(5		)	8			(50		)	—			(47		)
Amortization of purchased intangibles	—			—			85			—			85
Chubb integration expenses	2			1			7			—			10
Income tax expense (benefit)	5			(59		)	189			—			135
Net income	$	1,082		$	684		$	1,223		$	(1,907	)	$	1,082
Comprehensive income	$	453		$	216		$	614		$	(830	)	$	453

Condensed Consolidating Statements of Operations and Comprehensive Income

For the Three Months Ended March 31, 2017	Chubb Limited (Parent Guarantor)			Chubb INA Holdings Inc. (Subsidiary Issuer)			Other Chubb Limited Subsidiaries			Consolidating Adjustments and Eliminations			Chubb Limited Consolidated
(in millions of U.S. dollars)
Net premiums written	$	—		$	—		$	6,710		$	—		$	6,710
Net premiums earned	—			—			6,772			—			6,772
Net investment income	—			3			742			—			745
Equity in earnings of subsidiaries	1,027			701			—			(1,728		)	—
Net realized gains (losses) including OTTI	—			(13		)	6			—			(7		)
Losses and loss expenses	—			—			3,789			—			3,789
Policy benefits	—			—			168			—			168
Policy acquisition costs and administrative expenses	18			14			2,041			—			2,073
Interest (income) expense	(84		)	221			17			—			154
Other (income) expense	(6		)	15			(79		)	—			(70		)
Amortization of purchased intangibles	—			—			64			—			64
Chubb integration expenses	—			49			62			—			111
Income tax expense (benefit)	6			(112		)	234			—			128
Net income	$	1,093		$	504		$	1,224		$	(1,728	)	$	1,093
Comprehensive income	$	1,407		$	791		$	1,538		$	(2,329	)	$	1,407

35

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2018	Chubb Limited (Parent Guarantor)			Chubb INA Holdings Inc. (Subsidiary Issuer)			Other Chubb Limited Subsidiaries			Consolidating Adjustments and Eliminations			Chubb Limited Consolidated
(in millions of U.S. dollars)
Net cash flows from operating activities	$	24		$	2,727		$	800		$	(3,000	)	$	551
Cash flows from investing activities
Purchases of fixed maturities available for sale	—			(8		)	(5,964		)	—			(5,972		)
Purchases of fixed maturities held to maturity	—			—			(162		)	—			(162		)
Purchases of equity securities	—			—			(55		)	—			(55		)
Sales of fixed maturities available for sale	—			—			2,562			—			2,562
Sales of equity securities	—			—			40			—			40
Maturities and redemptions of fixed maturities available for sale	—			3			1,862			—			1,865
Maturities and redemptions of fixed maturities held to maturity	—			—			255			—			255
Net change in short-term investments	—			(14		)	745			—			731
Net derivative instruments settlements	—			(7		)	46			—			39
Private equity contributions	—			—			(353		)	—			(353		)
Private equity distributions	—			—			201			—			201
Capital contribution	(750		)	(3,500		)	—			4,250			—
Other	—			(3		)	(29		)	—			(32		)
Net cash flows used for investing activities	(750		)	(3,529		)	(852		)	4,250			(881		)
Cash flows from financing activities
Dividends paid on Common Shares	(330		)	—			—			—			(330		)
Common Shares repurchased	—			—			(29		)	—			(29		)
Proceeds from issuance of long-term debt	—			2,175			—			—			2,175
Repayment of long-term debt	—			(300		)	—			—			(300		)
Proceeds from issuance of repurchase agreements	—			—			408			—			408
Repayment of repurchase agreements	—			—			(404		)	—			(404		)
Proceeds from share-based compensation plans	—			—			34			—			34
Dividend to parent company	—			—			(3,000		)	3,000			—
Advances (to) from affiliates	656			(95		)	(561		)	—			—
Capital contribution	—			—			4,250			(4,250		)	—
Net proceeds from (payments to) affiliated notional cash pooling programs(1)	400			(115		)	—			(285		)	—
Policyholder contract deposits	—			—			118			—			118
Policyholder contract withdrawals	—			—			(105		)	—			(105		)
Net cash flows from financing activities	726			1,665			711			(1,535		)	1,567
Effect of foreign currency rate changes on cash and restricted cash	(2		)	—			27			—			25
Net increase (decrease) in cash and restricted cash	(2		)	863			686			(285		)	1,262
Cash and restricted cash – beginning of period(1)	3			1			962			(115		)	851
Cash and restricted cash – end of period(1)	$	1		$	864		$	1,648		$	(400	)	$	2,113

⁽¹⁾  Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2018 and December 31, 2017, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

36

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued (Unaudited)

Chubb Limited and Subsidiaries

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2017	Chubb Limited (Parent Guarantor)			Chubb INA Holdings Inc. (Subsidiary Issuer)			Other Chubb Limited Subsidiaries			Consolidating Adjustments and Eliminations			Chubb Limited Consolidated
(in millions of U.S. dollars)
Net cash flows from (used for) operating activities	$	584		$	(156	)	$	1,081		$	(496	)	$	1,013
Cash flows from investing activities
Purchases of fixed maturities available for sale	—			(4		)	(6,246		)	—			(6,250		)
Purchases of fixed maturities held to maturity	—			—			(157		)	—			(157		)
Purchases of equity securities	—			—			(37		)	—			(37		)
Sales of fixed maturities available for sale	—			—			3,395			—			3,395
Sales of equity securities	—			—			46			—			46
Maturities and redemptions of fixed maturities    available for sale	—			7			2,536			—			2,543
Maturities and redemptions of fixed maturities held to maturity	—			—			240			—			240
Net change in short-term investments	—			173			59			—			232
Net derivative instruments settlements	—			(2		)	(87		)	—			(89		)
Private equity contributions	—			—			(198		)	—			(198		)
Private equity distributions	—			—			315			—			315
Other	—			—			(106		)	—			(106		)
Net cash flows from (used for) investing activities	—			174			(240		)	—			(66		)
Cash flows from financing activities
Dividends paid on Common Shares	(324		)	—			—			—			(324		)
Common Shares repurchased	—			—			(128		)	—			(128		)
Proceeds from issuance of repurchase agreements	—			—			753			—			753
Repayment of long-term debt	—			(500		)	—			—			(500		)
Repayment of repurchase agreements	—			—			(752		)	—			(752		)
Proceeds from share-based compensation plans	—			—			42			—			42
Dividend to parent company	—			—			(496		)	496			—
Advances (to) from affiliates	108			(171		)	63			—			—
Net proceeds from (payments to) affiliated notional cash pooling programs(1)	(363		)	653			—			(290		)	—
Policyholder contract deposits	—			—			109			—			109
Policyholder contract withdrawals	—			—			(58		)	—			(58		)
Net cash flows used for financing activities	(579		)	(18		)	(467		)	206			(858		)
Effect of foreign currency rate changes on cash and restricted cash	—			—			(17		)	—			(17		)
Net increase in cash and restricted cash	5			—			357			(290		)	72
Cash and restricted cash – beginning of period(1)	1			1			2,068			(982		)	1,088
Cash and restricted cash – end of period(1)	$	6		$	1		$	2,425		$	(1,272	)	$	1,160

⁽¹⁾  Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2017 and December 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

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ITEM 2. Management's Discussion and Analysis of Financial Condition and Results of Operations

The following is a discussion of our results of operations, financial condition, and liquidity and capital resources as of and for the three months ended March 31, 2018.

All comparisons in this discussion are to the corresponding prior year period unless otherwise indicated.

Our results of operations and cash flows for any interim period are not necessarily indicative of our results for the full year. This discussion should be read in conjunction with our consolidated financial statements and related notes and our Management’s Discussion and Analysis of Financial Condition and Results of Operations included in our Annual Report on Form 10-K for the year ended December 31, 2017 (2017 Form 10-K).

Other Information

We routinely post important information for investors on our website (investors.chubb.com). We use this website as a means of disclosing material, non-public information and for complying with our disclosure obligations under Securities and Exchange Commission (SEC) Regulation FD (Fair Disclosure). Accordingly, investors should monitor the Investor Information portion of our website, in addition to following our press releases, SEC filings, public conference calls, and webcasts. The information contained on, or that may be accessed through, our website is not incorporated by reference into, and is not a part of, this report.

MD&A Index	Page
Forward-Looking Statements	39
Overview	41
Financial Highlights	41
Consolidated Operating Results	41
Segment Operating Results	46
Effective Income Tax Rate	57
Non-GAAP Reconciliation	58
Other Income and Expense Items	61
Amortization of Purchased Intangibles and Other Amortization	61
Interest Expense	63
Net Investment Income	63
Net Realized and Unrealized Gains (Losses)	64
Investments	65
Critical Accounting Estimates	68
Reinsurance Recoverable on Ceded Reinsurance	68
Unpaid Losses and Loss Expenses	69
Asbestos and Environmental (A&E)	69
Fair Value Measurements	69
Catastrophe Management	70
Natural Catastrophe Property Reinsurance Program	70
Crop Insurance	71
Liquidity	72
Capital Resources	73

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Forward-Looking Statements

The Private Securities Litigation Reform Act of 1995 provides a “safe harbor” for forward-looking statements. Any written or oral statements made by us or on our behalf may include forward-looking statements that reflect our current views with respect to future events and financial performance. These forward-looking statements are subject to certain risks, uncertainties, and other factors that could, should potential events occur, cause actual results to differ materially from such statements. These risks, uncertainties, and other factors, which are described in more detail elsewhere herein and in other documents we file with the U.S. Securities and Exchange Commission (SEC), include but are not limited to:

• losses arising out of natural or man-made catastrophes such as hurricanes, typhoons, earthquakes, floods, climate change (including effects on weather patterns; greenhouse gases; sea; land and air temperatures; sea levels; and rain and snow), nuclear accidents, or terrorism which could be affected by:

• the number of insureds and ceding companies affected;

• the amount and timing of losses actually incurred and reported by insureds;

• the impact of these losses on our reinsurers and the amount and timing of reinsurance recoverable actually received;

• the cost of building materials and labor to reconstruct properties or to perform environmental remediation following a catastrophic event; and

• complex coverage and regulatory issues such as whether losses occurred from storm surge or flooding and related lawsuits;

• actions that rating agencies may take from time to time, such as financial strength or credit ratings downgrades or placing these ratings on credit watch negative or the equivalent;

• the ability to collect reinsurance recoverable, credit developments of reinsurers, and any delays with respect thereto and changes in the cost, quality, or availability of reinsurance;

• actual loss experience from insured or reinsured events and the timing of claim payments;

• the uncertainties of the loss-reserving and claims-settlement processes, including the difficulties associated with assessing environmental damage and asbestos-related latent injuries, the impact of aggregate-policy-coverage limits, the impact of bankruptcy protection sought by various asbestos producers and other related businesses, and the timing of loss payments;

• changes to our assessment as to whether it is more likely than not that we will be required to sell, or have the intent to sell, available for sale fixed maturity investments before their anticipated recovery;

• infection rates and severity of pandemics and their effects on our business operations and claims activity;

• developments in global financial markets, including changes in interest rates, stock markets, and other financial markets, increased government involvement or intervention in the financial services industry, the cost and availability of financing, and foreign currency exchange rate fluctuations (which we refer to in this report as foreign exchange and foreign currency exchange), which could affect our statement of operations, investment portfolio, financial condition, and financing plans;

• general economic and business conditions resulting from volatility in the stock and credit markets and the depth and duration of potential recession;

• global political conditions, the occurrence of any terrorist attacks, including any nuclear, radiological, biological, or chemical events, or the outbreak and effects of war, and possible business disruption or economic contraction that may result from such events;

• the potential impact of the United Kingdom’s vote to withdraw from the European Union, including political, regulatory, social, and economic uncertainty and market and exchange rate volatility;

• judicial decisions and rulings, new theories of liability, legal tactics, and settlement terms;

• the effects of public company bankruptcies and/or accounting restatements, as well as disclosures by and investigations of public companies relating to possible accounting irregularities, and other corporate governance issues, including the effects of such events on:

• the capital markets;

• the markets for directors and officers (D&O) and errors and omissions (E&O) insurance; and

• claims and litigation arising out of such disclosures or practices by other companies;

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• uncertainties relating to governmental, legislative and regulatory policies, developments, actions, investigations, and treaties, which, among other things, could subject us to insurance regulation or taxation in additional jurisdictions or affect our current operations;

• the actual amount of new and renewal business, market acceptance of our products, and risks associated with the introduction of new products and services and entering new markets, including regulatory constraints on exit strategies;

• the competitive environment in which we operate, including trends in pricing or in policy terms and conditions, which may differ from our projections and changes in market conditions that could render our business strategies ineffective or obsolete;

• acquisitions made by us performing differently than expected, our failure to realize anticipated expense-related efficiencies or growth from acquisitions, the impact of acquisitions on our pre-existing organization, or announced acquisitions not closing;

• risks associated with being a Swiss corporation, including reduced flexibility with respect to certain aspects of capital management and the potential for additional regulatory burdens;

• the potential impact from government-mandated insurance coverage for acts of terrorism;

• the availability of borrowings and letters of credit under our credit facilities;

• the adequacy of collateral supporting funded high deductible programs;

• changes in the distribution or placement of risks due to increased consolidation of insurance and reinsurance brokers;

• material differences between actual and expected assessments for guaranty funds and mandatory pooling arrangements;

• the effects of investigations into market practices in the property and casualty (P&C) industry;

• changing rates of inflation and other economic conditions, for example, recession;

• the amount of dividends received from subsidiaries;

• loss of the services of any of our executive officers without suitable replacements being recruited in a reasonable time frame;

• the ability of our technology resources, including information systems and security, to perform as anticipated such as with respect to preventing material information technology failures or third-party infiltrations or hacking resulting in consequences adverse to Chubb or its customers or partners;

• the ability of our company to increase use of data analytics and technology as part of our business strategy and adapt to new technologies; and

• management’s response to these factors and actual events (including, but not limited to, those described above).

The words “believe,” “anticipate,” “estimate,” “project,” “should,” “plan,” “expect,” “intend,” “hope,” “feel,” “foresee,” “will likely result,” or “will continue,” and variations thereof and similar expressions, identify forward-looking statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of their dates. We undertake no obligation to publicly update or review any forward-looking statements, whether as a result of new information, future events, or otherwise.

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Overview

Chubb Limited is the Swiss-incorporated holding company of the Chubb Group of Companies. Chubb Limited, which is headquartered in Zurich, Switzerland, and its direct and indirect subsidiaries (collectively, the Chubb Group of Companies, Chubb, we, us, or our) are a global insurance and reinsurance organization, serving the needs of a diverse group of clients worldwide. At March 31, 2018, we had total assets of $169 billion and shareholders’ equity of $51 billion. Chubb was incorporated in 1985 at which time it opened its first business office in Bermuda and continues to maintain operations in Bermuda. We operate through six business segments: North America Commercial P&C Insurance, North America Personal P&C Insurance, North America Agricultural Insurance, Overseas General Insurance, Global Reinsurance, and Life Insurance. For more information on our segments refer to “Segment Information” under Item 1 in our 2017 Form 10-K.

Financial Highlights for the Three Months Ended March 31, 2018

• Net income was $1,082 million compared with $1,093 million in the prior year period.

• Total company and P&C net premiums written were $7.1 billion and $6.5 billion, respectively, up 5.9 percent and 5.8 percent.

• Total pre-tax and after-tax catastrophe losses were $380 million (5.8 percentage points of the combined ratio) and $303 million, respectively, compared with $206 million (3.3 percentage points of the combined ratio) and $164 million, respectively, last year.

• P&C combined ratio was 90.1 percent compared with 87.5 percent prior year. P&C current accident year combined ratio excluding catastrophe losses was 87.6 percent compared with 88.0 percent prior year.

• Total pre-tax and after-tax favorable prior period development were $209 million (3.3 percentage points of the combined ratio) and $166 million, respectively, compared with $231 million (3.8 percentage points of the combined ratio) and $155 million, respectively, last year.

• Net investment income was $806 million compared with $745 million in the prior year period. Excluding the amortization of the fair value adjustment on acquired invested assets of The Chubb Corporation (Chubb Corp), net investment income was $877 million, compared with $836 million, up 4.9 percent.

Consolidated Operating Results – Three Months Ended March 31, 2018 and 2017

	Three Months Ended
	March 31						% Change
(in millions of U.S. dollars, except for percentages)	2018			2017			Q-18 vs. Q-17
Net premiums written (1)	$	7,104		$	6,710		5.9	%
Net premiums earned (1)	7,027			6,772			3.8	%
Net investment income	806			745			8.2	%
Net realized gains (losses)	(2		)	(7		)	(71.4	)%
Total revenues	7,831			7,510			4.3	%
Losses and loss expenses	4,102			3,789			8.3	%
Policy benefits	151			168			(10.1	)%
Policy acquisition costs	1,464			1,397			4.8	%
Administrative expenses	692			676			2.4	%
Interest expense	157			154			1.9	%
Other (income) expense	(47		)	(70		)	(32.9	)%
Amortization of purchased intangibles	85			64			32.8	%
Chubb integration expenses	10			111			(91.0	)%
Total expenses	6,614			6,289			5.2	%
Income before income tax	1,217			1,221			(0.3	)%
Income tax expense	135			128			5.5	%
Net income	$	1,082		$	1,093		(1.1	)%

⁽¹⁾ On a constant-dollar basis for the three months ended March 31, 2018, net premiums written increased$239 million, or 3.5 percent, and net premiums earned increased$129 million, or 1.9 percent. Amounts are calculated by translating prior period results using the same local currency exchange rates as the comparable current period.

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Line of Business

The following table presents a breakdown of consolidated net premiums written by line of business for the period indicated:

							Three Months Ended
							March 31
(in millions of U.S. dollars, except for percentages)	2018		2017		% Change Q-18 vs. Q-17		C$ (1) 2017		C$ (1) %Change Q-18 vs. Q-17
Commercial multiple peril (2)	$	201	$	201	—		$	201	—
Commercial casualty	1,145		1,049		9.2	%	1,071		6.9	%
Workers' compensation	624		588		6.1	%	588		6.1	%
Professional liability	773		763		1.3	%	807		(4.2	)%
Surety	161		150		7.3	%	153		5.2	%
Property and other short-tail lines	1,040		1,044		(0.4	)%	1,053		(1.2	)%
Total Commercial P&C	3,944		3,795		3.9	%	3,873		1.8	%
Agriculture	108		61		76.2	%	61		76.2	%
Personal automobile - North America	184		165		11.5	%	166		10.8	%
Personal automobile - International	214		186		15.1	%	198		8.1	%
Personal homeowners	738		697		5.9	%	699		5.6	%
Personal other	387		362		6.9	%	378		2.4	%
Total Personal lines	1,523		1,410		8.0	%	1,441		5.7	%
Total Property and Casualty lines	5,575		5,266		5.9	%	5,375		3.7	%
Global A&H lines (3)	1,072		994		7.8	%	1,029		4.2	%
Reinsurance lines	193		199		(3.0	)%	203		(4.8	)%
Life	264		251		5.2	%	258		2.3	%
Total consolidated	$	7,104	$	6,710	5.9	%	$	6,865	3.5	%

⁽¹⁾  On a constant-dollar basis. Amounts are calculated by translating prior period results using the same local currency exchange rates as the comparable current period.

⁽²⁾  Commercial multiple peril represents retail package business (property and general liability)

⁽³⁾  For purposes of this schedule only, A&H results from our Combined North America and International businesses, normally included in the Life Insurance and Overseas General Insurance segments, respectively, as well as the A&H results of our North America Commercial P&C segment, are included in Global A&H lines above.

Net Premiums Written

Net premiums written reflect the premiums we retain after purchasing reinsurance protection. Consolidated net premiums written increased$394 million for the three months ended March 31, 2018 reflecting growth across most segments.

• Net premiums written in our North America Commercial P&C Insurance segment increased$82 million for the three months ended March 31, 2018 primarily due to growth in our retail casualty and risk management businesses reflecting strong new business increases in both our large corporate and middle market accounts, and growth in our retail workers' compensation business due to stronger retention. In addition, our commercial segment experienced positive rate increases across a number of lines in both our Major account and middle market businesses. These increases were partially offset by planned portfolio management in certain of our retail and wholesale brokerage financial lines, and in our program business.

• Net premiums written in our North America Personal P&C Insurance segment increased$64 million for the three months ended March 31, 2018, primarily due to growth in homeowners and complementary products such as automobiles and valuables ($26 million) and the non-renewal of a quota share reinsurance treaty in the second quarter of 2017 covering the acquired Fireman's Fund homeowners and automobile businesses ($38 million).

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• Net premiums written in our North America Agricultural Insurance segment increased$47 million for the three months ended March 31, 2018, primarily due to an increase in MPCI premium which was driven by new business and the year-over-year impact of the premium sharing formulas under the U.S. government. Under the MPCI profit and loss calculation, we cede more premiums to the government during profitable years. In the prior year, the program was more profitable which resulted in higher cessions compared to the first quarter of 2018.

• Net premiums written in our Overseas General Insurance segment increased$172 million, or $33 million on a constant-dollar basis, for the three months ended March 31, 2018, driven by growth in personal lines and accident and health (A&H) lines in Asia and Latin America. In addition, P&C lines growth was primarily in small commercial property and general casualty lines reflecting new business principally in Asia, and in middle market driven by new business and rate increases. This growth was partially offset by declines in large account business.

• Net premiums written in our Global Reinsurance segment decreased $6 million for the three months ended March 31, 2018, as the prior year included a $7 million favorable non-recurring reinstatement premium adjustment related to prior period loss development. Net premiums written increased $1 million excluding the non-recurring adjustment.

• Net premiums written in our Life Insurance segment increased $35 million for the three months ended March 31, 2018, primarily due to growth in our Asian international life operations and Combined Insurance supplemental A&H program business. This growth was offset somewhat by our life reinsurance business, which continues to decline as no new life reinsurance business is currently being written.

Net Premiums Earned

Net premiums earned for short-duration contracts, typically P&C contracts, generally reflect the portion of net premiums written that were recorded as revenues for the period as the exposure periods expire. Net premiums earned for long-duration contracts, typically traditional life contracts, generally are recognized as earned when due from policyholders. Net premiums earned increased$255 million, or $129 million on a constant-dollar basis, for the three months ended March 31, 2018 due to the same factors driving the increase in net premiums written as described above.

P&C Combined Ratio

In evaluating our segments excluding Life Insurance, we use the P&C combined ratio, the loss and loss expense ratio, the policy acquisition cost ratio, and the administrative expense ratio. We calculate these ratios by dividing the respective expense amounts by net premiums earned. We do not calculate these ratios for the Life Insurance segment as we do not use these measures to monitor or manage that segment. The P&C combined ratio is determined by adding the loss and loss expense ratio, the policy acquisition cost ratio, and the administrative expense ratio. A P&C combined ratio under 100 percent indicates underwriting income, and a combined ratio exceeding 100 percent indicates underwriting loss.

The following table presents the components of the P&C combined ratio:

	Three Months Ended
	March 31
	2018		2017
Loss and loss expense ratio	60.0	%	57.4	%
Policy acquisition cost ratio	20.6	%	20.5	%
Administrative expense ratio	9.5	%	9.6	%
P&C Combined Ratio	90.1	%	87.5	%

The loss and loss expense ratio increased 2.6 percentage points for the three months ended March 31, 2018, due to higher catastrophe losses and lower favorable prior period development. Refer to the current accident year loss and loss expense ratio discussion below for more information.

Policy acquisition costs consist of commissions, premium taxes, and certain underwriting costs directly related to the successful acquisition of a new or renewal insurance contract. Our policy acquisition cost ratio remained relatively flat for the three months ended March 31, 2018.

Our administrative expense ratio remained relatively flat for the three months ended March 31, 2018.

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The following table presents pre-tax catastrophe losses and pre-tax prior period development, net of related reinstatement premiums:

	Three Months Ended
	March 31
(in millions of U.S dollars)	2018		2017
Catastrophe losses, pre-tax	$	380	$	206
Favorable prior period development net of related reinstatement premiums, pre-tax	$	209	$	231

We generally define catastrophe loss events consistent with the definition of the Property Claims Service (PCS) for events in the U.S. and Canada. PCS defines a catastrophe as an event that causes damage of $25 million or more in insured property losses and affects a significant number of insureds. For events outside of the U.S. and Canada, we generally use a similar definition.

	Catastrophe Loss Charge by Event
	North America Commercial P&C Insurance		North America Personal P&C Insurance		North America Agricultural Insurance		Overseas General Insurance		Global Reinsurance		Total Consolidated
Three Months Ended
March 31, 2018
(in millions of U.S. dollars)
Gross losses
Northeast winter storms	$	57	$	171	$	1	$	—	$	2	$	231
California mudslides	4		177		—		1		—		182
Other	24		31		—		21		—		76
Total	$	85	$	379	$	1	$	22	$	2	$	489
Net losses
Northeast winter storms	$	53	$	139	$	1	$	—	$	2	$	195
California mudslides	4		120		—		1		—		125
Other	21		25		—		14		—		60
Total	$	78	$	284	$	1	$	15	$	2	$	380
Reinstatement premiums	—		—		—		—		—		—
Total before income tax	$	78	$	284	$	1	$	15	$	2	$	380
Income tax benefit											$	77
Total after income tax											$	303

Prior period development (PPD) arises from changes to loss estimates recognized in the current year that relate to loss events that occurred in previous calendar years and excludes the effect of losses from the development of earned premium from previous accident years. Favorable prior period development was $209 million for the three months ended March 31, 2018 compared to $231 million in the prior year. The favorable prior period development for the three months ended March 31, 2018, included $106 million related to the 2017 catastrophic events. Refer to the Prior Period Development section in Note 4 to the Consolidated Financial Statements for additional information.

Current Accident Year (CAY) Loss Ratio excluding CATs and CAY P&C Combined Ratio excluding CATs

For these measures, the numerator includes losses and loss expenses adjusted to exclude CATs and PPD. In addition, the denominator includes net premiums earned adjusted to exclude the amount of reinstatement premiums (expensed) collected. Reinstatement premiums are additional fully earned, prorated premiums payable to reinsurers to restore coverage that has been reduced by reinsurance loss payments.

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The following table presents the CAY loss and loss expense ratio, excluding CATs and related reinstatement premiums (CAY loss ratio excluding CATs):

	Three Months Ended
	March 31
	2018		2017
Loss and loss expense ratio	60.0	%	57.4	%
Catastrophe losses and related reinstatement premiums	(5.8	)%	(3.3	)%
Prior period development net of related reinstatement premiums	3.5	%	4.0	%
CAY loss ratio excluding catastrophe losses	57.7	%	58.1	%

The CAY loss ratio excluding CATs decreased0.4 percentage points for the three months ended March 31, 2018, primarily due to the following:

• A change in the mix of business in our Overseas General Insurance segment towards countries that have a lower loss ratio and a higher acquisition cost ratio (0.2 percentage points);

• Integration-related claims handling expense savings realized (0.2 percentage points);

• Partially offset by non-catastrophe weather related (i.e., wind and water) and fire related large losses in our North America Personal P&C Insurance segment (0.2 percentage points).

The following table presents the CAY P&C combined ratio excluding CATs:

	Three Months Ended
	March 31
	2018		2017
CAY Loss and loss expense ratio ex CATs	57.7	%	58.1	%
CAY Policy acquisition cost ratio ex CATs	20.5	%	20.3	%
CAY Administrative expense ratio ex CATs	9.4	%	9.6	%
CAY P&C combined ratio ex CATs	87.6	%	88.0	%

P&C Combined Ratio with a Normal Level of CATs and CAY P&C Combined Ratio with a Normal Level of CATs

These measures include the level of CATs that we expected. Refer to the Non-GAAP Reconciliation section for the definition and determination of “normal level of CATs.” We believe that these measures are meaningful and provide a better indication of our underwriting performance as the portion of CATs intended to be covered by the premiums over time is retained in the calculation. These measures more appropriately align the numerator with a normal level of CATs to the denominator which includes the net earned premium on policies with exposures to that business.

The CAY P&C combined ratio with a normal level of CATs measure is further adjusted to exclude the impact of prior period development. We believe it is useful to exclude PPD as these unexpected loss developments on historical reserves are not indicative of our underlying performance when looking at the current accident year results.

	Three Months Ended
	March 31
	2018		2017
P&C Combined Ratio	90.1	%	87.5	%
Less: CATs above normal level	2.7	%	0.1	%
P&C combined ratio with a normal level of CATs	87.4	%	87.4	%
Less: Prior period development net of related reinstatement premiums	(3.3	)%	(3.8	)%
CAY P&C Combined ratio with a normal level of CATs	90.7	%	91.2	%

Policy benefits

Policy benefits represent losses on contracts classified as long-duration and generally include accident and supplemental health products, term and whole life products, endowment products, and annuities. Policy benefits also include gains and losses from changes in liabilities associated with our separate account assets that do not qualify for separate account reporting under

45

GAAP. Certain of our long duration contracts are supported by assets that do not qualify for separate account reporting under GAAP. These assets are classified as trading securities and reported in Other investments and the offsetting liabilities are reported in Future policy benefits in the Consolidated balance sheet. Fair value changes in separate account assets that do not qualify for separate account reporting under GAAP are reported in Other (income) expense and the offsetting movements in the liabilities are included in Policy benefits in the Consolidated statements of operations.

For the three months ended March 31, 2018 and 2017, Policy benefits were $151 million and $168 million, respectively, which included separate account liability losses of $6 million and $30 million, respectively. Excluding the separate account losses, Policy Benefits were $145 million and $138 million for the three months ended March 31, 2018 and 2017, respectively.

Refer to the respective sections for a discussion of Net investment income, Interest expense, Other (income) expense, Net realized gains and losses, Amortization of purchased intangibles, and Income tax expense.

Segment Operating Results – Three Months Ended March 31, 2018 and 2017

We operate through six business segments: North America Commercial P&C Insurance, North America Personal P&C Insurance, North America Agricultural Insurance, Overseas General Insurance, Global Reinsurance, and Life Insurance. For more information on our segments refer to “Segment Information” under Item 1 in our 2017 Form 10-K.

Corporate results primarily include income and expenses not attributable to reportable segments and loss and loss expenses of asbestos and environmental (A&E) liabilities and certain other run-off exposures.

North America Commercial P&C Insurance

The North America Commercial P&C Insurance segment comprises operations that provide property and casualty (P&C) insurance and services to large, middle market, and small commercial businesses in the U.S., Canada, and Bermuda. This segment includes our North America Major Accounts and Specialty Insurance division (principally large corporate accounts and wholesale business), and the North America Commercial Insurance division (principally middle market and small commercial accounts).

	Three Months Ended
	March 31						% Change
(in millions of U.S. dollars, except for percentages)	2018			2017			Q-18 vs. Q-17
Net premiums written (1)	$	2,812		$	2,730		3.0			%
Net premiums earned	3,029			3,041			(0.4			)%
Losses and loss expenses	1,908			1,860			2.6			%
Policy acquisition costs	472			487			(3.1			)%
Administrative expenses	231			231			—
Underwriting income	418			463			(9.7			)%
Net investment income	503			478			5.2			%
Other (income) expense	(6		)	4			NM
Segment income	$	927		$	937		(1.1			)%
Loss and loss expense ratio	63.0		%	61.2		%	1.8		pts
Policy acquisition cost ratio	15.6		%	16.0		%	(0.4	)	pts
Administrative expense ratio	7.6		%	7.6		%	—		pts
Combined ratio	86.2		%	84.8		%	1.4		pts

NM – not meaningful

⁽¹⁾ The 2017 net premiums written amount was revised to reflect the transfer of certain multinational accounts ($12 million) to the Overseas General Insurance segment to better align the reporting with the management of these businesses in 2018. There is no impact on a consolidated basis.

46

Premiums

Net premiums written increased$82 million for the three months ended March 31, 2018, primarily due to growth in our retail casualty and risk management businesses reflecting strong new business increases in both our large corporate and middle market accounts, and growth in our retail workers' compensation business due to stronger retention. In addition, our commercial segment experienced positive rate increases across a number of lines in both our Major account and middle market businesses. These increases were partially offset by planned portfolio management in certain of our retail and wholesale brokerage financial lines, and in our program business.

Net premiums earned decreased$12 million for the three months ended March 31, 2018 despite the increase in net premiums written, primarily due to the impact of the 2017 additional reinsurance and merger-related actions ($66 million). The net premiums written growth in the quarter also had a minimal impact to net premiums earned in the current quarter.

Combined Ratio

The loss and loss expense ratio increased1.8 percentage points for the three months ended March 31, 2018, due to lower favorable prior period development, partially offset by lower catastrophe losses. Refer to the current accident year loss and loss expense ratio discussion below for more information.

The policy acquisition cost ratio decreased0.4 percentage points for the three months ended March 31, 2018, primarily due to increased cessions under certain reinsurance agreements that resulted in higher ceded acquisition costs benefit than in the prior year.

The administrative expense ratio was flat for the three months ended March 31, 2018, as merit-based salary and inflationary increases were offset by integration-related expense savings realized.

The following table presents pre-tax catastrophe losses and pre-tax prior period development net of related reinstatement premiums:

	Three Months Ended
	March 31
(in millions of U.S. dollars)	2018		2017
Catastrophe losses, pre-tax	$	78	$	83
Favorable prior period development net of related reinstatement premiums, pre-tax	$	101	$	179

Catastrophe losses through March 31, 2018 and 2017 were primarily from severe weather-related events in the U.S.

The following table presents the current accident year loss and loss expense ratio, excluding catastrophe losses and related reinstatement premiums (CAY loss ratio excluding catastrophe losses):

	Three Months Ended
	March 31
	2018		2017
Loss and loss expense ratio	63.0	%	61.2	%
Catastrophe losses and related reinstatement premiums	(2.6	)%	(2.8	)%
Prior period development net of related reinstatement premiums	3.6	%	6.0	%
CAY loss ratio excluding catastrophe losses	64.0	%	64.4	%

The CAY loss ratio excluding catastrophe losses decreased0.4 percentage points for the three months ended March 31, 2018, primarily due to integration-related claims handling expense savings realized.

47

North America Personal P&C Insurance

The North America Personal P&C Insurance segment comprises operations that provide high net worth personal lines products, including homeowners and complementary products such as valuable articles, excess liability, automobile, and recreational marine insurance and services in the U.S. and Canada.

	Three Months Ended
	March 31						% Change
(in millions of U.S. dollars, except for percentages)	2018			2017			Q-18 vs. Q-17
Net premiums written	$	1,048		$	984		6.5			%
Net premiums earned	1,140			1,086			5.1			%
Losses and loss expenses	886			633			40.0			%
Policy acquisition costs	237			217			9.2			%
Administrative expenses	65			65			—
Underwriting income (loss)	(48		)	171			NM
Net investment income	59			55			7.3			%
Other (income) expense	—			1			NM
Amortization of purchased intangibles	3			3			—
Segment income	$	8		$	222		(96.4			)%
Loss and loss expense ratio	77.7		%	58.3		%	19.4		pts
Policy acquisition cost ratio	20.8		%	20.0		%	0.8		pts
Administrative expense ratio	5.7		%	5.9		%	(0.2	)	pts
Combined ratio	104.2		%	84.2		%	20.0		pts
NM – not meaningful

Premiums

Net premiums written increased$64 million for the three months ended March 31, 2018, primarily due to growth in homeowners and complementary products such as automobiles and valuables ($26 million) and the non-renewal of a quota share reinsurance treaty in the second quarter of 2017 covering the acquired Fireman's Fund homeowners and automobile businesses ($38 million).

Net premiums earned increased$54 million for the three months ended March 31, 2018, primarily due to the factors described above.

Combined Ratio

The loss and loss expense ratio increased19.4 percentage points for the three months ended March 31, 2018, due to higher catastrophe losses, partially offset by higher favorable prior period development. Refer to the current accident year loss and loss expense ratio discussion below for more information.

The policy acquisition cost ratio increased0.8 percentage points for the three months ended March 31, 2018, primarily due to the non-renewal of the Fireman's Fund quota share treaty which had a higher ceding commission.

The administrative expense ratio decreased0.2 percentage points for the three months ended March 31, 2018, primarily due to integration-related expense savings realized, partially offset by merit-based salary and inflationary increases.

48

The following table presents pre-tax catastrophe losses and pre-tax prior period development net of related reinstatement premiums:

	Three Months Ended
	March 31
(in millions of U.S. dollars)	2018		2017
Catastrophe losses, pre-tax	$	284	$	68
Favorable prior period development net of related reinstatement premiums, pre-tax	$	6	$	3

Catastrophe losses through March 31, 2018 were primarily from California mudslides and Northeast winter storms. Catastrophe losses through March 31, 2017 were primarily from severe weather-related events in the U.S.

The following table presents the current accident year loss and loss expense ratio, excluding catastrophe losses and related reinstatement premiums (CAY loss ratio excluding catastrophe losses):

	Three Months Ended
	March 31
	2018		2017
Loss and loss expense ratio	77.7	%	58.3	%
Catastrophe losses and related reinstatement premiums	(24.9	)%	(6.2	)%
Prior period development net of related reinstatement premiums	0.5	%	0.3	%
CAY loss ratio excluding catastrophe losses	53.3	%	52.4	%

The CAY loss ratio excluding catastrophe losses increased0.9 percentage points for the three months ended March 31, 2018, primarily due to a combination of non-catastrophe weather related (i.e., wind and water) and fire related large losses (1.3 percentage points), which were partially offset by integration-related claims handling expense savings realized.

49

North America Agricultural Insurance

The North America Agricultural Insurance segment comprises our North American based businesses that provide a variety of coverages in the U.S. and Canada including crop insurance, primarily Multiple Peril Crop Insurance (MPCI) and crop-hail through Rain and Hail Insurance Service, Inc. (Rain and Hail) as well as farm and ranch and specialty P&C commercial insurance products and services through our Chubb Agribusiness unit.

	Three Months Ended
	March 31						% Change
(in millions of U.S. dollars, except for percentages)	2018			2017			Q-18 vs. Q-17
Net premiums written	$	108		$	61		76.2		%
Net premiums earned	43			14			214.2		%
Losses and loss expenses (1)	(55		)	(73		)	(24.7		)%
Policy acquisition costs	(1		)	(1		)	—
Administrative expenses	(3		)	(5		)	(40.0		)%
Underwriting income	102			93			9.7		%
Net investment income	7			6			16.7		%
Amortization of purchased intangibles	7			7			—
Segment income	$	102		$	92		10.9		%
Loss and loss expense ratio	(127.6		)%	(539.4		)%	411.8	pts
Policy acquisition cost ratio	(3.1		)%	(4.2		)%	1.1	pts
Administrative expense ratio	(7.6		)%	(34.9		)%	27.3	pts
Combined ratio	(138.3		)%	(578.5		)%	440.2	pts

⁽¹⁾  Gains (losses) on crop derivatives were $2 million and nil for the three months ended March 31, 2018 and 2017, respectively. These gains (losses) are included in Net realized gains (losses) in our Consolidated statements of operations but are reclassified to Losses and loss expenses for purposes of presenting North America Agricultural Insurance underwriting income.

Premiums

Net premiums written increased$47 million for the three months ended March 31, 2018, primarily due to an increase in MPCI premium which was driven in part by higher new business and the year-over-year impact of the premium sharing formulas under the U.S. government. Under the MPCI profit and loss calculation, we cede additional premiums to the government during profitable years. In the prior year, the program was more profitable which resulted in higher cessions compared to the first quarter of 2018.

Net premiums earned increased$29 million for the three months ended March 31, 2018, due to the factors described above.

Combined Ratio

The loss and loss expense ratio increased411.8 percentage points for the three months ended March 31, 2018, due to lower favorable prior period development, partially offset by lower catastrophe losses. Refer to the current accident year loss and loss expense ratio discussion below for more information.

The policy acquisition cost ratio increased1.1 percentage points for the three months ended March 31, 2018, primarily due to higher MPCI direct commissions related to the 2017 crop year.

The administrative expense ratio was negative in the period, however, increased27.3 percentage points for the three months ended March 31, 2018, primarily due to the year-over-year impact of the Administrative and Operating (A&O) reimbursements on the MPCI business we recorded under the government program. The current year reimbursement was less than the prior year reimbursement.

50

The following table presents pre-tax catastrophe losses and pre-tax prior period development net of related reinstatement premiums:

	Three Months Ended
	March 31
(in millions of U.S. dollars)	2018		2017
Catastrophe losses, pre-tax	$	1	$	5
Favorable prior period development net of related reinstatement premiums, pre-tax	$	76	$	79

Catastrophe losses through March 31, 2018 and 2017 were primarily from our farm, ranch, and specialty P&C businesses.

For the three months ended March 31, 2018, net favorable prior period development was $76 million which included $112 million of favorable incurred losses and $4 million of lower acquisition costs due to lower than expected MPCI losses for the 2017 crop year, partially offset by a $40 million decrease in net premiums earned related to the MPCI profit and loss calculation formula. For the three months ended March 31, 2017, net favorable prior period development was $79 million, which included $135 million of favorable incurred losses and $5 million lower acquisition costs due to lower than expected MPCI losses for the 2016 crop year, partially offset by a $61 million decrease in net premiums earned related to the MPCI profit and loss calculation formula.

The following table presents the current accident year loss and loss expense ratio, excluding catastrophe losses and related reinstatement premiums (CAY loss ratio excluding catastrophe losses):

	Three Months Ended
	March 31
	2018		2017
Loss and loss expense ratio	(127.6	)%	(539.4	)%
Catastrophe losses and related reinstatement premiums	(1.5	)%	(39.5	)%
Prior period development net of related reinstatement premiums	198.0	%	654.7	%
CAY loss ratio excluding catastrophe losses	68.9	%	75.8	%

The CAY loss ratio excluding catastrophe losses decreased6.9 percentage points for the three months ended March 31, 2018, primarily due to the current quarter gain on our crop derivatives and improved underlying losses in the current year.

51

Overseas General Insurance

Overseas General Insurance segment comprises Chubb International and Chubb Global Markets (CGM). Chubb International comprises our commercial P&C traditional and specialty lines serving large corporations, middle market and small customers, A&H and traditional and specialty personal lines business serving local territories outside the U.S., Bermuda, and Canada. CGM, our London-based international commercial P&C excess and surplus lines business, includes Lloyd's of London (Lloyd's) Syndicate 2488. Chubb provides funds at Lloyd's to support underwriting by Syndicate 2488 which is managed by Chubb Underwriting Agencies Limited.

	Three Months Ended
	March 31						% Change
(in millions of U.S. dollars, except for percentages)	2018			2017			Q-18 vs. Q-17
Net premiums written (1)	$	2,384		$	2,212		7.8			%
Net premiums earned	2,107			1,936			8.8			%
Losses and loss expenses	1,078			1,071			0.7			%
Policy acquisition costs	588			529			11.2			%
Administrative expenses	239			245			(2.4			)%
Underwriting income (2)	202			91			122.0			%
Net investment income	151			148			2.0			%
Other (income) expense	7			(1		)	NM
Amortization of purchased intangibles	10			11			(9.1			)%
Segment income	$	336		$	229		46.7			%
Loss and loss expense ratio	51.1		%	55.3		%	(4.2	)	pts
Policy acquisition cost ratio	27.9		%	27.3		%	0.6		pts
Administrative expense ratio	11.4		%	12.7		%	(1.3	)	pts
Combined ratio	90.4		%	95.3		%	(4.9	)	pts

NM - not meaningful

⁽¹⁾  On a constant-dollar basis, for the three months ended March 31, 2018, net premiums written increased$33 million, or 1.4 percent. Amounts are calculated by translating prior period results using the same local currency rates as the comparable current period. The 2017 net premiums written amount was revised to reflect the transfer of certain multinational accounts ($12 million) from the North America Commercial P&C Insurance segment to better align the reporting with the management of these businesses in 2018. There is no impact on a consolidated basis.   

⁽²⁾  On a constant-dollar basis, for the three months ended March 31, 2018, underwriting income increased$99 million, or 96.8 percent. Amounts are calculated by translating prior period results using the same local currency rates as the comparable current period.

Premiums

Net premiums written increased$172 million, or $33 million on a constant-dollar basis, for the three months ended March 31, 2018, driven by growth in personal lines and accident and health (A&H) lines in Asia and Latin America. In addition, P&C lines growth was primarily in small commercial property and general casualty lines reflecting new business principally in Asia, and in middle market driven by new business and rate increases. This growth was partially offset by declines in large account business.

Net premiums earned increased$171 million, or $62 million on a constant-dollar basis, for the three months ended March 31, 2018, due to the factors described above.

52

Overseas General Insurance conducts business internationally and in most major foreign currencies. The following table presents a regional breakdown of Overseas General Insurance net premiums written:

	Three Months Ended March 31										% Change
(in millions of U.S. dollars, except for percentages)	2018		2018 % of Total		2017		2017 % of Total		C$ (1) 2017		Q-18 vs. Q-17		C$ (1) Q-18 vs. Q-17
Region
Europe	$	1,110	47	%	$	1,030	47	%	$	1,128	7.8	%	(1.6	)%
Latin America	528		22	%	497		22	%	507		6.2	%	4.1	%
Asia	657		28	%	577		26	%	604		13.9	%	8.8	%
Other (2)	89		3	%	108		5	%	112		(17.6	)%	(20.5	)%
Net premiums written	$	2,384	100	%	$	2,212	100	%	$	2,351	7.8	%	1.4	%

⁽¹⁾ On a constant-dollar basis. Amounts are calculated by translating prior period results using the same local currency exchange rates as the comparable current period. 

⁽²⁾ Combined International, Eurasia and Africa region, and other international. The 2017 net premiums written as reported and constant-dollar amounts were revised to reflect the transfer of certain multinational accounts ($12 million) from the North America Commercial P&C Insurance segment to better align the reporting with the management of these businesses in 2018. There is no impact on a consolidated basis.

Combined Ratio

The loss and loss expense ratio decreased 4.2 percentage points for the three months ended March 31, 2018, due to lower catastrophe losses and favorable prior period development in the current year compared to unfavorable prior period development in the prior year. Refer to the current accident year loss and loss expense ratio discussion below for more information.

The policy acquisition cost ratio increased0.6 percentage points for the three months ended March 31, 2018, primarily due to a change in the mix of business towards countries that have a lower loss ratio and a higher acquisition cost ratio (0.5 percentage points), and the reduced benefit of lower cede commissions (0.1 percentage points).

The administrative expense ratio decreased1.3 percentage points for the three months ended March 31, 2018, primarily due to integration-related expense savings realized (0.5 percentage points), lower employee benefit related expenses (0.4 percentage points) and the favorable impact of higher net premiums earned in the current quarter, partially offset by the impact of increased spending to support growth initiatives.

The following table presents pre-tax catastrophe losses and pre-tax prior period development net of related reinstatement premiums:

	Three Months Ended March 31
(in millions of U.S. dollars)	2018		2017
Catastrophe losses, pre-tax	$	15	$	50
Favorable (unfavorable) prior period development net of related reinstatement premiums, pre-tax	$	22	$	(12	)

Catastrophe losses through March 31, 2018 and 2017 were primarily from the following events:

• 2018: Severe weather-related events in Europe

• 2017: Cyclone Debbie in Australia

The following table presents the current accident year loss and loss expense ratio, excluding catastrophe losses and related reinstatement premiums (CAY loss ratio excluding catastrophe losses):

	Three Months Ended
	March 31
	2018		2017
Loss and loss expense ratio	51.1	%	55.3	%
Catastrophe losses and related reinstatement premiums	(0.7	)%	(2.6	)%
Prior period development net of related reinstatement premiums	1.0	%	(0.6	)%
CAY loss ratio excluding catastrophe losses	51.4	%	52.1	%

53

The CAY loss ratio excluding catastrophe losses decreased0.7 percentage points for the three months ended March 31, 2018, primarily due to a change in the mix of business towards countries that have a lower loss ratio and a higher acquisition cost ratio (0.9 percentage points) and integration-related claims handling expense savings realized (0.1 percentage points).

Global Reinsurance

The Global Reinsurance segment represents our reinsurance operations comprising Chubb Tempest Re Bermuda, Chubb Tempest Re USA, Chubb Tempest Re International, and Chubb Tempest Re Canada. Global Reinsurance markets its reinsurance products worldwide under the Chubb Tempest Re brand name and provides a broad range of traditional reinsurance coverage to a diverse array of primary P&C companies.

	Three Months Ended
	March 31						% Change
(in millions of U.S. dollars, except for percentages)	2018			2017			Q-18 vs. Q-17
Net premiums written	$	193		$	199		(3.0		)%
Net premiums earned	168			189			(11.0		)%
Losses and loss expenses	67			94			(28.7		)%
Policy acquisition costs	40			51			(21.6		)%
Administrative expenses	10			10			—
Underwriting income	51			34			50.0		%
Net investment income	64			62			3.2		%
Other (income) expense	(7		)	—			NM
Segment income	$	122		$	96		27.1		%
Loss and loss expense ratio	40.1		%	49.6		%	(9.5)	pts
Policy acquisition cost ratio	23.6		%	26.8		%	(3.2)	pts
Administrative expense ratio	5.8		%	5.7		%	0.1	pts
Combined ratio	69.5		%	82.1		%	(12.6)	pts

NM - not meaningful

Premiums

Net premiums written decreased $6 million for the three months ended March 31, 2018, as the prior year included a $7 million favorable non-recurring reinstatement premium adjustment related to prior period loss development. Net premiums written increased $1 million excluding the non-recurring adjustment as new business written was approximately offset by lower renewals.

Net premiums earned decreased $21 million for the three months ended March 31, 2018, primarily due to the factors described above as well as $13 million of short-term treaties earned in the prior year that were written in 2016 and 2017.

Combined Ratio

The loss and loss expense ratio decreased9.5 percentage points for the three months ended March 31, 2018, due to favorable prior period development in the current year compared to unfavorable prior period development in the prior year, partially offset by catastrophe losses in the current year. Refer to the current accident year loss and loss expense ratio discussion below for more information.

The policy acquisition cost ratio decreased3.2 percentage points for the three months ended March 31, 2018, primarily due to a shift in the mix of business towards more casualty business which generally has a higher loss ratio and lower acquisition cost ratio.

The administrative expense ratio was relatively flat for the three months ended March 31, 2018.

54

The following table presents pre-tax catastrophe losses and pre-tax prior period development net of related reinstatement premiums:

	Three Months Ended
	March 31
(in millions of U.S dollars)	2018			2017
Catastrophe losses, pre-tax	$	2		$	—
Favorable (unfavorable) prior period development net of related reinstatement premiums, pre-tax (1)	$	14		$	(8	)
(1) Favorable (unfavorable) reinstatement premiums receivable on prior period development - pre-tax	$	(1	)	$	7

Catastrophe losses through March 31, 2018 were from severe weather-related events in the U.S.

The following table presents the current accident year loss and loss expense ratio, excluding catastrophe losses and related reinstatement premiums (CAY loss ratio excluding catastrophe losses):

	Three Months Ended
	March 31
	2018		2017
Loss and loss expense ratio	40.1	%	49.6	%
Catastrophe losses and related reinstatement premiums	(1.2	)%	—
Prior period development net of related reinstatement premiums	8.8	%	(6.4	)%
CAY loss ratio excluding catastrophe losses	47.7	%	43.2	%

The CAY loss ratio excluding catastrophe losses increased4.5 percentage points for the three months ended March 31, 2018, due to a shift in the mix of business towards more casualty business which generally has a higher loss ratio and lower acquisition cost ratio.

55

Life Insurance

The Life Insurance segment comprises Chubb's international life operations, Chubb Tempest Life Re (Chubb Life Re), and the North American supplemental A&H and life business of Combined Insurance. We assess the performance of our life business based on Life Insurance underwriting income, which includes Net investment income and (Gains) losses from fair value changes in separate account assets that do not qualify for separate account reporting under GAAP.

	Three Months Ended
	March 31						% Change
(in millions of U.S. dollars, except for percentages)	2018			2017			Q-18 vs. Q-17
Net premiums written	$	559		$	524		6.7	%
Net premiums earned	540			506			6.8	%
Losses and loss expenses	205			193			6.2	%
Policy benefits (1)	151			168			(10.1	)%
(Gains) losses from fair value changes in separate account assets (1)	(6		)	(30		)	(80.0	)%
Policy acquisition costs	128			114			12.3	%
Administrative expenses	78			72			8.3	%
Net investment income	83			75			10.7	%
Life Insurance underwriting income	67			64			4.7	%
Other (income) expense (1)	2			1			100.0	%
Amortization of purchased intangibles	1			1			—
Segment income	$	64		$	62		3.2	%

⁽¹⁾  (Gains) losses from fair value changes in separate account assets that do not qualify for separate account reporting under GAAP have been reclassified from Other income (expense) for purposes of presenting Life Insurance underwriting income. The offsetting movement in the separate account liabilities is included in Policy benefits.

Premiums

Net premiums written increased $35 million for the three months ended March 31, 2018, primarily due to growth in our Asian international life operations and Combined Insurance supplemental A&H program business. This growth was offset by our life reinsurance business, which continues to decline as no new life reinsurance business is currently being written.

Deposits

The following table presents deposits collected on universal life and investment contracts:

	Three Months Ended
	March 31						% Change
(in millions of U.S. dollars, except for percentages)	2018		2017		C$ (1) 2017		Q-18 vs. Q-17		C$ (1)Q-18 vs. Q-17
Deposits collected on Universal life and investment contracts	$	379	$	310	$	324	22.0	%	16.9	%

⁽¹⁾ On a constant-dollar basis. Amounts are calculated by translating prior period results using the same local currency exchange rates as the comparable current period. 

Deposits collected on universal life and investment contracts (life deposits) are not reflected as revenues in our Consolidated statements of operations in accordance with GAAP. New life deposits are an important component of production, and although they do not significantly affect current period income from operations, they are key to our efforts to grow our business. Life deposits collected increased for the three ended March 31, 2018, due to growth in Taiwan, Korea, and Vietnam.

Life Insurance underwriting income

Life Insurance underwriting income increased $3 million for the three months ended March 31, 2018, primarily due to an increase in net investment income.

56

Corporate

Corporate results primarily include income and expenses not attributable to reportable segments and loss and loss expenses of asbestos and environmental (A&E) liabilities.

	Three Months Ended
	March 31						% Change
(in millions of U.S. dollars, except for percentages)	2018			2017			Q-18 vs. Q-17
Losses and loss expenses	$	11		$	11		—
Administrative expenses	72			58			24.1	%
Underwriting loss	83			69			20.3	%
Net investment income (loss)	(61		)	(79		)	(22.8	)%
Interest expense	157			154			1.9	%
Net realized gains (losses)	(4		)	(7		)	(42.9	)%
Other (income) expense	(37		)	(45		)	(17.8	)%
Amortization expense of purchased intangibles	64			42			52.4	%
Chubb integration expenses	10			111			(91.0	)%
Income tax expense	135			128			5.5	%
Net loss	$	(477	)	$	(545	)	(12.5	)%

Losses and loss expenses in both years were primarily related to unallocated loss adjustment expenses of the A&E claim operations.

Administrative expenses increased$14 million for the three months ended March 31, 2018 from higher global advertising expense and increased spending to support growth.

Chubb integration expenses are one-time in nature and are not related to the on-going business activities of the segments. The Chief Executive Officer does not manage segment results or allocate resources to segments when considering these costs and they are therefore excluded from our definition of segment income. Chubb integration expenses were $10 million and $111 million for the three months ended March 31, 2018 and 2017, respectively, and principally consisted of personnel-related expenses ($5 million and $81 million, respectively).

Refer to the respective sections for a discussion of Net investment income, Interest expense, Other (income) expense, Net realized gains and losses, Amortization of purchased intangibles, and Income tax expense.

Effective Income Tax Rate

Our effective income tax rate, which we calculate as income tax expense divided by income before income tax, is dependent upon the mix of earnings from different jurisdictions with various tax rates. A change in the geographic mix of earnings would change the effective income tax rate.

For the three months ended March 31, 2018 and 2017, our effective rate was 11.1 percent and 10.5 percent, respectively. The effective income tax rate of 11.1 percent in the current year was higher compared to the prior year primarily from a lower tax benefit due to a reduction in integration expenses. This increase was offset by the favorable impact of the reduced U.S. corporate income tax rate that resulted from the passage of the Tax Cuts and Jobs Act and a higher tax benefit from higher catastrophe losses in the U.S. in the current year.

The 10.5 percent effective tax rate in the prior year included a benefit of $50 million, comprised of a non-recurring reduction to income tax expense related to an accounting election for certain discrete investments that resulted in the release of the associated deferred tax liability ($25 million) and the adoption of stock compensation guidance related to excess tax benefits of $25 million.

57

The lower tax rates attributed to our foreign operations primarily reflect the lower corporate tax rates that prevail outside of the U.S. During the three months ended March 31, 2018, approximately 63 percent of our total pre-tax income was tax effected based on these lower rates compared with 57 percent for the three months ended March 31, 2017. The significant lower taxing jurisdictions outside of the U.S. include the U.K., Switzerland, and Bermuda with effective federal income tax rates in those countries of 19.0 percent, 7.83 percent, and 0.0 percent, respectively.

Non-GAAP Reconciliation

P&C performance metrics are non-GAAP financial measures and comprise consolidated operating results (including Corporate) and exclude the operating results of the Life Insurance segment. We believe that these measures are useful and meaningful to investors as they are used by management to assess the company’s P&C operations which are the most economically similar.  We exclude the Life Insurance segment because the results of this business do not always correlate with the results of our P&C operations.   

The P&C combined ratio is a non-GAAP financial measure and includes the impact of realized gains and losses on crop derivatives. These derivatives were purchased to provide economic benefit, in a manner similar to reinsurance protection, in the event that a significant decline in commodity pricing will impact underwriting results. We view gains and losses on these derivatives as part of the results of our underwriting operations.

CAY P&C combined ratio excluding the impact of catastrophe losses (CATs) and prior period development (PPD) is a non-GAAP financial measure. The combined ratio numerator includes adjusted losses and loss expenses, policy acquisition costs, and administrative expenses. The denominator includes net premiums earned adjusted to exclude the amount of reinstatement premiums (expensed) collected. In periods where there are adjustments on loss sensitive policies, these adjustments are excluded from PPD and net earned premiums when calculating the ratios. We exclude catastrophe losses as they are not predictable as to timing and amount and PPD as these unexpected loss developments on historical reserves are not indicative of our current underwriting performance. We believe that excluding the impact of CATs and PPD provides a better evaluation of our underwriting performance and enhances the understanding of the trends in our property & casualty business that may be obscured by these items. This measure is commonly reported among our peers and allows for comparison to other property & casualty insurance companies.

The P&C combined ratio with a normal level of CATs and the CAY P&C combined ratio with a normal level of CATs are non-GAAP financial measures which include a level of CATs that we expected. A normal level of CATs is determined based on various factors, including historical experience, seasonal patterns, and consideration of both modeled CATs (e.g., windstorm and earthquake) as well as non-modeled CATs (e.g., wildfires, floods and freeze). For the three months ended March 31, 2018 and 2017, based on these and other factors, the normal level of CATs that we expected was $205 million and $201 million, respectively, resulting in an excess level of CATs of $175 million and $5 million, respectively. We believe that these measures are meaningful and provide a better indication of our underwriting performance as the portion of CATs intended to be covered by the premiums over time is retained in the calculation. These measures more appropriately align the numerator with a normal level of CATs to the denominator which includes the net earned premium on policies with exposures to that business. The CAY P&C combined ratio with a normal level of CATs excludes PPD as these unexpected loss developments on historical reserves are not indicative of our current underwriting performance when looking at the current accident year results. See page 45 for a reconciliation to the most directly comparable GAAP measures.

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The following tables present the calculation of combined ratio, as reported, to P&C combined ratio, adjusted for catastrophe losses (CATs) and PPD:

		North America Commercial P&C Insurance			North America Personal P&C Insurance			North America Agricultural Insurance			Overseas General Insurance			Global Reinsurance			Corporate			Total P&C
Three Months Ended
March 31, 2018
(in millions of U.S. dollars except for ratios)
Numerator
Losses and loss expenses
Losses and loss expenses		$	1,908		$	886		$	(53	)	$	1,078		$	67		$	11		$	3,897
Realized (gains) losses on crop derivatives		—			—			(2		)	—			—			—			(2		)
Adjusted losses and loss expenses	A	$	1,908		$	886		$	(55	)	$	1,078		$	67		$	11		$	3,895
Catastrophe losses		(78		)	(284		)	(1		)	(15		)	(2		)	—			(380		)
PPD and related adjustments
PPD, net of related adjustments - favorable (unfavorable)		101			6			76			22			14			(10		)	209
Net earned premium adjustments on PPD - unfavorable (favorable)		—			—			40			—			1			—			41
Expense adjustments - unfavorable (favorable)		6			—			(4		)	—			—			—			2
PPD reinstatement premiums		4			—			—			—			—			—			4
PPD - gross of related adjustments - favorable (unfavorable)		111			6			112			22			15			(10		)	256
Loss and loss expense ex CATs and PPD	B	$	1,941		$	608		$	56		$	1,085		$	80		$	1		$	3,771
Policy acquisition costs and administrative expenses
Policy acquisition costs and administrative expenses	C	$	703		$	302		$	(4	)	$	827		$	50		$	72		$	1,950
Expense adjustments - favorable (unfavorable)		(6		)	—			4			—			—			—			(2		)
Policy acquisition costs and administrative expenses, adjusted	D	$	697		$	302		$	—		$	827		$	50		$	72		$	1,948
Denominator
Net premiums earned	E	$	3,029		$	1,140		$	43		$	2,107		$	168					$	6,487
Net earned premium adjustments on PPD - unfavorable (favorable)		—			—			40			—			1						41
Reinstatement premiums expensed on PPD		4			—			—			—			—						4
Net premiums earned excluding adjustments	F	$	3,033		$	1,140		$	83		$	2,107		$	169					$	6,532
P&C Combined ratio
Losses and loss expense ratio	A/E	63.0		%	77.7		%	(127.6		)%	51.1		%	40.1		%				60.0		%
Policy acquisition costs and administrative expense ratio	C/E	23.2		%	26.5		%	(10.7		)%	39.3		%	29.4		%				30.1		%
P&C Combined ratio		86.2		%	104.2		%	(138.3		)%	90.4		%	69.5		%				90.1		%
CAY P&C Combined ratio - ex CATs
Loss and loss expense ratio, adjusted	B/F	64.0		%	53.3		%	68.9		%	51.4		%	47.7		%				57.7		%
Policy acquisition costs and administrative expense ratio, adjusted	D/F	23.0		%	26.4		%	(1.2		)%	39.3		%	29.3		%				29.9		%
CAY P&C Combined ratio - ex CATs		87.0		%	79.7		%	67.7		%	90.7		%	77.0		%				87.6		%
Combined ratio
Combined ratio																				90.1		%
Add: impact of gains and losses on crop derivatives																				—
P&C Combined ratio																				90.1		%
Note: The ratios above are calculated using whole U.S. dollars. Accordingly, calculations using rounded amounts may differ. Letters A, B, C, D, E, and F included in the table are references for calculating the ratios above.

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		North America Commercial P&C Insurance			North America Personal P&C Insurance			North America Agricultural Insurance			Overseas General Insurance			Global Reinsurance			Corporate			Total P&C
Three Months Ended
March 31, 2017
(in millions of U.S. dollars except for ratios)
Numerator
Losses and loss expenses
Losses and loss expenses		$	1,860		$	633		$	(73	)	$	1,071		$	94		$	11		$	3,596
Realized (gains) losses on crop derivatives		—			—			—			—			—			—			—
Adjusted losses and loss expenses	A	$	1,860		$	633		$	(73	)	$	1,071		$	94		$	11		$	3,596
Catastrophe losses		(83		)	(68		)	(5		)	(50		)	—			—			(206		)
PPD and related adjustments
PPD, net of related adjustments - favorable (unfavorable)		179			3			79			(12		)	(8		)	(10		)	231
Net earned premium adjustments on PPD - unfavorable (favorable)		—			—			61			—			(7		)	—			54
Expense adjustments - unfavorable (favorable)		—			—			(5		)	—			—			—			(5		)
PPD reinstatement premiums		9			—			—			—			—			—			9
PPD - gross of related adjustments - favorable (unfavorable)		188			3			135			(12		)	(15		)	(10		)	289
Loss and loss expense ex CATs and PPD	B	$	1,965		$	568		$	57		$	1,009		$	79		$	1		$	3,679
Policy acquisition costs and administrative expenses
Policy acquisition costs and administrative expenses	C	$	718		$	282		$	(6	)	$	774		$	61		$	58		$	1,887
Expense adjustments - favorable (unfavorable)		—			—			5			—			—			—			5
Policy acquisition costs and administrative expenses, adjusted	D	$	718		$	282		$	(1	)	$	774		$	61		$	58		$	1,892
Denominator
Net premiums earned	E	$	3,041		$	1,086		$	14		$	1,936		$	189					$	6,266
Net earned premium adjustments on PPD - unfavorable (favorable)		—			—			61			—			(7		)				54
Reinstatement premiums expensed on PPD		9			—			—			—			—						9
Net premiums earned excluding adjustments	F	$	3,050		$	1,086		$	75		$	1,936		$	182					$	6,329
P&C Combined ratio
Losses and loss expense ratio	A/E	61.2		%	58.3		%	(539.4		)%	55.3		%	49.6		%				57.4		%
Policy acquisition costs and administrative expense ratio	C/E	23.6		%	25.9		%	(39.1		)%	40.0		%	32.5		%				30.1		%
P&C Combined ratio		84.8		%	84.2		%	(578.5		)%	95.3		%	82.1		%				87.5		%
CAY P&C Combined ratio - ex CATs
Loss and loss expense ratio, adjusted	B/F	64.4		%	52.4		%	75.8		%	52.1		%	43.2		%				58.1		%
Policy acquisition costs and administrative expense ratio, adjusted	D/F	23.5		%	25.9		%	(1.2		)%	40.0		%	33.8		%				29.9		%
CAY P&C Combined ratio - ex CATs		87.9		%	78.3		%	74.6		%	92.1		%	77.0		%				88.0		%
Combined ratio
Combined ratio																				87.5		%
Add: impact of gains and losses on crop derivatives																				—
P&C Combined ratio																				87.5		%
Note: The ratios above are calculated using whole U.S. dollars. Accordingly, calculations using rounded amounts may differ. Letters A, B, C, D, E, and F included in the table are references for calculating the ratios above.

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Other Income and Expense Items

	Three Months Ended
	March 31
(in millions of U.S. dollars)	2018			2017
Equity in net (income) loss of partially-owned entities	$	(59	)	$	(53	)
(Gains) losses from fair value changes in separate account assets (1)	(6		)	(30		)
Federal excise and capital taxes	3			3
Other	15			10
Other (income) expense	$	(47	)	$	(70	)

⁽¹⁾   Related to (gains) losses from fair value changes in separate account assets that do not qualify for separate account reporting under GAAP.

Other (income) expense includes equity in net (income) loss of partially-owned entities, which includes our share of net (income) loss related to partially-owned investment companies (private equity) and partially-owned insurance companies. Also included in Other (income) expense are (Gains) losses from fair value changes in separate account assets that do not qualify for separate account reporting under GAAP. The offsetting movement in the separate account liabilities is included in Policy benefits in the Consolidated statements of operations. Certain federal excise and capital taxes incurred as a result of capital management initiatives are included in Other (income) expense as these are considered capital transactions and are excluded from underwriting results.

Amortization of purchased intangibles and Other amortization

Amortization expense related to purchased intangibles was $85 million for the three months ended March 31, 2018, compared with $64 million in the prior year period. The increase in amortization expense of purchased intangibles reflects higher intangible amortization expense related to agency distribution relationships and renewal rights and lower amortization benefit from the fair value adjustment on Unpaid losses and loss expenses.

Amortization expense for the remainder of 2018 is expected to be $252 million, or $84 million each quarter.

The following table presents, as of March 31, 2018, the estimated pre-tax amortization expense (benefit) of purchased intangibles, at current foreign currency exchange rates, for the second through fourth quarters of 2018 and the next five years:

	Associated with the Chubb Corp Acquisition
For the Years Ending December 31 (in millions of U.S. dollars)	Agency distribution relationships and renewal rights		Internally developed technology		Fair value adjustment on Unpaid losses and loss expenses			Total (1)		Other intangible assets (2)		Total Amortization of purchased intangibles
Second quarter of 2018	$	82	$	8	$	(26	)	$	64	$	20	$	84
Third quarter of 2018	82		8		(26		)	64		20		84
Fourth quarter of 2018	82		8		(26		)	64		20		84
2019	284		—		(63		)	221		75		296
2020	242		—		(36		)	206		70		276
2021	218		—		(20		)	198		64		262
2022	198		—		(14		)	184		57		241
2023	179		—		(7		)	172		52		224
Total	$	1,367	$	24	$	(218	)	$	1,173	$	378	$	1,551

⁽¹⁾  Recorded in Corporate.

⁽²⁾  Recorded in applicable segment(s) that acquired the intangible assets.

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Reduction of deferred tax liability associated with intangible assets related to Other intangible assets (excluding the fair value adjustment on Unpaid losses and loss expense)

At March 31, 2018, the deferred tax liability associated with Other intangible assets (excluding the fair value adjustment on Unpaid losses and loss expense) was $1,417 million.

The following table presents, as of March 31, 2018, the expected reduction of the deferred tax liability associated with Other intangible assets (which reduces as agency distribution relationships and renewal rights, internally developed technology, and other intangible assets amortize), at current foreign currency exchange rates, for the second through fourth quarters of 2018 and for the next five years:

For the Years Ending December 31 (in millions of U.S. dollars)	Reduction to deferred tax liability associated with intangible assets
Second quarter of 2018	$	24
Third quarter of 2018	24
Fourth quarter of 2018	24
2019	79
2020	69
2021	62
2022	56
2023	51
Total	$	389

Amortization of the fair value adjustment on acquired invested assets and assumed long-term debt

The following table presents at March 31, 2018, the expected amortization expense of the fair value adjustment on acquired invested assets, at current foreign currency exchange rates, and the expected amortization benefit from the amortization of the fair value adjustment on assumed long-term debt for the second through fourth quarters of 2018 and for the next five years:

	Amortization (expense) benefit of the fair value adjustment on
For the Years Ending December 31 (in millions of U.S. dollars)	Acquired invested assets (1)			Assumed long-term debt (2)
Second quarter of 2018	$	(65	)	$	9
Third quarter of 2018	(62		)	6
Fourth quarter of 2018	(60		)	5
2019	(220		)	21
2020	(190		)	21
2021	(160		)	21
2022	(17		)	21
2023	—			21
Total	$	(774	)	$	125

⁽¹⁾  Recorded as a reduction to Net investment income in the Consolidated statements of operations.

⁽²⁾  Recorded as a reduction to Interest expense in the Consolidated statements of operations.

The estimate of amortization expense of the fair value adjustment on acquired invested assets could vary materially based on current market conditions, bond calls, overall duration of the acquired investment portfolio, and foreign exchange.

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Interest Expense

The following table presents the estimated interest expense for the remainder of 2018 based on our existing debt obligations as well as fees based on our expected usage of certain facilities including letters of credit, collateral fees, and repurchase agreements.

				Estimated Interest Expense
	First quarter			Second quarter			Third quarter			Fourth quarter			Full Year
(in millions of U.S. dollars)	2018			2018			2018			2018			2018
Fixed interest expense based on outstanding debt	$	140		$	131		$	126		$	125		$	522
Variable interest expense based on expected usage	29			35			37			39			140
Adjusted interest expense	$	169		$	166		$	163		$	164		$	662
Amortization of the fair value of debt related to the Chubb Corp acquisition	(12		)	(9		)	(6		)	(5		)	(32		)
Total interest expense, including amortization of the fair value of debt	$	157		$	157		$	157		$	159		$	630

The estimated fixed interest expense, at current foreign currency exchange rates, is based on outstanding debt obligations during the period:

• We redeemed the $1.0 billion unsecured junior subordinated capital securities on April 6, 2018. No interest expense was considered for this debt after April 6, 2018.

• We plan to redeem the $600 million 5.75 percent senior note on May 15, 2018. No interest expense was considered for this debt after May 15, 2018.

• We plan to redeem the $100 million 6.6 percent senior note on August 15, 2018. No interest expense was considered for this debt after August 15, 2018.

The estimated variable interest expense is based on expected usage and may fluctuate. These interest expenses include: notional pools interest expense and fees on collateral, repurchase agreements and credit facilities.

Net Investment Income

	Three Months Ended
	March 31
(in millions of U.S. dollars)	2018			2017
Fixed maturities	$	772		$	730
Short-term investments	48			26
Equity securities	8			9
Other investments	19			19
Gross investment income (1)	847			784
Investment expenses	(41		)	(39		)
Net investment income (1)	$	806		$	745
(1)Includes amortization expense related to fair value adjustment of acquired invested assets related to the Chubb Corp acquisition	$	(71	)	$	(91	)

Net investment income is influenced by a number of factors including the amounts and timing of inward and outward cash flows, the level of interest rates, and changes in overall asset allocation. Net investment income increased 8.2 percent for the three months ended March 31, 2018, compared with the prior year period.The increase for the three months ended March 31, 2018 was primarily due to a higher average invested asset base and higher earnings on short-term investments.

Our average yield on invested assets for both the three months ended March 31, 2018 and 2017 was 3.4 percent, which is primarily driven by the yield on our fixed maturities. This compares to the average market yield, which represents the weighted

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average yield to maturity of our fixed income portfolio based on market prices of the holdings throughout the period, of 3.3 percent and 2.8 percent at March 31, 2018and 2017, respectively.

Net Realized and Unrealized Gains (Losses)

We take a long-term view with our investment strategy, and our investment managers manage our investment portfolio to maximize total return within certain specific guidelines designed to minimize risk. The majority of our investment portfolio is available for sale and reported at fair value. Our held to maturity investment portfolio is reported at amortized cost.

The effect of market movements on our fixed maturities portfolio impacts Net income (through Net realized gains (losses)) when securities are sold or when we record an Other-than-temporary impairment (OTTI) charge in Net income. For a further discussion related to how we assess OTTI for our fixed maturities, including credit-related OTTI, and the related impact on Net income, refer to Note 2 b) to the Consolidated Financial Statements. Effective January 1, 2018, we adopted new accounting guidance that requires the effect of changes in fair value of equity securities and cost-method private equity securities to be recognized immediately in net income (through realized gains (losses)). Additionally, Net income is impacted through the reporting of changes in the fair value of derivatives, including financial futures, options, swaps, and GLB reinsurance. Changes in unrealized appreciation and depreciation on available for sale securities, resulting from the revaluation of securities held, changes in cumulative foreign currency translation adjustment, and unrealized postretirement benefit liability adjustment, are reported as separate components of Accumulated other comprehensive income in Shareholders’ equity in the Consolidated balance sheets.

The following table presents our net realized and unrealized gains (losses):

	Three Months Ended March 31, 2018									Three Months Ended March 31, 2017
(in millions of U.S. dollars)	Net Realized Gains (Losses)			Net Unrealized Gains (Losses)			Net Impact			Net Realized Gains (Losses)			Net Unrealized Gains (Losses)			Net Impact
Fixed maturities	$	(23	)	$	(1,211	)	$	(1,234	)	$	(12	)	$	256		$	244
Fixed income derivatives	17			—			17			6			—			6
Public equity	10			—			10			4			28			32
Private equity	—			—			—			(8		)	31			23
Mark-to-market on public and private equity	8			—			8			—			—			—
Total investment portfolio(1)	12			(1,211		)	(1,199		)	(10		)	315			305
Variable annuity reinsurance derivative transactions, net of applicable hedges	60			—			60			19			—			19
Other derivatives	2			—			2			2			—			2
Foreign exchange	(77		)	397			320			(19		)	134			115
Other	1			(23		)	(22		)	1			(20		)	(19		)
Net gains (losses) before tax	$	(2	)	$	(837	)	$	(839	)	$	(7	)	$	429		$	422

⁽¹⁾  For the three months ended March 31, 2018, other-than-temporary impairments in Net realized gains (losses) included $1 million for fixed maturities. For the three months ended March 31, 2017, other-than-temporary impairments in Net realized gains (losses) included $6 million for fixed maturities, $5 million for public equity, and $8 million for private equity.

The variable annuity reinsurance derivative transactions resulted in realized gains of $60 million for the three months ended March 31, 2018, reflecting a net decrease in the fair value of GLB liabilities of $38 million, primarily due to rising interest rates, partially offset by lower equity market levels. In addition, we maintain positions in derivative instruments that decrease in fair value when the S&P 500 index increases. There were realized gains of $22 million related to these derivative instruments.

The variable annuity reinsurance derivative transactions resulted in realized gains of $19 million for the three months ended March 31, 2017, reflecting a net decrease in the fair value of GLB liabilities of $93 million, primarily due to higher global equity market levels. In addition, we maintain positions in derivative instruments that decrease in fair value when the S&P 500 index increases. There were realized losses of $74 million related to these derivative instruments.

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Investments

Our investment portfolio is invested primarily in publicly traded, investment grade, fixed income securities with an average credit quality of A/Aa as rated by the independent investment rating services Standard and Poor’s (S&P)/Moody’s Investors Service (Moody’s). The portfolio is externally managed by independent, professional investment managers and is broadly diversified across geographies, sectors, and issuers. Other investments principally comprise direct investments, investment funds, and limited partnerships. We hold no collateralized debt obligations in our investment portfolio, and we provide no credit default protection. We have long-standing global credit limits for our entire portfolio across the organization. Exposures are aggregated, monitored, and actively managed by our Global Credit Committee, comprising senior executives, including our Chief Financial Officer, our Chief Risk Officer, our Chief Investment Officer, and our Treasurer. We also have well-established, strict contractual investment rules requiring managers to maintain highly diversified exposures to individual issuers and closely monitor investment manager compliance with portfolio guidelines.

The average duration of our fixed income securities, including the effect of options and swaps, was 4.3 years and 4.2 years at March 31, 2018 and December 31, 2017, respectively. We estimate that a 100 basis point (bps) increase in interest rates would reduce the valuation of our fixed income portfolio by approximately $4.1 billion at March 31, 2018.

The following table shows the fair value and cost/amortized cost of our invested assets:

	March 31, 2018				December 31, 2017
(in millions of U.S. dollars)	Fair Value		Cost/ Amortized Cost		Fair Value		Cost/ Amortized Cost
Fixed maturities available for sale	$	79,111	$	79,208	$	78,939	$	77,835
Fixed maturities held to maturity	14,122		14,253		14,474		14,335
Short-term investments	2,874		2,874		3,561		3,561
	96,107		96,335		96,974		95,731
Equity securities (1)	948		948		937		737
Other investments (1)	4,919		4,919		4,672		4,417
Total investments	$	101,974	$	102,202	$	102,583	$	100,885

⁽¹⁾  Effective Q1 2018, we adopted new accounting guidance that requires any changes in fair value of equity securities and other investments that are accounted for under the cost-method to be recognized immediately in net income. Therefore, the amortized cost of these investments is equal to their fair value at March 31, 2018.

The fair value of our total investments decreased $609 million during the three months ended March 31, 2018, primarily due to unrealized depreciation, the payment of dividends on our Common Shares, and the repayment of $300 million of senior notes that matured in March 2018. This decrease was partially offset by the investing of net proceeds from the debt issuance, the investing of operating cash flows, and the favorable impact of foreign exchange in the current year.

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The following tables present the market value of our fixed maturities and short-term investments at March 31, 2018 and December 31, 2017. The first table lists investments according to type and second according to S&P credit rating:

	March 31, 2018				December 31, 2017
(in millions of U.S. dollars, except for percentages)	Market Value		% of Total		Market Value		% of Total
Treasury	$	4,277	4	%	$	4,049	4	%
Agency	593		1	%	564		1	%
Corporate and asset-backed securities	26,564		28	%	27,215		28	%
Mortgage-backed securities	18,467		19	%	18,032		19	%
Municipal	19,550		20	%	20,766		21	%
Non-U.S.	23,782		25	%	22,787		23	%
Short-term investments	2,874		3	%	3,561		4	%
Total	$	96,107	100	%	$	96,974	100	%
AAA	$	14,723	15	%	$	15,512	16	%
AA	37,322		39	%	37,407		39	%
A	18,306		19	%	18,369		19	%
BBB	12,616		13	%	12,377		13	%
BB	7,710		8	%	7,941		8	%
B	5,235		6	%	5,135		5	%
Other	195		—	%	233		—
Total	$	96,107	100	%	$	96,974	100	%

Corporate and asset-backed securities

The following table presents our 10 largest global exposures to corporate bonds by market value at March 31, 2018:

(in millions of U.S. dollars)	Market Value
Wells Fargo & Co	$	542
JP Morgan Chase & Co	417
Goldman Sachs Group Inc	410
AT&T Inc	399
Anheuser-Busch InBev NV	354
Bank of America Corp	340
Verizon Communications Inc	338
General Electric Co	334
Morgan Stanley	328
HSBC Holdings Plc	307

Mortgage-backed securities

	S&P Credit Rating										Market  Value		Amortized Cost
March 31, 2018 (in millions of U.S. dollars)	AAA		AA		A		BBB		BB and below		Total		Total
Agency residential mortgage-backed (RMBS)	$	—	$	15,176	$	—	$	—	$	—	$	15,176	$	15,459
Non-agency RMBS	28		27		85		29		24		193		193
Commercial mortgage-backed	2,809		203		86		—		—		3,098		3,145
Total mortgage-backed securities	$	2,837	$	15,406	$	171	$	29	$	24	$	18,467	$	18,797

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Municipal

As part of our overall investment strategy, we may invest in states, municipalities, and other political subdivisions fixed maturity securities (Municipal). We apply the same investment selection process described previously to our Municipal investments. The portfolio is highly diversified primarily in state general obligation bonds and essential service revenue bonds including education and utilities (water, power, and sewers).

Non-U.S.

Our exposure to the Euro results primarily from Chubb European Group Limited which is headquartered in London and offers a broad range of coverages throughout the European Union, Central, and Eastern Europe. Chubb primarily invests in Euro denominated investments to support its local currency insurance obligations and required capital levels. Chubb’s local currency investment portfolios have strict contractual investment guidelines requiring managers to maintain a high quality and diversified portfolio to both sector and individual issuers. Investment portfolios are monitored daily to ensure investment manager compliance with portfolio guidelines.

Our non-U.S. investment grade fixed income portfolios are currency-matched with the insurance liabilities of our non-U.S. operations. The average credit quality of our non-U.S. fixed income securities is A and 54 percent of our holdings are rated AAA or guaranteed by governments or quasi-government agencies. Within the context of these investment portfolios, our government and corporate bond holdings are highly diversified across industries and geographies. Issuer limits are based on credit rating (AA—two percent, A—one percent, BBB—0.5 percent of the total portfolio) and are monitored daily via an internal compliance system. Because of this investment approach, we do not have a direct exposure to troubled sovereign borrowers in Europe. We manage our indirect exposure using the same credit rating based investment approach. Accordingly, we do not believe our indirect exposure is material.

The following table summarizes the market value and amortized cost of our non-U.S. fixed income portfolio by country/sovereign for non-U.S. government securities at March 31, 2018: 

(in millions of U.S. dollars)	Market Value		Amortized Cost
United Kingdom	$	1,392	$	1,381
Republic of Korea	1,071		1,005
Canada	988		1,001
Federative Republic of Brazil	812		794
Province of Ontario	639		644
United Mexican States	579		585
Province of Quebec	510		514
Federal Republic of Germany	494		488
Kingdom of Thailand	488		459
French Republic	343		325
Other Non-U.S. Government Securities (1)	4,542		4,443
Total	$	11,858	$	11,639

⁽¹⁾  There are no investments in Portugal, Ireland, Italy, Greece or Spain.

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The following table summarizes the market value and amortized cost of our non-U.S. fixed income portfolio by country/sovereign for non-U.S. corporate securities at March 31, 2018: 

(in millions of U.S. dollars)	Market Value		Amortized Cost
United Kingdom	$	2,064	$	2,027
Canada	1,454		1,455
United States (1)	998		1,000
France	911		899
Australia	828		818
Netherlands	664		656
Germany	549		536
Japan	424		425
Switzerland	410		407
China	310		310
Other Non-U.S. Corporate Securities	3,312		3,284
Total	$	11,924	$	11,817

⁽¹⁾ The countries that are listed in the non-U.S. corporate fixed income portfolio above represent the ultimate parent company's country of risk. Non-U.S. corporate securities could be issued by foreign subsidiaries of U.S. corporations.

Below-investment grade corporate fixed income portfolio

Below-investment grade securities have different characteristics than investment grade corporate debt securities. Risk of loss from default by the borrower is greater with below-investment grade securities. Below-investment grade securities are generally unsecured and are often subordinated to other creditors of the issuer. Also, issuers of below-investment grade securities usually have higher levels of debt and are more sensitive to adverse economic conditions, such as recession or increasing interest rates, than investment grade issuers. At March 31, 2018, our corporate fixed income investment portfolio included below-investment grade and non-rated securities which, in total, comprised approximately 12 percent of our fixed income portfolio. Our below-investment grade and non-rated portfolio includes over 1,200 issuers, with the greatest single exposure being $144 million.

We manage high-yield bonds as a distinct and separate asset class from investment grade bonds. The allocation to high-yield bonds is explicitly set by internal management and is targeted to securities in the upper tier of credit quality (BB/B). Our minimum rating for initial purchase is BB/B. Ten external investment managers are responsible for high-yield security selection and portfolio construction. Our high-yield managers have a conservative approach to credit selection and very low historical default experience. Holdings are highly diversified across industries and generally subject to a 1.5 percent issuer limit as a percentage of high-yield allocation. We monitor position limits daily through an internal compliance system. Derivative and structured securities (e.g., credit default swaps and collateralized loan obligations) are not permitted in the high-yield portfolio.

Critical Accounting Estimates

As of March 31, 2018, there were no material changes to our critical accounting estimates. For a full discussion of our critical accounting estimates, refer to Item 7 in our 2017 Form 10-K.

Reinsurance recoverable on ceded reinsurance

	March 31		December 31
(in millions of U.S. dollars)	2018		2017
Reinsurance recoverable on unpaid losses and loss expenses (1)	$	13,822	$	14,014
Reinsurance recoverable on paid losses and loss expenses(1)	1,160		1,020
Reinsurance recoverable on losses and loss expenses (1)	$	14,982	$	15,034
Reinsurance recoverable on policy benefits (1)	$	181	$	184

⁽¹⁾  Net of provision for uncollectible reinsurance.

We evaluate the financial condition of our reinsurers and potential reinsurers on a regular basis and also monitor concentrations of credit risk with reinsurers. The provision for uncollectible reinsurance is required principally due to the potential failure of

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reinsurers to indemnify us, primarily because of disputes under reinsurance contracts and insolvencies. The provision for uncollectible reinsurance is based on a default analysis applied to gross reinsurance recoverables, net of approximately $3.7 billion of collateral at both March 31, 2018 and December 31, 2017.

The decrease in reinsurance recoverable on losses and loss expenses was primarily due to collections on catastrophe losses related to the 2017 catastrophic events, partially offset by additional reinsurance recoverable related to catastrophe losses during the first quarter of 2018, and foreign currency movement.

Unpaid losses and loss expenses

As an insurance and reinsurance company, we are required by applicable laws and regulations and GAAP to establish loss and loss expense reserves for the estimated unpaid portion of the ultimate liability for losses and loss expenses under the terms of our policies and agreements with our insured and reinsured customers. With the exception of certain structured settlements, for which the timing and amount of future claim payments are reliably determinable, and certain reserves for unsettled claims that are discounted in statutory filings, our loss reserves are not discounted for the time value of money.

The following table presents a roll-forward of our unpaid losses and loss expenses: 

(in millions of U.S. dollars)	Gross Losses			Reinsurance Recoverable (1)			Net Losses
Balance at December 31, 2017	$	63,179		$	14,014		$	49,165
Losses and loss expenses incurred	5,028			926			4,102
Losses and loss expenses paid	(5,448		)	(1,206		)	(4,242		)
Foreign currency revaluation and other	380			88			292
Balance at March 31, 2018	$	63,139		$	13,822		$	49,317

⁽¹⁾  Net of provision for uncollectible reinsurance of $320 million and $321 million at March 31, 2018 and December 31, 2017, respectively.

The estimate of the liabilities includes provisions for claims that have been reported but are unpaid at the balance sheet date (case reserves) and for obligations on claims that have been incurred but not reported (IBNR) at the balance sheet date. IBNR may also include provisions to account for the possibility that reported claims may settle for amounts that differ from the established case reserves. Loss reserves also include an estimate of expenses associated with processing and settling unpaid claims (loss expenses).

Refer to Note 4 to the Consolidated Financial Statements for a discussion on the changes in the loss reserves.

Asbestos and Environmental (A&E)

There was no significant A&E reserve activity during the three months ended March 31, 2018. A&E reserves are included in Corporate. Refer to our 2017 Form 10-K for further information on our A&E exposures.

Fair value measurements

Accounting guidance defines fair value as the price to sell an asset or transfer a liability (an exit price) in an orderly transaction between market participants and establishes a three-level valuation hierarchy based on the reliability of the inputs. The fair value hierarchy gives the highest priority to quoted prices in active markets (Level 1 inputs) and the lowest priority to unobservable data (Level 3 inputs). Level 2 includes inputs, other than quoted prices within Level 1, that are observable for assets or liabilities either directly or indirectly. Refer to Note 3 to the Consolidated Financial Statements for information on our fair value measurements.

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Catastrophe management

We actively monitor and manage our catastrophe risk accumulation around the world. The table below presents our modeled pre-tax estimates of natural catastrophe probable maximum loss (PML), net of reinsurance, for Worldwide, U.S. hurricane and California earthquake events as of March 31, 2018. For example, according to the model, for the 1-in-100 return period scenario, there is a one percent chance that our losses incurred in any year from U.S. hurricane events could be in excess of $2,853 million (or 5.6 percent of our total shareholders’ equity at March 31, 2018).

	Modeled Net PML
	Worldwide (1)				U.S. Hurricane				California Earthquake
	Annual Aggregate				Annual Aggregate				Single Occurrence
(in millions of U.S. dollars, except for percentages)	Chubb		% of Total Shareholders’ Equity		Chubb		% of Total Shareholders’ Equity		Chubb		% of Total Shareholders’ Equity
1-in-10	$	1,938	3.8	%	$	1,127	2.2	%	$	143	0.3	%
1-in-100	$	4,035	7.9	%	$	2,853	5.6	%	$	1,387	2.7	%
1-in-250	$	6,526	12.7	%	$	5,130	10.0	%	$	1,522	3.0	%

⁽¹⁾ Worldwide losses are comprised of losses arising only from hurricanes, typhoons, convective storms and earthquakes and do not include “non-modeled” perils such as wildfire and flood.

The above modeled loss information at March 31, 2018 reflects our in-force portfolio at January 1, 2018. The March 31, 2018 modeled loss information reflects the April 1, 2018 reinsurance program (see Natural Catastrophe Property Reinsurance Program section) as well as inuring reinsurance protection coverages. Included in the loss estimates for hurricane and earthquake are estimates for losses arising from storm-surge and fire-following perils, respectively.

The above estimates of Chubb’s loss profile are inherently uncertain owing to key assumptions. First, while the use of third-party catastrophe modeling packages to simulate potential hurricane and earthquake losses is prevalent within the insurance industry, the models are reliant upon significant meteorology, seismology, and engineering assumptions to estimate catastrophe losses. In particular, modeled catastrophe events are not always a representation of actual events and ensuing additional loss potential. Second, there is no universal standard in the preparation of insured data for use in the models, the running of the modeling software and interpretation of loss output. These loss estimates do not represent our potential maximum exposures and it is highly likely that our actual incurred losses would vary materially from the modeled estimates.

Natural Catastrophe Property Reinsurance Program

Chubb’s core property catastrophe reinsurance program provides protection against natural catastrophes impacting its primary property operations (i.e., excluding our Global Reinsurance and Life Insurance segments).

We regularly review our reinsurance protection and corresponding property catastrophe exposures. This may or may not lead to the purchase of additional reinsurance prior to a program’s renewal date. In addition, prior to each renewal date, we consider how much, if any, coverage we intend to buy and we may make material changes to the current structure in light of various factors, including modeled PML assessment at various return periods, reinsurance pricing, our risk tolerance and exposures, and various other structuring considerations.

Chubb renewed its Global Property Catastrophe Reinsurance Program for our North American and International operations effective April 1, 2018 through March 31, 2019, with no significant change in coverage from the expiring program. The program consists of three layers in excess of losses retained by Chubb. In addition, Chubb also renewed its terrorism coverage (excluding nuclear, biological, chemical and radiation coverage, with an inclusion of coverage for biological and chemical coverage for personal lines) for the United States from April 1, 2018 through March 31, 2019 with the same limits and retention and percentage placed except that the majority of terrorism coverage is on an aggregate basis above our retentions without a reinstatement.

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Loss Location	Layer of Loss	Comments	Notes
United States (excluding Alaska and Hawaii)	$0 million – $1.0 billion	Losses retained by Chubb	(a)
United States (excluding Alaska and Hawaii)	$1.0 billion – $1.25 billion	All natural perils and terrorism	(b)
United States (excluding Alaska and Hawaii)	$1.25 billion – $2.0 billion	All natural perils and terrorism	(c)
United States (excluding Alaska and Hawaii)	$2.0 billion – $3.5 billion	All natural perils and terrorism	(d)
International (including Alaska and Hawaii)	$0 million – $175 million	Losses retained by Chubb	(a)
International (including Alaska and Hawaii)	$175 million – $925 million	All natural perils and terrorism	(c)
Alaska, Hawaii, and Canada	$925 million – $2.425 billion	All natural perils and terrorism	(d)
(a)  Ultimate retention will depend upon the nature of the loss and the interplay between the underlying per risk programs and certain other catastrophe programs purchased by individual business units. These other catastrophe programs have the potential to reduce our effective retention below the stated levels.
(b) These coverages are 20 percent placed with Reinsurers.
(c)  These coverages are both part of the same Second layer within the Global Catastrophe Program and are 100 percent placed with Reinsurers. As such, it may be exhausted in one region and not available in the other.
(d) These coverages are both part of the same Third layer within the Global Catastrophe Program and are 100 percent placed with Reinsurers. As such, it may be exhausted in one region and not available in the other.

Chubb also has a property catastrophe bond in place (assumed as part of the Chubb Corp acquisition) that offers additional natural catastrophe protection for certain parts of the portfolio. The geographic scope of this coverage is from Virginia through Maine. The East Lane VI 2015 bond currently provides $250 million of coverage as part of a $430 million layer in excess of $2,014 million retention through March 13, 2020.

Crop Insurance

We are, and have been since the 1980s, one of the leading writers of crop insurance in the U.S. and have conducted that business through a managing general agent subsidiary of Rain and Hail. We provide protection throughout the U.S. on a variety of crops and are therefore geographically diversified, which reduces the risk of exposure to a single event or a heavy accumulation of losses in any one region. Our crop insurance business comprises two components – Multiple Peril Crop Insurance (MPCI) and crop-hail insurance.

The MPCI program is offered in conjunction with the U.S. Department of Agriculture (USDA). The policies cover revenue shortfalls or production losses due to natural causes such as drought, excessive moisture, hail, wind, frost, insects, and disease. Generally, policies have deductibles ranging from 10 percent to 50 percent of the insured's risk. The USDA's Risk Management Agency (RMA) sets the policy terms and conditions, rates and forms, and is also responsible for setting compliance standards. As a participating company, we report all details of policies underwritten to the RMA and are party to a Standard Reinsurance Agreement (SRA). The SRA sets out the relationship between private insurance companies and the Federal Crop Insurance Corporation (FCIC) concerning the terms and conditions regarding the risks each will bear including the pro-rata and state stop-loss provisions which allows companies to limit the exposure of any one state or group of states on their underwriting results. In addition to the pro-rata and excess of loss reinsurance protections inherent in the SRA, we also purchase third-party proportional and stop-loss reinsurance for our MPCI business to reduce our exposure. We may also enter into crop derivative contracts to further manage our risk exposure.

Each year the RMA issues a final SRA for the subsequent reinsurance year. In June 2017, the RMA released the 2018 SRA which establishes the terms and conditions for the 2018 reinsurance year (i.e., July 1, 2017 through June 30, 2018) that replaced the 2017 SRA. There were no significant changes in the terms and conditions, and therefore the new SRA does not impact Chubb's outlook on the crop program relative to 2018.

On the MPCI business, we recognize net premiums written as soon as estimable, which is generally when we receive acreage reports from the policyholders on the various crops throughout the U.S. This allows us to best determine the premium

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associated with the liability that is being planted. The MPCI program has specific timeframes as to when producers must report acreage to us and in certain cases, the reporting occurs after the close of the respective reinsurance year. Once the net premium written has been recorded, the premium is then earned over the growing season for the crops. A majority of the crops that are covered in the program are typically subject to the SRA in effect at the beginning of the year. Given the major crops covered in the program, we typically see a substantial written and earned premium impact in the second and third quarters.

The pricing of MPCI premium is determined using a number of factors including commodity prices and related volatility. For instance, in most states the pricing for the MPCI Revenue Product for corn includes a factor that is based on the average price in February of the Chicago Board of Trade December corn futures. To the extent that the corn commodity prices are higher in February than they were in the previous February, and all other factors are the same, the increase in corn prices will increase the corn premium year over year.

Our crop-hail program is a private offering. Premium is earned on the crop-hail program over the coverage period of the policy. Given the very short nature of the growing season, most crop-hail business is typically written in the second and third quarters with the earned premium also more heavily occurring during this time frame. We use industry data to develop our own rates and forms for the coverage offered. The policy primarily protects farmers against yield reduction caused by hail and/or fire, and related costs such as transit to storage. We offer various deductibles to allow the grower to partially self-insure for a reduced premium cost. We limit our crop-hail exposures through the use of township liability limits and third-party proportional and stop-loss reinsurance on our net retained hail business.

Liquidity

We anticipate that positive cash flows from operations (underwriting activities and investment income) should be sufficient to cover cash outflows under most loss scenarios for the near term. In addition to cash from operations, routine sales of investments, and financing arrangements, we have agreements with a third-party bank provider which implemented two international multi-currency notional cash pooling programs to enhance cash management efficiency during periods of short-term timing mismatches between expected inflows and outflows of cash by currency. The programs allow us to optimize investment income by avoiding portfolio disruption. Should the need arise, we generally have access to capital markets and an available $1.0 billion letter of credit/revolver facility. At March 31, 2018, our LOC usage was $305 million. Our access to funds under an existing credit facility is dependent on the ability of the banks that are a party to the facility to meet their funding commitments. Our existing credit facility has a remaining term expiring in October 2022 and requires that we maintain certain financial covenants, all of which we met at March 31, 2018. Should our existing credit provider experience financial difficulty, we may be required to replace credit sources, possibly in a difficult market. If we cannot obtain adequate capital or sources of credit on favorable terms, on a timely basis, or at all, our business, operating results, and financial condition could be adversely affected. To date, we have not experienced difficulty accessing our credit facility. Refer to "Credit Facilities" in our 2017 10-K for additional information.

The payment of dividends or other statutorily permissible distributions from our operating companies are subject to the laws and regulations applicable to each jurisdiction, as well as the need to maintain capital levels adequate to support the insurance and reinsurance operations, including financial strength ratings issued by independent rating agencies. During the three months ended March 31, 2018, we were able to meet all of our obligations, including the payments of dividends on our Common Shares, with our net cash flows.

We assess which subsidiaries to draw dividends from based on a number of factors. Considerations such as regulatory and legal restrictions as well as the subsidiary’s financial condition are paramount to the dividend decision. Chubb Limited received dividends of nil and $450 million from its Bermuda subsidiaries during the three months ended March 31, 2018 and 2017, respectively.

The payment of any dividends from CGM or its subsidiaries is subject to applicable U.K. insurance laws and regulations. In addition, the release of funds by Syndicate 2488 to subsidiaries of CGM is subject to regulations promulgated by the Society of Lloyd’s. The U.S. insurance subsidiaries of Chubb INA Holdings Inc. (Chubb INA) may pay dividends, without prior regulatory approval, subject to restrictions set out in state law of the subsidiary’s domicile (or, if applicable, commercial domicile). Chubb INA’s international subsidiaries are also subject to insurance laws and regulations particular to the countries in which the subsidiaries operate. These laws and regulations sometimes include restrictions that limit the amount of dividends payable without prior approval of regulatory insurance authorities. Chubb Limited received no dividends from CGM or Chubb INA during the three months ended March 31, 2018 and 2017. Debt issued by Chubb INA is serviced by statutorily permissible distributions by Chubb INA’s insurance subsidiaries to Chubb INA as well as other group resources. Chubb INA received

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dividends of $3.0 billion and $46 million from its subsidiaries during the three months ended March 31, 2018 and 2017, respectively.

Cash Flows

Our sources of liquidity include cash from operations, routine sales of investments, and financing arrangements. The following is a discussion of our cash flows for the three months ended March 31, 2018 and 2017.

Operating cash flows were $551 million in the three months ended March 31, 2018, compared to $1.0 billion in the prior year period. The decrease in operating cash flow was due to higher net claims paid in the current year, principally reflecting the catastrophe loss payments related to the 2017 catastrophe events.

Cash used for investing was $881 million in the three months endedMarch 31, 2018, compared to $66 million in the prior year period. Cash from financing was $1.6 billion in the three months endedMarch 31, 2018, compared to cash used for financing of $858 million in the prior year period. The current year included $1.9 billion of net proceeds from the issuance of long-term debt (net of repayments) partially offset by $330 million of dividends paid on Common Shares.

Both internal and external forces influence our financial condition, results of operations, and cash flows. Claim settlements, premium levels, and investment returns may be impacted by changing rates of inflation and other economic conditions. In many cases, significant periods of time, ranging up to several years or more, may lapse between the occurrence of an insured loss, the reporting of the loss to us, and the settlement of the liability for that loss.

In the current low interest rate environment, we use repurchase agreements as a low-cost funding alternative. At March 31, 2018, there were $1.4 billion in repurchase agreements outstanding with various maturities over the next 7 months.

Capital Resources

Capital resources consist of funds deployed or available to be deployed to support our business operations.

	March 31			December 31
(in millions of U.S. dollars, except for ratios)	2018			2017
Short-term debt	$	1,669		$	1,013
Long-term debt	12,786			11,556
Total financial debt	14,455			12,569
Trust preferred securities	308			308
Total shareholders’ equity	51,287			51,172
Total capitalization	$	66,050		$	64,049
Ratio of financial debt to total capitalization	21.9		%	19.6		%
Ratio of financial debt plus trust preferred securities to total capitalization	22.4		%	20.1		%

Repurchase agreements are excluded from the table above and are disclosed separately from short-term debt in the Consolidated balance sheets. The repurchase agreements are collateralized borrowings where we maintain the right and ability to redeem the collateral on short notice, unlike short-term debt which comprises the current maturities of our long-term debt instruments.

Chubb INA Holdings Inc.’s (Chubb INA) $300 million of 5.8 percent senior notes due March 2018 were paid upon maturity. In addition, Chubb INA issued €900 million of 1.55 percent Euro denominated senior notes due March 2028 and €900 million of 2.5 percent Euro denominated senior notes due March 2038 (totaling $2.2 billion based on the foreign exchange rate at the date of issuance).

On April 6, 2018, Chubb INA redeemed $1.0 billion of 6.375 percent unsecured junior subordinated capital securities. Refer to Note 5 to the Consolidated Financial Statements for additional details about the debt issued and debt redeemed.

In December 2017, our Board of Directors (Board) authorized the repurchase of up to $1.0 billion of Chubb's Common Shares from January 1, 2018 through December 31, 2018. There were no shares repurchases for the three months ended March 31,

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2018. At March 31, 2018, there were 13,952,378 Common Shares in treasury with a weighted average cost of $123.80 per share.

We generally maintain the ability to issue certain classes of debt and equity securities via an unlimited Securities and Exchange Commission (SEC) shelf registration which is renewed every three years. This allows us capital market access for refinancing as well as for unforeseen or opportunistic capital needs. Our current shelf registration on file with the SEC expires in October 2018.

Dividends

We have paid dividends each quarter since we became a public company in 1993. Under Swiss law, dividends must be stated in Swiss francs though dividend payments are made by Chubb in U.S. dollars. Refer to Note 7 to the Consolidated Financial Statements for a discussion of our dividend methodology.

At our May 2017 annual general meeting, our shareholders approved an annual dividend for the following year of up to $2.84 per share, or CHF 2.78 per share, calculated using the USD/CHF exchange rate as published in the Wall Street Journal on May 18, 2017, which was paid in four quarterly installments of $0.71 per share after the general meeting by way of a distribution from capital contribution reserves, transferred to free reserves for payment. The Board will determine the record and payment dates at which the annual dividend may be paid until the date of the 2018 annual general meeting, and is authorized to abstain from distributing a dividend at their discretion. The annual dividend approved in May 2017 represented an $0.08 per share increase ($0.02 per quarter) over the prior year dividend.

The following table represents dividends paid per Common Share to shareholders of record on each of the following dates:

Shareholders of record as of:	Dividends paid as of:
December 29, 2017	January 19, 2018	$0.71 (CHF 0.70)
March 29, 2018	April 20, 2018	$0.71 (CHF 0.66)

ITEM 3. Quantitative and Qualitative Disclosures about Market Risk

Refer to Item 7A included in our 2017 Form 10-K.

Foreign currency management

As a global company, Chubb entities transact business in multiple currencies. Our policy is to generally match assets, liabilities and required capital for each individual jurisdiction in local currency, which would include the use of derivatives. We do not hedge our net asset non-U.S. dollar capital positions; however, we do consider hedging for planned cross border transactions. For an estimated impact of foreign currency movement on our net assets denominated in non-U.S. currencies, refer to Item 7A in our 2017 Form 10-K.  This information will be updated and disclosed in interim filings if our net assets in non-U.S. currencies change materially from the December 31, 2017 balances disclosed in the 2017 Form 10-K.

Reinsurance of GMDB and GLB guarantees

Chubb views its variable annuity reinsurance business as having a similar risk profile to that of catastrophe reinsurance with the probability of long-term economic loss relatively small, at the time of pricing. Adverse changes in market factors and policyholder behavior will have an impact on both Life insurance underwriting income and net income. When evaluating these risks, we expect to be compensated for taking both the risk of a cumulative long-term economic net loss, as well as the short-term accounting variations caused by these market movements. Therefore, we evaluate this business in terms of its long-term economic risk and reward.

Net income is directly impacted by changes in benefit reserves calculated in connection with reinsurance of variable annuity guarantees, primarily GMDB and GLB. In addition, net income is directly impacted by changes in the fair value of the GLB liability (FVL), which is classified as a derivative for accounting purposes. The FVL established for a GLB reinsurance contract represents the difference between the fair value of the contract and the benefit reserves. Benefit reserves and FVL calculations are directly affected by market factors, including equity levels, interest rate levels, credit risk, and implied volatilities, as well as policyholder behaviors, such as annuitization and lapse rates.

The tables below are estimates of the sensitivities to instantaneous changes in economic inputs (e.g., equity shock, interest rate shock etc.) or actuarial assumptions at March 31, 2018 of the FVL and of the fair value of specific derivative instruments held

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(hedge value) to partially offset the risk in the variable annuity guarantee reinsurance portfolio. The following assumptions should be considered when using the below tables:

• No changes to the benefit ratio used to establish benefit reserves at March 31, 2018.

• Equity shocks impact all global equity markets equally

• Our liabilities are sensitive to global equity markets in the following proportions: 75 percent—85 percent U.S. equity, 15 percent—25 percent international equity.

• Our current hedge portfolio is sensitive to global equity markets in the following proportions: 100 percent U.S. equity.

• We would suggest using the S&P 500 index as a proxy for U.S. equity, and the MSCI EAFE index as a proxy for international equity.

• Interest rate shocks assume a parallel shift in the U.S. yield curve

• Our liabilities are also sensitive to global interest rates at various points on the yield curve, mainly the U.S. Treasury curve in the following proportions: up to 10 percent short-term rates (maturing in less than 5 years), 20 percent—30 percent medium-term rates (maturing between 5 years and 10 years, inclusive), and 60 percent—70 percent long-term rates (maturing beyond 10 years).

• A change in AA-rated credit spreads (AA-rated credit spreads are a proxy for both our own credit spreads and the credit spreads of the ceding insurers) impacts the rate used to discount cash flows in the fair value model.

• The hedge sensitivity is from March 31, 2018 market levels.

• The sensitivities are not directly additive because changes in one factor will affect the sensitivity to changes in other factors. The sensitivities do not scale linearly and may be proportionally greater for larger movements in the market factors. The sensitivities may also vary due to foreign exchange rate fluctuations. The calculation of the FVL is based on internal models that include assumptions regarding future policyholder behavior, including lapse, annuitization, and asset allocation. These assumptions impact both the absolute level of the FVL as well as the sensitivities to changes in market factors shown below. Actual sensitivity of our net income may differ from those disclosed in the tables below due to differences between short-term market movements and management judgment regarding the long-term assumptions implicit in our benefit ratios. Furthermore, the sensitivities below could vary by multiples of the sensitivities in the tables below.

• In addition, the tables below do not reflect the expected quarterly run rate of net income generated by the variable annuity guarantee reinsurance portfolio if markets remain unchanged during the period. All else equal, if markets remain unchanged during the period, the Gross FVL will increase, resulting in a realized loss. The realized loss occurs primarily because, during the period, we will collect premium on the full population while 85 percent of that population has become eligible to annuitize and generate a claim (since approximately 15 percent of policies are not eligible to annuitize until after March 31, 2018). This increases the Gross FVL because future premiums are lower by the amount collected in the quarter, and also because future claims are discounted for a shorter period. We refer to this increase in Gross FVL as “timing effect”. The unfavorable impact of timing effect on our Gross FVL in a quarter is not reflected in the sensitivity tables below. For this reason, when using the tables below to estimate the sensitivity of Gross FVL in the second quarter to various changes, it is necessary to assume an additional $5 million to $45 million increase in Gross FVL and realized losses. However, the impact to Net income is substantially mitigated because the majority of this realized loss is offset by the positive quarterly run rate of Life insurance underwriting income generated by the variable annuity guarantee reinsurance portfolio if markets remain unchanged during the period. Note that both the timing effect and the quarterly run rate of Life insurance underwriting income change over time as the book ages.

75

Interest Rate Shock		Worldwide Equity Shock
(in millions of U.S. dollars)		+10%			Flat			-10%			-20%			-30%			-40%
+100 bps	(Increase)/decrease in Gross FVL	$	216		$	141		$	24		$	(150	)	$	(357	)	$	(598	)
	Increase/(decrease) in hedge value	(155		)	—			155			311			466			622
	Increase/(decrease) in net income	$	61		$	141		$	179		$	161		$	109		$	24
Flat	(Increase)/decrease in Gross FVL	$	116		$	—		$	(169	)	$	(370	)	$	(606	)	$	(873	)
	Increase/(decrease) in hedge value	(155		)	—			155			311			466			622
	Increase/(decrease) in net income	$	(39	)	$	—		$	(14	)	$	(59	)	$	(140	)	$	(251	)
-100 bps	(Increase)/decrease in Gross FVL	$	(51	)	$	(216	)	$	(410	)	$	(639	)	$	(900	)	$	(1,186	)
	Increase/(decrease) in hedge value	(155		)	—			155			311			466			622
	Increase/(decrease) in net income	$	(206	)	$	(216	)	$	(255	)	$	(328	)	$	(434	)	$	(564	)
Sensitivities to Other Economic Variables		AA-rated Credit Spreads						Interest Rate Volatility						Equity Volatility
(in millions of U.S. dollars)		+100 bps			-100 bps			+2%			-2%			+2%			-2%
(Increase)/decrease in Gross FVL		$	53		$	(59	)	$	—		$	—		$	(9	)	$	9
Increase/(decrease) in hedge value		—			—			—			—			—			—
Increase/(decrease) in net income		$	53		$	(59	)	$	—		$	—		$	(9	)	$	9
Sensitivities to Actuarial Assumptions								Mortality
(in millions of U.S. dollars)								+20%			+10%			-10%			-20%
(Increase)/decrease in Gross FVL								$	18		$	9		$	(9	)	$	(19	)
Increase/(decrease) in hedge value								—			—			—			—
Increase/(decrease) in net income								$	18		$	9		$	(9	)	$	(19	)
								Lapses
(in millions of U.S. dollars)								+50%			+25%			-25%			-50%
(Increase)/decrease in Gross FVL								$	70		$	40		$	(45	)	$	(96	)
Increase/(decrease) in hedge value								—			—			—			—
Increase/(decrease) in net income								$	70		$	40		$	(45	)	$	(96	)
								Annuitization
(in millions of U.S. dollars)								+50%			+25%			-25%			-50%
(Increase)/decrease in Gross FVL								$	(375	)	$	(199	)	$	167		$	331
Increase/(decrease) in hedge value								—			—			—			—
Increase/(decrease) in net income								$	(375	)	$	(199	)	$	167		$	331

76

ITEM 4. Controls and Procedures

Chubb’s management, with the participation of Chubb’s Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of Chubb’s disclosure controls and procedures as defined in Rule 13a-15(e) and Rule 15d-15(e) under the Securities Exchange Act of 1934 as of March 31, 2018. Based upon that evaluation, Chubb’s Chief Executive Officer and Chief Financial Officer concluded that Chubb’s disclosure controls and procedures are effective in allowing information required to be disclosed in reports filed under the Securities and Exchange Act of 1934 to be recorded, processed, summarized, and reported within time periods specified in the rules and forms of the SEC, and that such information is accumulated and communicated to Chubb’s management, including its Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

In 2016, Chubb completed the acquisition of The Chubb Corporation. During the three months ended March 31, 2018, we continued to integrate the information technology environments of the two companies.

There were no other changes to Chubb's internal controls over financial reporting during the three months ended March 31, 2018 that have materially affected, or are reasonably likely to materially affect, Chubb's internal controls over financial reporting.

PART II OTHER INFORMATION

ITEM 1. Legal Proceedings

The information required with respect to this item is included in Note 6 g) to the Consolidated Financial Statements which is hereby incorporated by reference.

ITEM 1A. Risk Factors

Refer to "Risk Factors" under Item 1A of Part I of our 2017 Form 10-K. There have been no material changes to the risk factors disclosed in Item 1A of Part I of our 2017 Form 10-K.

ITEM 2. Unregistered Sales of Equity Securities and Use of Proceeds and Issuer Repurchases of Equity Securities

Issuer’s Repurchases of Equity Securities

The following table provides information with respect to purchases by Chubb of its Common Shares during the three months ended March 31, 2018:

Period	Total Number of Shares Purchased (1)	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plan	Approximate Dollar Value of Shares that May Yet be Purchased Under the Plan (2)
January 1 through January 31	13,936	$	142.88	—	$	1.0	billion
February 1 through February 28	466,953	$	144.88	—	$	1.0	billion
March 1 through March 31	169,990	$	146.61	—	$	1.0	billion
Total	650,879	$	145.29	—

⁽¹⁾  This column includes activity related to the surrender to Chubb of Common Shares to satisfy tax withholding obligations in connection with the vesting of restricted stock issued to employees and the exercising of options by employees.

⁽²⁾ Refer to Note 7 to the Consolidated Financial Statements for more information on the Chubb Limited securities repurchase authorization. In December 2017, our Board authorized the repurchase of up to $1.0 billion of Chubb's Common Shares from January 1, 2018 through December 31, 2018.

77

ITEM 5. Other Information

Disclosure of Certain Activities Under Section 13(r) of the Securities Exchange Act of 1934

Section 13(r) of the Securities Exchange Act of 1934, as amended, requires an issuer to disclose in its annual or quarterly reports whether it or an affiliate knowingly engaged in certain activities described in that section, including certain activities related to Iran during the period covered by the report.

Chubb, through certain of its non-U.S. subsidiaries, provides insurance and reinsurance coverage relating to marine risks for policyholders with global operations. As a result of the modification of U.S. and European sanctions on Iran in 2016, several marine policyholders have informed us that they are shipping cargo to and from Iran, including transporting crude oil, petrochemicals and refined petroleum products. As the activities of our insureds and reinsureds are permitted under applicable laws and regulations, including U. S. Department of Treasury General License H, Chubb intends for its non-U.S. subsidiaries to continue providing such coverage to its insureds and reinsureds to the extent permitted by applicable law. Since these policies insure multiple voyages and fleets containing multiple ships, we are unable to attribute gross revenues and net profits from such marine policies to these activities involving Iran.

ITEM 6. Exhibits

		Incorporated by Reference
Exhibit Number	Exhibit Description	Form	Original Number	Date Filed	Filed Herewith
3.1	Articles of Association of the Company, as amended	8-K	3.1	May 20, 2016
3.2	Organizational Regulations of the Company, as amended	8-K	3.1	November 21, 2016
4.1	Articles of Association of the Company, as amended	8-K	4.1	May 20, 2016
4.2	Organizational Regulations of the Company, as amended	8-K	3.1	November 21, 2016
4.3	Form of Officer's Certificate related to the 1.550% Senior Notes due 2028 and 2.500% Senior Notes due 2038	8-K	4.1	March 6, 2018
4.4	Form of Global Note for the 1.550% Senior Notes due 2028	8-K	4.2	March 6, 2018
4.5	Form of Global Note for the 2.500% Senior Notes due 2038	8-K	4.3	March 6, 2018
10.1*	Form of Incentive Stock Option Terms under the Chubb Limited 2016 Long-Term Incentive Plan for Executive Officers	10-K	10.89	February 23, 2018
10.2*	Form of Restricted Stock Award Terms under the Chubb Limited 2016 Long-Term Incentive Plan for Executive Officers	10-K	10.90	February 23, 2018
10.3*	Form of Performance Based Restricted Stock Award Terms under the Chubb Limited 2016 Long-Term Incentive Plan for Executive Officers	10-K	10.91	February 23, 2018
10.4*	Form of Non-Qualified Stock Option Terms under the Chubb Limited 2016 Long-Term Incentive Plan for Executive Officers	10-K	10.92	February 23, 2018
10.5*	Form of Restricted Stock Unit Award Terms under the Chubb Limited 2016 Long-Term Plan for Executive Officers	10-K	10.93	February 23, 2018

78

10.6*	Form of Incentive Stock Option Terms under the Chubb Limited 2016 Long-Term Incentive Plan for Swiss Executive Management	10-K	10.94	February 23, 2018
10.7*	Form of Non-Qualified Stock Option Terms under the Chubb Limited 2016 Long-Term Incentive Plan for Swiss Executive Management	10-K	10.95	February 23, 2018
10.8*	Form of Restricted Stock Award Terms under the Chubb Limited 2016 Long-Term Incentive Plan for Swiss Executive Management	10-K	10.96	February 23, 2018
10.9*	Form of Restricted Stock Unit Award Terms under the Chubb Limited 2016 Long-Term Incentive plan for Swiss Executive Management	10-K	10.97	February 23, 2018
10.10*	Form of Performance Based Restricted Stock Award Terms under the Chubb Limited 2016 Long-Term Incentive Plan for Swiss Executive Management	10-K	10.98	February 23, 2018
10.11*	Chubb Limited Clawback Policy	10-K	10.99	February 23, 2018
31.1	Certification Pursuant to Section 302 of The Sarbanes-Oxley Act of 2002				X
31.2	Certification Pursuant to Section 302 of The Sarbanes-Oxley Act of 2002				X
32.1	Certification Pursuant to 18 U.S.C. Section 1350, As Adopted Pursuant to Section 906 of The Sarbanes-Oxley Act of 2002				X
32.2	Certification Pursuant to 18 U.S.C. Section 1350, As Adopted Pursuant to Section 906 of The Sarbanes-Oxley Act of 2002				X
101.1	The following financial information from Chubb Limited’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2018 formatted in XBRL: (i) Consolidated Balance Sheets at March 31, 2018, and December 31, 2017; (ii) Consolidated Statements of Operations and Comprehensive Income for the three months ended March 31, 2018 and 2017; (iii) Consolidated Statements of Shareholders’ Equity for the three months ended March 31, 2018 and 2017; (iv) Consolidated Statements of Cash Flows for the three months ended March 31, 2018 and 2017; and (v) Notes to Consolidated Financial Statements				X

* Management contract, compensatory plan or arrangement

79

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	CHUBB LIMITED
	(Registrant)
May 2, 2018	/s/ Evan G. Greenberg
	Evan G. Greenberg
	Chairman, President and Chief Executive Officer
May 2, 2018	/s/ Philip V. Bancroft
	Philip V. Bancroft
	Executive Vice President and Chief Financial Officer

80

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO

SECTION 302 OF

THE SARBANES-OXLEY ACT OF 2002

I, Evan G. Greenberg, certify that:

1) I have reviewed this quarterly report on Form 10-Q of Chubb Limited;

2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4) The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5) The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s Board of Directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 2, 2018

/s/ Evan G. Greenberg

Evan G. Greenberg

Chairman, President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO

SECTION 302 OF

THE SARBANES-OXLEY ACT OF 2002

I, Philip V. Bancroft, certify that:

1) I have reviewed this quarterly report on Form 10-Q of Chubb Limited;

2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4) The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5) The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s Board of Directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 2, 2018

/s/ Philip V. Bancroft

Philip V. Bancroft

Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned officer of Chubb Limited (the Corporation) hereby certifies that the Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2018, fully complies with the applicable reporting requirements of Section 13(a) of the Securities Exchange Act of 1934 (15 U.S.C. 78m(a)) and that the information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Corporation.

Dated: May 2, 2018	/s/ Evan G. Greenberg
	Evan G. Greenberg
	Chairman, President and Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned officer of Chubb Limited (the Corporation) hereby certifies that the Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2018, fully complies with the applicable reporting requirements of Section 13(a) of the Securities Exchange Act of 1934 (15 U.S.C. 78m(a)) and that the information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Corporation.

Dated: May 2, 2018	/s/ Philip V. Bancroft
	Philip V. Bancroft
	Executive Vice President and Chief Financial Officer

XML

Document and Entity Information - SFr / shares	3 Months Ended
	Mar. 31, 2018	Apr. 19, 2018	Dec. 31, 2017
Entity Information [Line Items]
Common Shares, par value	SFr 24.15		SFr 24.15
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	CB
Entity Registrant Name	Chubb Ltd
Entity Central Index Key	0000896159
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Common Shares Outstanding		465,802,115

XML

Consolidated Balance Sheets - USD ($) $ in Millions		Mar. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Assets
Fixed maturities available for sale, at fair value (amortized cost – $XX,XXX and $77,835)(includes hybrid financial instruments of $X and $5)		$ 79,111		$ 78,939
Fixed maturities held to maturity, at amortized cost (fair value – $14,122 and $14,474)		14,253		14,335
Equity securities, at fair value (cost – $948 and $737)		948		937
Short-term investments, at fair value and amortized cost		2,874		3,561
Other investments (cost – $4,919 and $4,417)		4,919		4,672
Total investments		102,105		102,444
Cash		1,988	[1]	728	[2]
Restricted Cash	[1]	125		123
Securities lending collateral		2,039		1,737
Accrued investment income		895		909
Insurance and reinsurance balances receivable		9,570		9,334
Reinsurance Recoverable Losses And Loss Expenses		14,982		15,034
Reinsurance recoverable on policy benefits		181		184
Deferred policy acquisition costs		4,843		4,723
Value of business acquired		321		326
Goodwill		15,686		15,541
Other intangible assets		6,437		6,513
Prepaid reinsurance premiums		2,600		2,529
Investments in partially-owned insurance companies		664		662
Other assets		6,345		6,235
Total assets		168,781		167,022
Liabilities
Unpaid losses and loss expenses		63,139		63,179		$ 60,540
Unearned premiums		15,495		15,216
Future policy benefits		5,412		5,321
Insurance and reinsurance balances payable		6,148		5,868
Securities lending payable		2,039		1,737
Accounts payable, accrued expenses, and other liabilities		8,618		9,545
Deferred tax liabilities		468		699
Repurchase agreements		1,412		1,408
Short-term debt		1,669		1,013
Long-term debt		12,786		11,556
Trust preferred securities		308		308
Total liabilities		117,494		115,850
Commitments and contingencies
Shareholders’ equity
Common Shares (CHF 24.15 par value; 479,783,864 shares issued; 465,831,486 and 463,833,179 shares outstanding)		11,121		11,121
Common Shares in treasury (13,952,378 and 15,950,685 shares)		(1,727)		(1,944)
Additional Paid in Capital, Common Stock		13,430		13,978
Retained earnings		28,965		27,474
Accumulated other comprehensive income (loss) (AOCI)		(502)		543
Total shareholders’ equity		51,287		51,172
Total liabilities and shareholders’ equity		$ 168,781		$ 167,022

[1] Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2018, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[2] Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2017, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

XML

Consolidated Balance Sheets (Parenthetical) $ in Millions	Mar. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares
Statement of Financial Position [Abstract]
Available for sale, at amortized cost	$ 79,208	$ 77,835
Fixed maturities available for sale, hybrid financial instruments	7	5
Held to maturity, at Fair Value	14,122	14,474
Equity securities, at cost	948	737
Other investments, cost	$ 4,919	$ 4,417
Common Shares, shares issued | shares	479,783,864	479,783,864
Common Shares, shares outstanding | shares	465,831,486	463,833,179
Common Shares in treasury, shares | shares	13,952,378	15,950,685

XML

Consolidated Statements Of Operations and Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues
Net premiums written	$ 7,104	$ 6,710
Change In Unearned Premium Net	77	(62)
Net premiums earned	7,027	6,772
Net investment income	806	745
Net Realized Gains Losses [Abstract]
Other-than-temporary impairment (OTTI) losses gross	(1)	(19)
Portion of OTTI losses recognized in other comprehensive income (OCI)	0	0
Net OTTI losses recognized in income	(1)	(19)
Net realized gains (losses) excluding OTTI losses	(1)	12
Total net realized gains (losses) (includes $(23) and $(8) reclassified from AOCI)	(2)	(7)
Total revenues	7,831	7,510
Expenses
Losses and loss expenses	4,102	3,789
Policy benefits	151	168
Policy acquisition costs	1,464	1,397
Administrative expenses	692	676
Interest expense	157	154
Other (income) expense	(47)	(70)
Amortization of purchased intangibles	85	64
Chubb integration expenses	10	111
Total expenses	6,614	6,289
Income before income tax	1,217	1,221
Income tax expense (benefit) (includes $(3) and $(6) on reclassified unrealized losses)	135	128
Net income	1,082	1,093
Other comprehensive income (loss)
Unrealized appreciation (depreciation)	(1,234)	307
Reclassification adjustment for net realized losses included in net income	23	8
Unrealized appreciation (Depreciation) after reclassification adjustment	(1,211)	315
Change in:
Cumulative foreign currency translation adjustment	397	134
Postretirement benefit liability adjustment	(23)	(20)
Other comprehensive income (loss), before income tax	(837)	429
Income tax (expense) benefit related to OCI items	208	(115)
Other comprehensive income (loss)	(629)	314
Comprehensive income	$ 453	$ 1,407
Earnings per share
Basic earnings per share	$ 2.32	$ 2.33
Diluted earnings per share	$ 2.30	$ 2.31

XML

Consolidated Statements Of Operations and Comprehensive Income Consolidated Statements of Operations and Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Total net realized gains (losses) reclassified from AOCI	$ (23)	$ (8)
Income tax expense on reclassified unrealized gains and loses	$ (3)	$ (6)

XML

Consolidated Statements Of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Common shares in treasury [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]	Cumulative Foreign Currency Translation Adjustment [Member]	Postretirement Benefit Liability Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance					$ 23,613	$ 1,058
Balance - beginning of period at Dec. 31, 2016		$ 11,121	$ (1,480)	$ 15,335	23,613	1,058	$ (1,663)	$ 291
Common Shares repurchased			(140)
Net shares redeemed under employee share-based compensation plans			222	(260)
Exercise of stock options				(21)
Share-based compensation expense				65
Net income	$ 1,093				1,093
Funding of dividends declared to Retained earnings				(324)
Funding of dividends declared from Additional paid-in capital					324
Dividends declared on Common Shares					(324)
Change in period, before reclassification from AOCI, net of income tax benefit (expense) of $226 and $(102)						205
Amounts reclassified from AOCI, net of income tax expense of $(3) and $(6)						2
Change in period, net of income tax benefit (expense) of $223 and $(108)						207
Change in period, net of income tax expense of $(19) and $(3)							131
Change in period, net of income tax benefit (expense) of $4 and $(4)								(24)
Balance - end of period at Mar. 31, 2017	49,224	11,121	(1,398)	14,795	24,706	1,265	(1,532)	267	$ 0
Balance - beginning of period at Dec. 31, 2017	51,172	11,121	(1,944)	13,978	27,474	1,450	(1,187)	280
Common Shares repurchased			0
Net shares redeemed under employee share-based compensation plans			217	(262)
Exercise of stock options				(16)
Share-based compensation expense				62
Net income	1,082				1,082
Funding of dividends declared to Retained earnings				(332)
Funding of dividends declared from Additional paid-in capital					332
Dividends declared on Common Shares					(332)
Change in period, before reclassification from AOCI, net of income tax benefit (expense) of $226 and $(102)						(1,008)
Amounts reclassified from AOCI, net of income tax expense of $(3) and $(6)						20
Change in period, net of income tax benefit (expense) of $223 and $(108)						(988)
Change in period, net of income tax expense of $(19) and $(3)							378
Change in period, net of income tax benefit (expense) of $4 and $(4)								(19)
Balance - end of period at Mar. 31, 2018	$ 51,287	$ 11,121	$ (1,727)	$ 13,430	$ 28,965	$ 46	$ (809)	$ 261	$ (502)

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Consolidated Statements Of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement Consolidated Statements Of Shareholders Equity [Abstract]
Change in year, before reclassification from AOCI, net of income tax benefit(expense)	$ 226	$ (102)
Income tax benefit (expense) from reclassification of unrealized gains	(3)	(6)
Net unrealized appreciation on investments, Change in period, income tax (expense) benefit	223	(108)
Cumulative translation adjustment, Change in period, income tax(expense) benefit	(19)	(3)
Net income	1,082	1,093
Pension liability adjustment, Change in period, income tax (expense) benefit	$ 4	$ (4)

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Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net income	$ 1,082	$ 1,093
Adjustments to reconcile net income to net cash flows from operating activities
Net realized (gains) losses	2	7
Amortization of premiums/discounts on fixed maturities	155	184
Amortization of UPR related to the Chubb Corp acquisition and other intangibles	85	64
Deferred income taxes	(2)	(127)
Unpaid losses and loss expenses	(420)	(154)
Unearned premiums	111	17
Future policy benefits	58	40
Insurance and reinsurance balances payable	250	252
Accounts payable, accrued expenses, and other liabilities	(724)	(491)
Income taxes payable	88	191
Insurance and reinsurance balances receivable	(174)	30
Reinsurance recoverable on losses and loss expenses	138	(122)
Reinsurance recoverable on policy benefits	3	(5)
Deferred policy acquisition costs	(75)	(59)
Prepaid reinsurance premiums	(42)	(81)
Other	16	174
Net cash flows from operating activities	551	1,013
Cash flows from investing activities
Purchases of fixed maturities available for sale	(5,972)	(6,250)
Purchases of fixed maturities held to maturity	(162)	(157)
Purchases of equity securities	(55)	(37)
Sales of fixed maturities available for sale	2,562	3,395
Sales of equity securities	40	46
Maturities and redemptions of fixed maturities available for sale	1,865	2,543
Maturities and redemptions of fixed maturities held to maturity	255	240
Net change in short-term investments	731	232
Net derivative instruments settlements	39	(89)
Private equity contribution	(353)	(198)
Private equity distribution	201	315
Other	(32)	(106)
Net cash flows used for investing activities	(881)	(66)
Cash flows from financing activities
Dividends paid on Common Shares	(330)	(324)
Common Shares repurchased	(29)	(128)
Proceeds from issuance of long-term debt	(300)	(500)
Proceeds from issuance of repurchase agreements	408	753
Proceeds from Issuance of Long-term Debt	2,175	0
Repayment of repurchase agreements	(404)	(752)
Proceeds from share-based compensation plans	34	42
Policyholder contract deposits	118	109
Policyholder contract withdrawals	(105)	(58)
Net cash flows from (used for) financing activities	1,567	(858)
Effect of foreign currency rate changes on cash and restricted cash	25	(17)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	1,262	72
Cash and Restricted Cash - Beginning of year	851	1,088
Cash and Restricted Cash - end of Year	2,113	1,160
Supplemental cash flow information
Taxes paid	93	54
Interest paid	$ 82	$ 75

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General

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

General

General

a) Basis of presentation

Chubb Limited is a holding company incorporated in Zurich, Switzerland. Chubb Limited, through its subsidiaries, provides a broad range of insurance and reinsurance products to insureds worldwide. Chubb operates through the following business segments: North America Commercial P&C Insurance, North America Personal P&C Insurance, North America Agricultural Insurance, Overseas General Insurance, Global Reinsurance, and Life Insurance. Refer to Note 10 for additional information.

The interim unaudited consolidated financial statements, which include the accounts of Chubb Limited and its subsidiaries (collectively, Chubb, we, us, or our), have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) and, in the opinion of management, reflect all adjustments (consisting of normally recurring accruals) necessary for a fair statement of the results and financial position for such periods. All significant intercompany accounts and transactions, including internal reinsurance transactions, have been eliminated.

The results of operations and cash flows for any interim period are not necessarily indicative of the results for the full year. These consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in our 2017 Form 10-K.

b) Restricted cash

Effective January 1, 2018, we retrospectively adopted guidance on "Restricted Cash" that clarified the presentation of restricted cash on the consolidated statement of cash flows. As a result, we revised the statement of cash flows for the three months ended March 31, 2017 to include restricted cash in the beginning and ending cash balances. In addition, we reclassified $123 million of Restricted cash from Other assets to a separate line in the balance sheet as of December 31, 2017.

Restricted cash in the consolidated balance sheets represents amounts held for the benefit of third parties and is legally or contractually restricted as to withdrawal or usage. Amounts include deposits with U.S. and non-U.S. regulatory authorities, trust funds set up for the benefit of ceding companies, and amounts pledged as collateral to meet financing arrangements.

The following table provides a reconciliation of cash and restricted cash reported within the consolidated balance sheets that total to the amounts shown in the consolidated statements of cash flows:

	March 31		December 31
(in millions of U.S. dollars)	2018		2017
Cash	$	1,988	$	728
Restricted cash	125		123
Total cash and restricted cash shown in the consolidated statements of cash flows	$	2,113	$	851

c) Goodwill

During the three months ended March 31, 2018, Goodwill increased $145 million, primarily reflecting the impact of foreign exchange.

d) Accounting guidance adopted in 2018

Revenue from Contracts with Customers

In May 2014, the FASB issued an accounting standard that supersedes most existing revenue recognition guidance. The standard excludes from its scope the accounting for insurance contracts, leases, financial instruments, and certain other agreements that are governed under other GAAP guidance, but could affect the revenue recognition for certain of our claims management and risk control services. The updated guidance requires an entity to recognize revenue as performance obligations are met, in order to reflect the transfer of promised goods or services to customers in an amount that reflects the consideration the entity is entitled to receive for those goods or services. This guidance was effective for us on January 1, 2018. The adoption of this guidance did not have a material impact on our financial condition or results of operations given that the majority of our business is outside the scope of this guidance.

Financial Instruments – Recognition and Measurement of Financial Assets and Financial Liabilities

Effective January 2018, we adopted new accounting guidance on "Recognition and Measurement of Financial Assets and Financial Liabilities" on a modified-retrospective basis. The guidance requires equity investments, other than those accounted for under the equity method of accounting, to be measured at fair value with changes in fair value recognized through net income. The guidance impacts our public equities and cost-method private equities. As a result, we recorded a cumulative-effect adjustment to increase beginning Retained earnings by $416 million after tax ($454 million pre-tax), representing the unrealized appreciation on our equity investments with an offsetting adjustment to decrease Accumulated other comprehensive income. All subsequent changes in fair value of our equity investments are recognized within realized gains (losses) on the consolidated statement of operations. Prior period amounts have not been adjusted and continue to be reported in accordance with the previous accounting guidance.

Income Taxes

Effective January 2018, we adopted new accounting guidance on “Intra-Entity Transfers of Assets Other Than Inventory” on a modified-retrospective basis. Under the new guidance, we will no longer defer taxes on intra-company asset transfers and will recognize income tax expense (benefit) immediately through the income statement. As a result, we recorded a cumulative-effect adjustment to decrease beginning Retained earnings by $7 million representing the removal of the deferred tax asset for previous intra-company asset transfer transactions not yet recognized through earnings.

Income Tax Accounting Implications of the Tax Cuts and Jobs Act

The Tax Cuts and Jobs Act (2017 Tax Act) was signed into legislation in December 2017. The Securities and Exchange Commission issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act, which provides guidance for the application of the 2017 Tax Act. The income tax guidance allows for the transition impact of the 2017 Tax Act to be recorded as 1) complete with all accounting implications identified, 2) provisional based on a reasonable estimate, or 3) not recorded as no reasonable estimate was determinable.

In December 2017, we recorded a $450 million income tax transition benefit on a provisional basis under SAB 118. There were no changes to this estimate for the current period as we continue to analyze the impact of the 2017 Tax Act.

Refer to the2017 Form 10-K for information on other accounting guidance not yet adopted.

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Investments

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Investments

Investments

a) Fixed maturities

March 31, 2018	Amortized Cost		Gross Unrealized Appreciation		Gross Unrealized Depreciation			Fair Value		OTTI Recognized in AOCI
(in millions of U.S. dollars)
Available for sale
U.S. Treasury and agency	$	3,893	$	22	$	(77	)	$	3,838	$	—
Foreign	21,705		513		(187		)	22,031		—
Corporate securities	23,509		332		(274		)	23,567		(4		)
Mortgage-backed securities	16,116		53		(349		)	15,820		(1		)
States, municipalities, and political subdivisions	13,985		61		(191		)	13,855		—
	$	79,208	$	981	$	(1,078	)	$	79,111	$	(5	)
Held to maturity
U.S. Treasury and agency	$	1,037	$	9	$	(14	)	$	1,032	$	—
Foreign	1,754		17		(20		)	1,751		—
Corporate securities	3,026		26		(55		)	2,997		—
Mortgage-backed securities	2,681		11		(45		)	2,647		—
States, municipalities, and political subdivisions	5,755		18		(78		)	5,695		—
	$	14,253	$	81	$	(212	)	$	14,122	$	—

December 31, 2017	Amortized Cost		Gross Unrealized Appreciation		Gross Unrealized Depreciation			Fair Value		OTTI Recognized in AOCI
(in millions of U.S. dollars)
Available for sale
U.S. Treasury and agency	$	3,701	$	32	$	(35	)	$	3,698	$	—
Foreign	20,514		622		(106		)	21,030		(1		)
Corporate securities	23,453		638		(95		)	23,996		(4		)
Mortgage-backed securities	15,279		111		(100		)	15,290		(1		)
States, municipalities, and political subdivisions	14,888		125		(88		)	14,925		—
	$	77,835	$	1,528	$	(424	)	$	78,939	$	(6	)
Held to maturity
U.S. Treasury and agency	$	908	$	12	$	(5	)	$	915	$	—
Foreign	1,738		27		(8		)	1,757		—
Corporate securities	3,159		67		(7		)	3,219		—
Mortgage-backed securities	2,724		23		(5		)	2,742		—
States, municipalities, and political subdivisions	5,806		50		(15		)	5,841		—
	$	14,335	$	179	$	(40	)	$	14,474	$	—

As discussed in Note 2b), if a credit loss is incurred on an impaired fixed maturity, an OTTI is considered to have occurred and the portion of the impairment not related to credit losses (non-credit OTTI) is recognized in OCI. Included in the “OTTI Recognized in AOCI” columns above are the cumulative amounts of non-credit OTTI recognized in OCI adjusted for subsequent sales, maturities, and redemptions. OTTI recognized in AOCI does not include the impact of subsequent changes in fair value of the related securities. In periods subsequent to a recognition of OTTI in OCI, changes in the fair value of the related fixed maturities are reflected in Net unrealized appreciation on investments in the Consolidated statements of shareholders’ equity. For the three months ended March 31, 2018 and 2017, $4 million and nil, respectively, of net unrealized depreciation related to such securities is included in OCI. At March 31, 2018 and December 31, 2017, AOCI included cumulative net unrealized appreciation of $3 million and $7 million, respectively, related to securities remaining in the investment portfolio for which a non-credit OTTI was recognized.

Mortgage-backed securities (MBS) issued by U.S. government agencies are combined with all other to be announced mortgage-backed securities (TBAs) held (refer to Note 6 c) (iv)) and are included in the category, “Mortgage-backed securities”. Approximately 82 percent and83 percent of the total mortgage-backed securities at March 31, 2018 and December 31, 2017, respectively, are represented by investments in U.S. government agency bonds. The remainder of the mortgage exposure consists of collateralized mortgage obligations and non-government mortgage-backed securities, the majority of which provide a planned structure for principal and interest payments and carry a rating of AAA by the major credit rating agencies.

The following table presents fixed maturities by contractual maturity:

			March 31				December 31
			2018				2017
(in millions of U.S. dollars)	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Available for sale
Due in 1 year or less	$	3,735	$	3,746	$	3,164	$	3,182
Due after 1 year through 5 years	25,140		25,251		24,749		25,068
Due after 5 years through 10 years	25,243		25,097		25,388		25,704
Due after 10 years	8,974		9,197		9,255		9,695
	63,092		63,291		62,556		63,649
Mortgage-backed securities	16,116		15,820		15,279		15,290
	$	79,208	$	79,111	$	77,835	$	78,939
Held to maturity
Due in 1 year or less	$	838	$	840	$	743	$	746
Due after 1 year through 5 years	2,684		2,678		2,669		2,688
Due after 5 years through 10 years	4,713		4,635		4,744		4,756
Due after 10 years	3,337		3,322		3,455		3,542
	11,572		11,475		11,611		11,732
Mortgage-backed securities	2,681		2,647		2,724		2,742
	$	14,253	$	14,122	$	14,335	$	14,474

Expected maturities could differ from contractual maturities because borrowers may have the right to call or prepay obligations, with or without call or prepayment penalties. 

b) Net realized gains (losses)

In accordance with guidance related to the recognition and presentation of OTTI, when an impairment related to a fixed maturity has occurred, OTTI is required to be recorded in Net income if management has the intent to sell the security or it is more likely than not that we will be required to sell the security before the recovery of its amortized cost. Further, in cases where we do not intend to sell the security and it is more likely than not that we will not be required to sell the security, we must evaluate the security to determine the portion of the impairment, if any, related to credit losses. If a credit loss is incurred, an OTTI is considered to have occurred and any portion of the OTTI related to credit losses must be reflected in Net income while the portion of OTTI related to all other factors is recognized in OCI. For fixed maturities held to maturity, OTTI recognized in OCI is accreted from AOCI to the amortized cost of the fixed maturity prospectively over the remaining term of the securities.

Each quarter, securities in an unrealized loss position (impaired securities), including fixed maturities and securities lending collateralare reviewed to identify impaired securities to be specifically evaluated for a potential OTTI. Refer to the 2017 Form 10-K for information on our evaluation of OTTI for all non-fixed maturities prior to our adoption of new accounting guidance on financial instruments, effective January 1, 2018.

Evaluation of potential credit losses related to fixed maturities

We review each fixed maturity in an unrealized loss position to assess whether the security is a candidate for credit loss. Specifically, we consider credit rating, market price, and issuer-specific financial information, among other factors, to assess the likelihood of collection of all principal and interest as contractually due. Securities for which we determine that credit loss is likely are subjected to further analysis to estimate the credit loss recognized in Net income, if any. In general, credit loss recognized in Net income equals the difference between the security’s amortized cost and the net present value of its projected future cash flows discounted at the effective interest rate implicit in the debt security. All significant assumptions used in determining credit losses are subject to change as market conditions evolve.

Corporate securities

Projected cash flows for corporate securities (principally senior unsecured bonds) are driven primarily by assumptions regarding probability of default and also the timing and amount of recoveries associated with defaults. Chubb developed projected cash flows for corporate securities using market observable data, issuer-specific information, and credit ratings. We use historical default data by Moody’s Investors Service (Moody’s) rating category to calculate a 1-in-100 year probability of default, which results in a default assumption in excess of the historical mean default rate. Consistent with management's approach, Chubb assumed a 32 percent recovery rate (the par value of a defaulted security that will be recovered) across all rating categories rather than using Moody's historical mean recovery rate of 42 percent. We believe that use of a default assumption in excess of the historical mean is conservative.

For the three months ended March 31, 2018 and 2017, credit losses recognized in Net income for corporate securities were niland $1 million, respectively.

Mortgage-backed securities

For mortgage-backed securities, credit impairment is assessed using a cash flow model that estimates the cash flows on the underlying mortgages, using the security-specific collateral and transaction structure. The model estimates cash flows from the underlying mortgage loans and distributes those cash flows to various tranches of securities, considering the transaction structure and any subordination and credit enhancements that exist in that structure. The cash flow model incorporates actual cash flows on the mortgage-backed securities through the current period and then projects the remaining cash flows using a number of assumptions, including default rates, prepayment rates, and loss severity rates (the par value of a defaulted security that will not be recovered) on foreclosed properties.

For the three months ended March 31, 2018 and 2017, there were no credit losses recognized in Net income for mortgage-backed securities.

The following table presents the components of Net realized gains (losses):

	Three Months Ended
	March 31
(in millions of U.S. dollars)	2018			2017
Fixed maturities:
OTTI on fixed maturities, gross	$	(1	)	$	(6	)
OTTI on fixed maturities recognized in OCI (pre-tax)	—			—
OTTI on fixed maturities, net	(1		)	(6		)
Gross realized gains excluding OTTI	66			34
Gross realized losses excluding OTTI	(88		)	(40		)
Total fixed maturities	(23		)	(12		)
Equity securities:
OTTI on equity securities	—			(5		)
Gross realized gains excluding OTTI	10			9
Gross realized losses excluding OTTI	(21		)	—
Total equity securities	(11		)	4
OTTI on other investments	—			(8		)
Other investments	29			—
Foreign exchange losses	(77		)	(19		)
Investment and embedded derivative instruments	17			6
Fair value adjustments on insurance derivative	38			93
S&P put options and futures	22			(74		)
Other derivative instruments	2			2
Other	1			1
Net realized gains (losses)	$	(2	)	$	(7	)

The following table presents a roll-forward of pre-tax credit losses related to fixed maturities for which a portion of OTTI was recognized in OCI:

	Three Months Ended
	March 31
(in millions of U.S. dollars)	2018			2017
Balance of credit losses related to securities still held – beginning of period	$	22		$	35
Additions where no OTTI was previously recorded	—			—
Additions where an OTTI was previously recorded	—			1
Reductions for securities sold during the period	(7		)	(4		)
Balance of credit losses related to securities still held – end of period	$	15		$	32

c) Equity securities and Other investments

Effective January 1, 2018, we adopted new accounting guidance that requires any changes in fair value of equity securities and other investments that are accounted for under the cost-method to be recognized immediately in realized gains and losses in net income. As a result, beginning on January 1, 2018, realized gains and losses from these investments include both sales of securities and unrealized gains and losses as follows:

	Three Months Ended
	March 31, 2018
(in millions of U.S. dollars)	Equity Securities			Other Investments
Net gains (losses) recognized during the period	$	(11	)	$	29
Less: Net gains (losses) recognized from sales of securities	10			—
Unrealized gains (losses) recognized for securities still held at reporting date	$	(21	)	$	29

At December 31, 2017, the cost, gross unrealized appreciation, gross unrealized depreciation, and fair value of equity securities was $737 million, $212 million, $12 million, and $937 million, respectively. At December 31, 2017, the net unrealized appreciation (depreciation) was recorded within accumulated other comprehensive income on the balance sheet.

d) Gross unrealized loss

At March 31, 2018, there were 15,699 fixed maturities out of a total of 31,179 fixed maturities in an unrealized loss position. The largest single unrealized loss in the fixed maturities was $10 million. Fixed maturities in an unrealized loss position at March 31, 2018, comprised both investment grade and below investment grade securities for which fair value declined primarily due to widening credit spreads since the date of purchase.

The following tables present, for all securities in an unrealized loss position (including securities on loan), the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position:

	0 – 12 Months					Over 12 Months					Total
March 31, 2018	Fair Value		Gross Unrealized Loss			Fair Value		Gross Unrealized Loss			Fair Value		Gross Unrealized Loss
(in millions of U.S. dollars)
U.S. Treasury and agency	$	2,869	$	(55	)	$	1,314	$	(36	)	$	4,183	$	(91	)
Foreign	8,715		(155		)	1,643		(52		)	10,358		(207		)
Corporate securities	12,355		(260		)	1,501		(69		)	13,856		(329		)
Mortgage-backed securities	12,313		(257		)	3,033		(137		)	15,346		(394		)
States, municipalities, and political subdivisions	15,030		(218		)	1,343		(51		)	16,373		(269		)
Total fixed maturities	$	51,282	$	(945	)	$	8,834	$	(345	)	$	60,116	$	(1,290	)

	0 – 12 Months					Over 12 Months					Total
December 31, 2017	Fair Value		Gross Unrealized Loss			Fair Value		Gross Unrealized Loss			Fair Value		Gross Unrealized Loss
(in millions of U.S. dollars)
U.S. Treasury and agency	$	2,172	$	(14	)	$	1,249	$	(26	)	$	3,421	$	(40	)
Foreign	5,657		(65		)	1,693		(49		)	7,350		(114		)
Corporate securities	5,210		(56		)	1,332		(46		)	6,542		(102		)
Mortgage-backed securities	6,194		(31		)	3,209		(74		)	9,403		(105		)
States, municipalities, and political subdivisions	9,259		(71		)	1,402		(32		)	10,661		(103		)
Total fixed maturities	28,492		(237		)	8,885		(227		)	37,377		(464		)
Equity securities	115		(12		)	—		—			115		(12		)
Other investments	78		(8		)	—		—			78		(8		)
Total	$	28,685	$	(257	)	$	8,885	$	(227	)	$	37,570	$	(484	)

e) Restricted assets

Chubb is required to maintain assets on deposit with various regulatory authorities to support its insurance and reinsurance operations. These requirements are generally promulgated in the statutory regulations of the individual jurisdictions. The assets on deposit are available to settle insurance and reinsurance liabilities. Chubb is also required to restrict assets pledged under repurchase agreements, which represent Chubb's agreement to sell securities and repurchase them at a future date for a predetermined price. We also use trust funds in certain large reinsurance transactions where the trust funds are set up for the benefit of the ceding companies and generally take the place of letter of credit (LOC) requirements. We also have investments in segregated portfolios primarily to provide collateral or guarantees for LOC and derivative transactions. Included in restricted assets at March 31, 2018 and December 31, 2017 are investments, primarily fixed maturities, totaling $23.6 billion and $23.3 billion, respectively, and cash of $125 million and $123 million, respectively.

The following table presents the components of restricted assets:

	March 31		December 31
(in millions of U.S. dollars)	2018		2017
Trust funds	$	17,029	$	17,011
Deposits with U.S. regulatory authorities	2,463		2,345
Deposits with non-U.S. regulatory authorities	2,290		2,250
Assets pledged under repurchase agreements	1,460		1,434
Other pledged assets	433		414
	$	23,675	$	23,454

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Fair value measurements

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair value measurements

Fair value measurements

a) Fair value hierarchy

Fair value of financial assets and financial liabilities is estimated based on the framework established in the fair value accounting guidance. The guidance defines fair value as the price to sell an asset or transfer a liability (an exit price) in an orderly transaction between market participants and establishes a three-level valuation hierarchy based on the reliability of the inputs. The fair value hierarchy gives the highest priority to quoted prices in active markets and the lowest priority to unobservable data.

The three levels of the hierarchy are as follows:

• Level 1 – Unadjusted quoted prices for identical assets or liabilities in active markets;

• Level 2 – Includes, among other items, inputs other than quoted prices that are observable for the asset or liability such as

interest rates and yield curves, quoted prices for similar assets and liabilities in active markets, and quoted prices for identical or similar assets and liabilities in markets that are not active; and

• Level 3 – Inputs that are unobservable and reflect management’s judgments about assumptions that market participants

would use in pricing an asset or liability.

We categorize financial instruments within the valuation hierarchy at the balance sheet date based upon the lowest level of inputs that are significant to the fair value measurement. Accordingly, transfers between levels within the valuation hierarchy occur when there are significant changes to the inputs, such as increases or decreases in market activity, changes to the availability of current prices, changes to the transparency to underlying inputs, and whether there are significant variances in quoted prices. Transfers in and/or out of any level are assumed to occur at the end of the period.

We use pricing services to obtain fair value measurements for the majority of our investment securities. Based on management’s understanding of the methodologies used, these pricing services only produce an estimate of fair value if there is observable market information that would allow them to make a fair value estimate. Based on our understanding of the market inputs used by the pricing services, all applicable investments have been valued in accordance with GAAP. We do not adjust prices obtained from pricing services. The following is a description of the valuation techniques and inputs used to determine fair values for financial instruments carried at fair value, as well as the general classification of such financial instruments pursuant to the valuation hierarchy.

Fixed maturities

We use pricing services to estimate fair value measurements for the majority of our fixed maturities. The pricing services use market quotations for fixed maturities that have quoted prices in active markets; such securities are classified within Level 1. For fixed maturities other than U.S. Treasury securities that generally do not trade on a daily basis, the pricing services prepare estimates of fair value measurements using their pricing applications, which include available relevant market information, benchmark curves, benchmarking of like securities, sector groupings, and matrix pricing. Additional valuation factors that can be taken into account are nominal spreads, dollar basis, and liquidity adjustments. The pricing services evaluate each asset class based on relevant market and credit information, perceived market movements, and sector news. The market inputs used in the pricing evaluation, listed in the approximate order of priority include: benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, reference data, and industry and economic events. The extent of the use of each input is dependent on the asset class and the market conditions. Given the asset class, the priority of the use of inputs may change, or some market inputs may not be relevant. Additionally, fixed maturities valuation is more subjective when markets are less liquid due to the lack of market based inputs (i.e., stale pricing), which may increase the potential that an investment's estimated fair value is not reflective of the price at which an actual transaction would occur. The overwhelming majority of fixed maturities are classified within Level 2 because the most significant inputs used in the pricing techniques are observable. For a small number of fixed maturities, we obtain a single broker quote (typically from a market maker). Due to the disclaimers on the quotes that indicate that the price is indicative only, we include these fair value estimates in Level 3. 

Equity securities

Equity securities with active markets are classified within Level 1 as fair values are based on quoted market prices. For equity securities in markets which are less active, fair values are based on market valuations and are classified within Level 2. Equity securities for which pricing is unobservable are classified within Level 3.

Short-term investments

Short-term investments, which comprise securities due to mature within one year of the date of purchase that are traded in active markets, are classified within Level 1 as fair values are based on quoted market prices. Securities such as commercial paper and discount notes are classified within Level 2 because these securities are typically not actively traded due to their approaching maturity and, as such, their cost approximates fair value. Short-term investments for which pricing is unobservable are classified within Level 3.

Other investments

Fair values for the majority of Other investments including investments in partially-owned investment companies, investment funds, and limited partnerships are based on their respective net asset values or equivalent (NAV) and are excluded from the fair value hierarchy table below. Certain of our long-duration contracts are supported by assets that do not qualify for separate account reporting under GAAP. These assets comprise mutual funds classified within Level 1 in the valuation hierarchy on the same basis as other equity securities traded in active markets. Other investments also include equity securities classified within Level 1, and fixed maturities, classified within Level 2, held in rabbi trusts maintained by Chubb for deferred compensation plans and are classified within the valuation hierarchy on the same basis as other equity securities and fixed maturities. Other investments for which pricing is unobservable are classified within Level 3.

Securities lending collateral

The underlying assets included in Securities lending collateral in the Consolidated balance sheets are fixed maturities which are classified in the valuation hierarchy on the same basis as other fixed maturities. Excluded from the valuation hierarchy is the corresponding liability related to Chubb’s obligation to return the collateral plus interest as it is reported at contract value and not fair value in the Consolidated balance sheets.

Investment derivative instruments

Actively traded investment derivative instruments, including futures, options, and forward contracts are classified within Level 1 as fair values are based on quoted market prices. The fair value of cross-currency swaps is based on market valuations and is classified within Level 2. Investment derivative instruments are recorded in either Other assets or Accounts payable, accrued expenses, and other liabilities in the Consolidated balance sheets.

Other derivative instruments

We generally maintain positions in other derivative instruments including exchange-traded equity futures contracts and option contracts designed to limit exposure to a severe equity market decline, which would cause an increase in expected claims and, therefore, an increase in reserves for our guaranteed minimum death benefits (GMDB) and guaranteed living benefits (GLB) reinsurance business. Our position in exchange-traded equity futures contracts is classified within Level 1. The fair value of the majority of the remaining positions in other derivative instruments is based on significant observable inputs including equity security and interest rate indices. Accordingly, these are classified within Level 2. Other derivative instruments based on unobservable inputs are classified within Level 3. Other derivative instruments are recorded in either Other assets or Accounts payable, accrued expenses, and other liabilities in the Consolidated balance sheets.

Separate account assets

Separate account assets represent segregated funds where investment risks are borne by the customers, except to the extent of certain guarantees made by Chubb. Separate account assets comprise mutual funds classified within Level 1 in the valuation hierarchy on the same basis as other equity securities traded in active markets. Separate account assets also include fixed maturities classified within Level 2 because the most significant inputs used in the pricing techniques are observable. Excluded from the valuation hierarchy are the corresponding liabilities as they are reported at contract value and not fair value in the Consolidated balance sheets. Separate account assets are recorded in Other assets in the Consolidated balance sheets.

Guaranteed living benefits

The GLB arises from life reinsurance programs covering living benefit guarantees whereby we assume the risk of guaranteed minimum income benefits (GMIB) and guaranteed minimum accumulation benefits (GMAB) associated with variable annuity contracts. GLB’s are recorded in Accounts payable, accrued expenses, and other liabilities and Future policy benefits in the Consolidated balance sheets. For GLB reinsurance, Chubb estimates fair value using an internal valuation model which includes current market information and estimates of policyholder behavior. All of the treaties contain claim limits, which are factored into the valuation model. The fair value depends on a number of factors, including interest rates, equity markets, credit risk, current account value, market volatility, expected annuitization rates and other policyholder behavior, and changes in policyholder mortality.

The most significant policyholder behavior assumptions include lapse rates and the GMIB annuitization rates. Assumptions regarding lapse rates and GMIB annuitization rates differ by treaty, but the underlying methodologies to determine rates applied to each treaty are comparable.

A lapse rate is the percentage of in-force policies surrendered in a given calendar year. All else equal, as lapse rates increase, ultimate claim payments will decrease.

The GMIB annuitization rate is the percentage of policies for which the policyholder will elect to annuitize using the guaranteed benefit provided under the GMIB. All else equal, as GMIB annuitization rates increase, ultimate claim payments will increase, subject to treaty claim limits.

The effect of changes in key market factors on assumed lapse and annuitization rates reflect emerging trends using data available from cedants. For treaties with limited experience, rates are established in line with data received from other ceding companies adjusted, as appropriate, with industry estimates. The model and related assumptions are regularly re-evaluated by management and enhanced, as appropriate, based upon additional experience obtained related to policyholder behavior and availability of updated information such as market conditions, market participant assumptions, and demographics of in-force annuities. Because of the significant use of unobservable inputs including policyholder behavior, GLB reinsurance is classified within Level 3. For the three months ended March 31, 2018 and 2017, no material technical refinements were made to the model. For detailed information on our lapse and annuitization rate assumptions, refer to Note 4 to the Consolidated Financial Statements of our 2017 Form 10-K.

Financial instruments measured at fair value on a recurring basis, by valuation hierarchy

March 31, 2018	Level 1		Level 2		Level 3		Total
(in millions of U.S. dollars)
Assets:
Fixed maturities available for sale
U.S. Treasury and agency	$	3,094	$	744	$	—	$	3,838
Foreign	—		21,855		176		22,031
Corporate securities	—		22,494		1,073		23,567
Mortgage-backed securities	—		15,737		83		15,820
States, municipalities, and political subdivisions	—		13,855		—		13,855
	3,094		74,685		1,332		79,111
Equity securities	884		—		64		948
Short-term investments	1,735		1,127		12		2,874
Other investments (1)	451		318		270		1,039
Securities lending collateral	—		2,039		—		2,039
Investment derivative instruments	25		—		—		25
Other derivative instruments	78		—		—		78
Separate account assets	2,774		100		—		2,874
Total assets measured at fair value (1)	$	9,041	$	78,269	$	1,678	$	88,988
Liabilities:
Investment derivative instruments	$	29	$	—	$	—	$	29
Other derivative instruments	—		—		2		2
GLB (2)	—		—		167		167
Total liabilities measured at fair value	$	29	$	—	$	169	$	198

⁽¹⁾  Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $3,866 million and other investments of $14 million at March 31, 2018 measured using NAV as a practical expedient.

⁽²⁾  Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets.

December 31, 2017	Level 1		Level 2		Level 3		Total
(in millions of U.S. dollars)
Assets:
Fixed maturities available for sale
U.S. Treasury and agency	$	3,129	$	569	$	—	$	3,698
Foreign	—		20,937		93		21,030
Corporate securities	—		22,959		1,037		23,996
Mortgage-backed securities	—		15,212		78		15,290
States, municipalities, and political subdivisions	—		14,925		—		14,925
	3,129		74,602		1,208		78,939
Equity securities	893		—		44		937
Short-term investments	2,309		1,252		—		3,561
Other investments (1)	466		305		263		1,034
Securities lending collateral	—		1,737		—		1,737
Investment derivative instruments	18		—		—		18
Other derivative instruments	1		—		—		1
Separate account assets	2,635		99		—		2,734
Total assets measured at fair value (1)	$	9,451	$	77,995	$	1,515	$	88,961
Liabilities:
Investment derivative instruments	$	30	$	—	$	—	$	30
Other derivative instruments	21		—		2		23
GLB (2)	—		—		204		204
Total liabilities measured at fair value	$	51	$	—	$	206	$	257

⁽¹⁾  Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $3,623 million and other investments of $15 million at December 31, 2017 measured using NAV as a practical expedient.

⁽²⁾  Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets.

There were no transfers of financial instruments between Level 1 and Level 2 for both the three months ended March 31, 2018 and 2017.

Fair value of alternative investments

Alternative investments include investment funds, limited partnerships, and partially-owned investment companies measured at fair value using NAV as a practical expedient. The following table presents, by investment category, the expected liquidation period, fair value, and maximum future funding commitments of alternative investments:

				March 31				December 31
	Expected Liquidation Period of Underlying Assets			2018				2017
(in millions of U.S. dollars)		Fair Value		Maximum Future Funding Commitments		Fair Value		Maximum Future Funding Commitments
Financial	5 to 9 Years	$	538	$	327	$	540	$	330
Real Assets	3 to 7 Years	656		210		651		114
Distressed	3 to 7 Years	295		131		289		141
Private Credit	3 to 7 Years	173		320		187		327
Traditional	3 to 15 Years	1,901		2,858		1,656		3,149
Vintage	1 to 2 Years	27		—		30		—
Investment funds	Not Applicable	276		—		270		—
		$	3,866	$	3,846	$	3,623	$	4,061

Included in all categories in the above table, except for Investment funds, are investments for which Chubb will never have the contractual option to redeem but receives distributions based on the liquidation of the underlying assets. Further, for all categories except for Investment funds, Chubb does not have the ability to sell or transfer the investments without the consent from the general partner of individual funds.

Investment Category:	Consists of investments in private equity funds:
Financial	targeting financial services companies such as financial institutions and insurance services worldwide
Real Assets	targeting investments related to hard physical assets such as real estate, infrastructure and natural resources
Distressed	targeting distressed corporate debt/credit and equity opportunities in the U.S.
Private Credit	targeting privately originated corporate debt investments including senior secured loans and subordinated bonds
Traditional	employing traditional private equity investment strategies such as buyout and growth equity globally
Vintage	made before 2002 or where the funds’ commitment periods had already expired

Investment funds

Chubb’s investment funds employ various investment strategies such as long/short equity and arbitrage/distressed. Included in this category are investments for which Chubb has the option to redeem at agreed upon value as described in each investment fund’s subscription agreement. Depending on the terms of the various subscription agreements, investment fund investments may be redeemed monthly, quarterly, semi-annually, or annually. If Chubb wishes to redeem an investment fund investment, it must first determine if the investment fund is still in a lock-up period (a time when Chubb cannot redeem its investment so that the investment fund manager has time to build the portfolio). If the investment fund is no longer in its lock-up period, Chubb must then notify the investment fund manager of its intention to redeem by the notification date prescribed by the subscription agreement. Subsequent to notification, the investment fund can redeem Chubb’s investment within several months of the notification. Notice periods for redemption of the investment funds range between 5 and 120 days. Chubb can redeem its investment funds without consent from the investment fund managers.

Level 3 financial instruments

The fair values of assets and liabilities measured at fair value using significant unobservable inputs (Level 3) consist of various inputs and assumptions that management makes when determining fair value. Management analyzes changes in fair value measurements classified within Level 3 by comparing pricing and returns of our investments to benchmarks, including month-over-month movements, investment credit spreads, interest rate movements, and credit quality of securities.

The following table presents the significant unobservable inputs used in the Level 3 liability valuations. Excluded from the table below are inputs used to determine the fair value of Level 3 assets which are based on single broker quotes and contain no quantitative unobservable inputs developed by management.

(in millions of U.S. dollars, except for percentages)	Fair Value				Valuation Technique	Significant Unobservable Inputs	Ranges
	March 31, 2018		December 31, 2017
GLB (1)	$	167	$	204	Actuarial model	Lapse rate	3% – 33%
						Annuitization rate	0% – 100%

⁽¹⁾  Discussion of the most significant inputs used in the fair value measurement of GLB and the sensitivity of those assumptions is included within Note 3 a) Guaranteed living benefits.

The following tables present a reconciliation of the beginning and ending balances of financial instruments measured at fair value using significant unobservable inputs (Level 3):

	Assets																Liabilities
Three Months Ended	Available-for-Sale Debt Securities								Equity securities		Short-term investments			Other investments			Other derivative instruments		GLB (2)
March 31, 2018	Foreign			Corporate securities (1)			MBS
(in millions of U.S. dollars)
Balance – beginning of period	$	93		$	1,037		$	78	$	44	$	—		$	263		$	2	$	204
Transfers into Level 3	7			—			1		—		5			—			—		—
Transfers out of Level 3	—			(10		)	—		—		—			—			—		—
Change in Net Unrealized Gains (Losses) included in OCI, including Foreign Exchange	9			(3		)	—		1		—			2			—		—
Net Realized Gains/Losses	—			—			—		2		—			—			—		(37		)
Purchases	87			139			4		17		8			14			—		—
Sales	(19		)	(51		)	—		—		—			—			—		—
Settlements	(1		)	(39		)	—		—		(1		)	(9		)	—		—
Balance – end of period	$	176		$	1,073		$	83	$	64	$	12		$	270		$	2	$	167
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date	$	—		$	—		$	—	$	—	$	—		$	—		$	—	$	(37	)

⁽¹⁾  Purchases in Level 3 primarily consist of privately-placed fixed income securities.

⁽²⁾  Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $529 million at March 31, 2018, and $550 million at December 31, 2017, which includes a fair value derivative adjustment of $167 million and $204 million, respectively.

	Assets																				Liabilities
Three Months Ended	Available-for-Sale Debt Securities									Equity securities		Short-term investments			Other investments			Other derivative instruments			GLB (1)
March 31, 2017	Foreign			Corporate securities			MBS
(in millions of U.S. dollars)
Balance – beginning of period	$	74		$	681		$	45		$	41	$	25		$	225		$	13		$	559
Transfers into Level 3	—			29			—			—		—			—			—			—
Transfers out of Level 3	—			(54		)	—			—		—			—			—			—
Change in Net Unrealized Gains (Losses) included in OCI	(1		)	(8		)	—			—		—			4			—			—
Net Realized Gains/Losses	(1		)	(1		)	—			—		—			—			(2		)	(93		)
Purchases	14			156			1			—		7			8			—			—
Sales	(3		)	(27		)	(1		)	—		—			—			—			—
Settlements	(3		)	(39		)	—			—		(11		)	(4		)	—			—
Balance – end of period	$	80		$	737		$	45		$	41	$	21		$	233		$	11		$	466
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date	$	—		$	—		$	—		$	—	$	—		$	—		$	(2	)	$	(93	)

⁽¹⁾  Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $774 million at March 31, 2017, and $853 million at December 31, 2016, which includes a fair value derivative adjustment of $466 million and $559 million, respectively.

b) Financial instruments disclosed, but not measured, at fair value

Chubb uses various financial instruments in the normal course of its business. Our insurance contracts are excluded from fair value of financial instruments accounting guidance, and therefore, are not included in the amounts discussed below.

The carrying values of cash, other assets, other liabilities, and other financial instruments not included below approximated their fair values.

Refer to the 2017 Form 10-K for information on the fair value methods and assumptions for investments in partially-owned insurance companies, short-term and long-term debt, repurchase agreements, and trust-preferred securities.

The following tables present fair value, by valuation hierarchy, and carrying value of the financial instruments not measured at fair value:

March 31, 2018	Fair Value								Carrying Value
(in millions of U.S. dollars)	Level 1		Level 2		Level 3		Total
Assets:
Fixed maturities held to maturity
U.S. Treasury and agency	$	977	$	55	$	—	$	1,032	$	1,037
Foreign	—		1,751		—		1,751		1,754
Corporate securities	—		2,964		33		2,997		3,026
Mortgage-backed securities	—		2,647		—		2,647		2,681
States, municipalities, and political subdivisions	—		5,695		—		5,695		5,755
Total assets	$	977	$	13,112	$	33	$	14,122	$	14,253
Liabilities:
Repurchase agreements	$	—	$	1,412	$	—	$	1,412	$	1,412
Short-term debt	—		1,704		—		1,704		1,669
Long-term debt	—		13,023		—		13,023		12,786
Trust preferred securities	—		466		—		466		308
Total liabilities	$	—	$	16,605	$	—	$	16,605	$	16,175

December 31, 2017	Fair Value								Carrying Value
(in millions of U.S. dollars)	Level 1		Level 2		Level 3		Total
Assets:
Fixed maturities held to maturity
U.S. Treasury and agency	$	857	$	58	$	—	$	915	$	908
Foreign	—		1,757		—		1,757		1,738
Corporate securities	—		3,184		35		3,219		3,159
Mortgage-backed securities	—		2,742		—		2,742		2,724
States, municipalities, and political subdivisions	—		5,841		—		5,841		5,806
Total assets	$	857	$	13,582	$	35	$	14,474	$	14,335
Liabilities:
Repurchase agreements	$	—	$	1,408	$	—	$	1,408	$	1,408
Short-term debt	—		1,013		—		1,013		1,013
Long-term debt	—		12,332		—		12,332		11,556
Trust preferred securities	—		468		—		468		308
Total liabilities	$	—	$	15,221	$	—	$	15,221	$	14,285

XML

Unpaid losses and loss expenses

3 Months Ended

Mar. 31, 2018

Liability for Claims and Claims Adjustment Expense [Abstract]

Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block]

4. Unpaid losses and loss expenses

The following table presents a reconciliation of beginning and ending Unpaid losses and loss expenses:

	Three Months Ended March 31
(in millions of U.S. dollars)	2018			2017
Gross unpaid losses and loss expenses – beginning of period	$	63,179		$	60,540
Reinsurance recoverable on unpaid losses - beginning of period (1)	(14,014		)	(12,708		)
Net unpaid losses and loss expenses – beginning of period	49,165			47,832
Net losses and loss expenses incurred in respect of losses occurring in:
Current year	4,358			4,078
Prior years (2)	(256		)	(289		)
Total	4,102			3,789
Net losses and loss expenses paid in respect of losses occurring in:
Current year	809			798
Prior years	3,433			3,109
Total	4,242			3,907
Foreign currency revaluation and other	292			54
Net unpaid losses and loss expenses – end of period	49,317			47,768
Reinsurance recoverable on unpaid losses (3)	13,822			12,811
Gross unpaid losses and loss expenses – end of period	$	63,139		$	60,579

⁽¹⁾  Net of provision for uncollectible reinsurance of $321 million and $300 million at December 31, 2017 and 2016, respectively.

⁽²⁾  Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments, and earned premiums totaling $47 million and $58 million for the three months ended March 31, 2018 and 2017, respectively.

⁽³⁾  Net of provision for uncollectible reinsurance of $320 million and $334 million at March 31, 2018 and 2017, respectively.

The increase in net unpaid losses and loss expenses from December 31, 2017 reflects the impact of catastrophic events in the quarter and foreign exchange movement, offset by favorable prior period development and catastrophe payments related to the 2017 catastrophic events.

Prior Period Development

Prior period development arises from changes to loss estimates recognized in the current year that relate to loss events that occurred in previous calendar years and excludes the effect of losses from the development of earned premium from previous accident years. Significant prior period movements by segment, principally driven by reserve reviews completed during each respective period, are discussed in more detail below. The remaining net development for long-tail lines and short-tail business for each segment and Corporate comprises numerous favorable and adverse movements across a number of lines and accident years, none of which is significant individually or in the aggregate.

Long-tail lines include lines such as workers' compensation, general liability, and professional liability; while short-tail lines include lines such as most property lines, energy, personal accident, and agriculture. During the third quarter of 2017, we determined that the loss development classification for certain businesses, previously grouped within the short-tail column in the table below, would be more appropriately grouped within the long-tail column to better align with the classification of these businesses within our loss development triangles in our Form 10-K. We also determined that the loss development for certain other businesses should be reclassified from long-tail to short-tail. We updated the 2017 North America Commercial P&C Insurance segment amounts below to conform to the current period presentation and reclassified $5 million of net favorable development into short-tail from long-tail. These changes to the previously disclosed amounts have no impact to our financial condition and results of operations.

	Three Months Ended March 31
(in millions of U.S. dollars)	Long-tail			Short-tail			Total
2018
North America Commercial P&C Insurance	$	8		$	(109	)	$	(101	)
North America Personal P&C Insurance	—			(6		)	(6		)
North America Agricultural Insurance	—			(76		)	(76		)
Overseas General Insurance	—			(22		)	(22		)
Global Reinsurance	—			(14		)	(14		)
Corporate	10			—			10
Total	$	18		$	(227	)	$	(209	)
2017
North America Commercial P&C Insurance	$	(94	)	$	(85	)	$	(179	)
North America Personal P&C Insurance	—			(3		)	(3		)
North America Agricultural Insurance	—			(79		)	(79		)
Overseas General Insurance	32			(20		)	12
Global Reinsurance	8			—			8
Corporate	10			—			10
Total	$	(44	)	$	(187	)	$	(231	)

North America Commercial P&C Insurance

2018

For the three months ended March 31, 2018, net favorable PPD was $101 million, which was the net result of several underlying favorable and adverse movements, and was driven by the following principal changes:

• Net adverse development of $8 million in long-tail business, primarily from:

• Net favorable development of $29 million in commercial excess and umbrella portfolios, driven by the 2012 and prior accident years where the cumulative emergence over time has been less than expected overall and an increase in weighting towards experience-based methods, partly offset by several large settlements; additionally there was adverse claim activity in the 2014 and 2015 accident years which led to reserve strengthening in those years;

• Net favorable development of $3 million on several lines of business due to favorable claim development on the 2017 natural catastrophes; and

• Net adverse development of $40 million, mainly in 2015, 2016 and some older accident years, partially offset by favorable development in other periods, particularly in the 2014 accident year. This net adverse development consisted of several underlying favorable and adverse movements by portfolio, principally including $16 million of adverse development in wholesale general liability lines.

• Net favorable development of $109 million in short-tail business, primarily from:

• Net favorable development of $75 million in commercial property and marine businesses due to favorable claim development on the 2017 natural catastrophes; and

• Net favorable development of $34 million, principally including $19 million in surety business. The remainder was due to several underlying favorable and adverse movements, none of which were significant individually or in the aggregate.

2017

For the three months ended March 31, 2017, net favorable PPD was $179 million, which was the net result of several underlying favorable and adverse movements, and was driven by the following principal changes:

• Net favorable development of $94 million in long-tail business, primarily from:

• Net favorable development of $74 million in our commercial excess and umbrella portfolios, primarily in accident years 2010 and prior, driven by lower than expected reported loss activity, and an increase in weighting towards experience-based methods; and

• Net favorable development of $32 million in our professional Errors and Omissions (E&O) portfolios, primarily in the 2011 through 2013 accident years, arising from lower than expected reported loss activity, partially offset by claim-specific adverse development.

• Net favorable development of $85 million in short-tail business, primarily from:

• Net favorable development of $45 million in our surety business, primarily due to lower than expected claims severity in the 2015 accident year; and

• Net favorable development of $24 million in accident & health (A&H) lines, primarily due to lower than expected loss emergence in the 2015 and 2016 accident years.

North America Personal P&C Insurance

2018

For the three months ended March 31, 2018, net favorable PPD was $6 million and was driven by claim development on the 2017 natural catastrophes.

2017

For the three months ended March 31, 2017, net favorable PPD was $3 million, which was the net result of several underlying favorable and adverse movements, none of which were significant individually or in the aggregate.

North America Agricultural Insurance

For the three months ended March 31, 2018 and 2017, net favorable PPD was $76 million and $79 million, respectively. Actual claim development relates to our Multiple Peril Crop Insurance (MPCI) business and is favorable due to better than expected crop yield results in certain states at the prior year-end period (i.e., 2018 results based on crop yield results at year-end 2017).

Overseas General Insurance

2018

For the three months ended March 31, 2018, net favorable PPD was $22 million, which was primarily driven by $12 million of claim development on the 2017 natural catastrophes.

2017

For the three months ended March 31, 2017, net adverse PPD was $12 million, which was the net result of several underlying favorable and adverse movements, and was driven by the following principal changes:

• Adverse development of $32 million in long-tail business, in our casualty lines, driven by a change in the discount rate in the U.K. (Ogden rate) impacting the 2016 and prior accident years.

• Net favorable development of $20 million in short-tail business, which was the net result of several underlying favorable and adverse movements, none of which were significant individually or in the aggregate.

Global Reinsurance

2018

For the three months ended March 31, 2018, net favorable PPD was $14 million, which was primarily driven by $10 million of claim development on the 2017 natural catastrophes.

2017

For the three months ended March 31, 2017, net adverse PPD was $8 million, which was primarily due to adverse development of $9 million in long-tail motor and excess liability lines, driven by a change in the discount rate in the U.K. (Ogden rate) impacting the 2015 and prior accident years.

Corporate

For the three months ended March 31, 2018 and 2017, adverse development was $10 million for both periods, related to unallocated loss adjustment expenses due to run-off operating expenses paid and incurred.

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Debt

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Debt Disclosure [Text Block]

Debt

In March 2018, Chubb INA Holdings Inc. (Chubb INA) issued €900 million ($1.1 billion based on the foreign exchange rate at the date of issuance) of 1.55 percent Euro denominated senior notes due March 2028 and €900 million ($1.1 billion based on the foreign exchange rate at the date of issuance) of 2.5 percent Euro denominated senior notes due March 2038. These senior notes are redeemable at any time at Chubb INA's option subject to a “make-whole” premium (the present value of the remaining principal and interest discounted at the applicable comparable government bond rate plus 0.15 percent for the senior notes due 2028 and 0.25 percent for the senior notes due 2038). The notes are also redeemable at par plus accrued and unpaid interest in the event of certain changes in tax law. These notes do not have the benefit of any sinking fund. These senior unsecured notes are guaranteed on a senior basis by Chubb and they rank equally with all of Chubb's other senior obligations. They also contain customary limitations on lien provisions as well as customary events of default provisions which, if breached, could result in the accelerated maturity of such senior debt.

Chubb INA's $300 million of 5.8 percent senior notes due March 2018 were paid upon maturity.

In March 2018, we reclassified $964 million of the 6.375 percent unsecured junior subordinated capital securities ($1.0 billion par value with the final maturity date of March 2067) from long-term to short-term debt in the Consolidated balance sheets given our intention to redeem these securities on April 6, 2018, prior to the maturity date. Subsequently, the $1.0 billion capital securities were redeemed on April 6, 2018.

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Commitments, contingencies, and guarantees

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments, contingencies, and guarantees

Commitments, contingencies, and guarantees

a) Derivative instruments

Foreign currency management

As a global company, Chubb entities transact business in multiple currencies. Our policy is to generally match assets, liabilities, and required capital for each individual jurisdiction in local currency, which would include the use of derivatives discussed below. We do not hedge our net asset non-U.S. dollar capital positions; however, we do consider economic hedging for planned cross border transactions.

Derivative instruments employed

Chubb maintains positions in derivative instruments such as futures, options, swaps, and foreign currency forward contracts for which the primary purposes are to manage duration and foreign currency exposure, yield enhancement, or to obtain an exposure to a particular financial market. Chubb also maintains positions in convertible securities that contain embedded derivatives. Investment derivative instruments are recorded in either Other assets (OA) or Accounts payable, accrued expenses, and other liabilities (AP), convertible bonds are recorded in Fixed maturities available for sale (FM AFS), and convertible equity securities are recorded in Equity securities (ES) in the Consolidated balance sheets. These are the most numerous and frequent derivative transactions. In addition, Chubb from time to time purchases to be announced mortgage-backed securities (TBAs) as part of its investing activities.

Under reinsurance programs covering GLBs, Chubb assumes the risk of GLBs, including GMIB and GMAB, associated with variable annuity contracts. The GMIB risk is triggered if, at the time the contract holder elects to convert the accumulated account value to a periodic payment stream (annuitize), the accumulated account value is not sufficient to provide a guaranteed minimum level of monthly income. The GMAB risk is triggered if, at contract maturity, the contract holder’s account value is less than a guaranteed minimum value. The GLB reinsurance product meets the definition of a derivative instrument. Benefit reserves in respect of GLBs are classified as Future policy benefits (FPB) while the fair value derivative adjustment is classified within AP. Chubb also generally maintains positions in exchange-traded equity futures contracts on equity market indices to limit equity exposure in the GMDB and GLB blocks of business.

All derivative instruments are carried at fair value with changes in fair value recorded in Net realized gains (losses) in the Consolidated statements of operations. None of the derivative instruments are designated as hedges for accounting purposes.

The following table presents the balance sheet locations, fair values of derivative instruments in an asset or (liability) position, and notional values/payment provisions of our derivative instruments:

				March 31, 2018							December 31, 2017
	Consolidated Balance Sheet Location	Fair Value					Notional Value/ Payment Provision		Fair Value					Notional Value/ Payment Provision
(in millions of U.S. dollars)		Derivative Asset		Derivative (Liability)					Derivative Asset		Derivative (Liability)
Investment and embedded derivative instruments:
Foreign currency forward contracts	OA / (AP)	$	19	$	(17	)	$	2,125	$	14	$	(27	)	$	2,064
Cross-currency swaps	OA / (AP)	—		—			45		—		—			45
Options/Futures contracts on notes and bonds	OA / (AP)	6		(12		)	1,093		4		(3		)	1,007
Convertible securities (1)	FM AFS / ES	7		—			8		5		—			6
		$	32	$	(29	)	$	3,271	$	23	$	(30	)	$	3,122
Other derivative instruments:
Futures contracts on equities(2)	OA / (AP)	$	71	$	—		$	1,625	$	—	$	(21	)	$	1,553
Other	OA / (AP)	7		(2		)	326		1		(2		)	75
		$	78	$	(2	)	$	1,951	$	1	$	(23	)	$	1,628
GLB (3)	(AP) / (FPB)	$	—	$	(529	)	$	1,175	$	—	$	(550	)	$	1,083

⁽¹⁾  Includes fair value of embedded derivatives.

⁽²⁾  Related to GMDB and GLB blocks of business.

⁽³⁾  Includes both future policy benefits reserves and fair value derivative adjustment. Note that the payment provision related to GLB is the net amount at risk. The concept of a notional value does not apply to the GLB reinsurance contracts.

At March 31, 2018 and December 31, 2017, derivative assets of $79 million and derivative liabilities of $24 million, respectively, included in the table above were subject to a master netting agreement. The remaining derivatives included in the table above were not subject to a master netting agreement. 

b) Secured borrowings

Chubb participates in a securities lending program operated by a third-party banking institution whereby certain assets are loaned to qualified borrowers and from which we earn an incremental return. The securities lending collateral can only be drawn down by Chubb in the event that the institution borrowing the securities is in default under the lending agreement. An indemnification agreement with the lending agent protects us in the event a borrower becomes insolvent or fails to return any of the securities on loan.The collateral is recorded in Securities lending collateral and the liability is recorded in Securities lending payable in the Consolidated balance sheets.

Potential risks exist in our secured borrowing transactions due to market conditions and counterparty exposure. With collateral that we pledge, there is a risk that the collateral may not be returned at the expiration of the agreement. If the counterparty fails to return the collateral, Chubb will have free use of the borrowed funds until our collateral is returned. In addition, we may encounter the risk that Chubb may not be able to renew outstanding borrowings with a new term or with an existing counterparty due to market conditions including a decrease in demand as well as more restrictive terms from banks due to increased regulatory and capital constraints. Should this condition occur, Chubb may seek alternative borrowing sources or reduce borrowings. Additionally, increased margins and collateral requirements due to market conditions would increase our restricted assets as we are required to provide additional collateral to support the transaction.

The following table presents the carrying value of collateral held under securities lending agreements by investment category and remaining contractual maturity of the underlying agreements:

	Remaining contractual maturity
	March 31		December 31
	2018		2017
(in millions of U.S. dollars)	Overnight and Continuous
Collateral held under securities lending agreements:
Cash	$	826	$	828
U.S. Treasury and agency	40		36
Foreign	869		712
Corporate securities	8		—
Mortgage-backed securities	59		74
Equity securities	237		87
	$	2,039	$	1,737
Gross amount of recognized liability for securities lending payable	$	2,039	$	1,737

AtMarch 31, 2018and December 31, 2017, our repurchase agreement obligations of$1,412 millionand$1,408 million, respectively, were fully collateralized. In contrast to securities lending programs, the use of cash received is not restricted for the repurchase obligations.The fair value of the underlying securities sold remains in Fixed maturities available for sale and the repurchase agreement obligation is recorded in Repurchase agreements in the Consolidated balance sheets.  

The following table presents the carrying value of collateral pledged under repurchase agreements by investment category and remaining contractual maturity of the underlying agreements:

	Remaining contractual maturity
	March 31, 2018						December 31, 2017
	30-90 Days		Greater than 90 Days		Total		Up to 30 Days		Greater than 90 Days		Total
(in millions of U.S. dollars)
Collateral pledged under repurchase agreements:
U.S. Treasury and agency	$	—	$	243	$	243	$	9	$	230	$	239
Mortgage-backed securities	486		731		1,217		369		826		1,195
	$	486	$	974	$	1,460	$	378	$	1,056	$	1,434
Gross amount of recognized liabilities for repurchase agreements					$	1,412					$	1,408
Difference (1)					$	48					$	26

⁽¹⁾  Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability.

The following table presents net realized gains (losses) related to derivative instrument activity in the Consolidated statements of operations:

	Three Months Ended
	March 31
(in millions of U.S. dollars)	2018		2017
Investment and embedded derivative instruments:
Foreign currency forward contracts	$	4	$	14
All other futures contracts and options	13		(8		)
Total investment and embedded derivative instruments	$	17	$	6
GLB and other derivative instruments:
GLB (1)	$	38	$	93
Futures contracts on equities (2)	22		(74		)
Other	2		2
Total GLB and other derivative instruments	$	62	$	21
	$	79	$	27

⁽¹⁾  Excludes foreign exchange gains (losses) related to GLB.

⁽²⁾  Related to GMDB and GLB blocks of business.

c) Derivative instrument objectives

(i) Foreign currency exposure management

A foreign currency forward contract (forward) is an agreement between participants to exchange specific foreign currencies at a future date. Chubb uses forwards to minimize the effect of fluctuating foreign currencies as discussed above.

(ii) Duration management and market exposure

Futures

Futures contracts give the holder the right and obligation to participate in market movements, determined by the index or underlying security on which the futures contract is based. Settlement is made daily in cash by an amount equal to the change in value of the futures contract times a multiplier that scales the size of the contract. Exchange-traded futures contracts on money market instruments, notes, and bonds are used in fixed maturity portfolios to more efficiently manage duration, as substitutes for ownership of the money market instruments, bonds, and notes without significantly increasing the risk in the portfolio. Investments in futures contracts may be made only to the extent that there are assets under management not otherwise committed.

Exchange-traded equity futures contracts are used to limit exposure to a severe equity market decline, which would cause an increase in expected claims and therefore, an increase in reserves for GMDB and GLB reinsurance business.

Options

An option contract conveys to the holder the right, but not the obligation, to purchase or sell a specified amount or value of an underlying security at a fixed price. Option contracts are used in the investment portfolio as protection against unexpected shifts in interest rates, which would affect the duration of the fixed maturity portfolio. By using options in the portfolio, the overall interest rate sensitivity of the portfolio can be reduced. Option contracts may also be used as an alternative to futures contracts in the synthetic strategy as described above.

The price of an option is influenced by the underlying security, expected volatility, time to expiration, and supply and demand.

The credit risk associated with the above derivative financial instruments relates to the potential for non-performance by counterparties. Although non-performance is not anticipated, in order to minimize the risk of loss, management monitors the creditworthiness of its counterparties and obtains collateral. The performance of exchange-traded instruments is guaranteed by the exchange on which they trade. For non-exchange-traded instruments, the counterparties are principally banks which must meet certain criteria according to our investment guidelines.

Cross-currency swaps

Cross-currency swaps are agreements under which two counterparties exchange interest payments and principal denominated in different currencies at a future date. We use cross-currency swaps to reduce the foreign currency and interest rate risk by converting cash flows back into local currency. We invest in foreign currency denominated investments to improve credit diversification and also to obtain better duration matching to our liabilities that is limited in the local currency market.

Other

Included within Other are derivatives intended to reduce potential losses which may arise from certain exposures in our insurance business. The economic benefit provided by these derivatives is similar to purchased reinsurance. For example, Chubb may enter into crop derivative contracts to protect underwriting results in the event of a significant decline in commodity prices.

(iii) Convertible security investments

A convertible security is a debt instrument or preferred stock that can be converted into a predetermined amount of the issuer’s equity. The convertible option is an embedded derivative within the host instruments which are classified in the investment portfolio as either available for sale or as an equity security. Chubb purchases convertible securities for their total return and not specifically for the conversion feature.

(iv) TBA

By acquiring TBAs, we make a commitment to purchase a future issuance of mortgage-backed securities. For the period between purchase of the TBAs and issuance of the underlying security, we account for our position as a derivative in the consolidated financial statements. Chubb purchases TBAs both for their total return and for the flexibility they provide related to our mortgage-backed security strategy.

(v) GLB

Under the GLB program, as the assuming entity, Chubb is obligated to provide coverage until the expiration or maturity of the underlying deferred annuity contracts or the expiry of the reinsurance treaty. Premiums received under the reinsurance treaties are classified as premium. Expected losses allocated to premiums received are classified as Future policy benefits and valued similar to GMDB reinsurance. Other changes in fair value, principally arising from changes in expected losses allocated to expected future premiums, are classified as Net realized gains (losses). Fair value represents management’s estimate of an exit price and thus, includes a risk margin. We may recognize a realized loss for other changes in fair value due to adverse changes in the capital markets (e.g., declining interest rates and/or declining equity markets) and changes in actual or estimated future policyholder behavior (e.g., increased annuitization or decreased lapse rates) although we expect the business to be profitable. We believe this presentation provides the most meaningful disclosure of changes in the underlying risk within the GLB reinsurance programs for a given reporting period.

d) Fixed maturities

At March 31, 2018, we have commitments to purchase fixed income securities of $1,139 million over the next several years.

e) Other investments

At March 31, 2018, included in Other investments in the Consolidated balance sheets are investments in limited partnerships and partially-owned investment companies with a carrying value of $3.6 billion. In connection with these investments, we have commitments that may require funding of up to $3.8 billion over the next several years.

f) Taxation

At March 31, 2018, $14 million of unrecognized tax benefits remain outstanding. It is reasonably possible that over the next twelve months, the amount of unrecognized tax benefits may change resulting from the re-evaluation of unrecognized tax benefits arising from examinations of taxing authorities and the closing of tax statute limitations. With few exceptions, Chubb is no longer subject to state and local or non-U.S. income tax examinations for years before 2010.

g) Legal proceedings

Our insurance subsidiaries are subject to claims litigation involving disputed interpretations of policy coverages and, in some jurisdictions, direct actions by allegedly-injured persons seeking damages from policyholders. These lawsuits, involving claims on policies issued by our subsidiaries which are typical to the insurance industry in general and in the normal course of business, are considered in our loss and loss expense reserves. In addition to claims litigation, we are subject to lawsuits and regulatory actions in the normal course of business that do not arise from or directly relate to claims on insurance policies. This category of business litigation typically involves, among other things, allegations of underwriting errors or misconduct, employment claims, regulatory activity, or disputes arising from our business ventures. In the opinion of management, our ultimate liability for these matters could be, but we believe is not likely to be, material to our consolidated financial condition and results of operations.

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Share-based compensation

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-based compensation

Share-based compensation

The Chubb Limited 2016 Long-Term Incentive Plan (the 2016 LTIP) permits grants of both incentive and non-qualified stock options principally at an option price per share equal to the grant date fair value of Chubb's Common Shares. Stock options are generally granted with a 3-year vesting period and a 10-year term. Stock options typically vest in equal annual installments over the vesting period, which is also the requisite service period. On February 22, 2018, Chubb granted 1,841,329 stock options with a weighted-average grant date fair value of $29.71 each. The fair value of the options issued is estimated on the grant date using the Black-Scholes option pricing model.

The 2016 LTIP also permits grants of service-based restricted stock and restricted stock units as well as performance-based restricted stock awards. Chubb generally grants service-based restricted stock and restricted stock units with a 4-year vesting period, based on a graded vesting schedule. Beginning in 2017, the performance-based stock awards granted comprise target awards which have 3-year cliff vesting provisions based on tangible book value (shareholders' equity less goodwill and intangible assets, net of tax) per share growth and P&C combined ratio compared to a defined group of peer companies. Premium performance-based stock awards are earned only if tangible book value per share growth and the P&C combined ratio over the cumulative 3-year period after the grant of the associated target awards exceed a higher threshold compared to our peer group, with an additional vesting provision based on total shareholder return compared to our peer group. The restricted stock is granted at market close price on the grant date. On February 22, 2018, Chubb granted 973,624 service-based restricted stock awards, 301,024 service-based restricted stock units, and 180,065 performance-based stock awards to employees and officers with a grant date fair value of $143.07 each. Each restricted stock unit represents our obligation to deliver to the holder one Common Share upon vesting.

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Shareholders' equity

3 Months Ended

Mar. 31, 2018

Stockholders' Equity Note [Abstract]

Shareholders' equity

Shareholders’ equity

All of Chubb’s Common Shares are authorized under Swiss corporate law. Though the par value of Common Shares is stated in Swiss francs, Chubb continues to use U.S. dollars as its reporting currency for preparing consolidated financial statements. Under Swiss corporate law, dividends, including distributions through a reduction in par value (par value reduction) or from legal reserves, must be stated in Swiss francs though dividend payments are made by Chubb in U.S. dollars. At March 31, 2018, our Common Shares had a par value of CHF 24.15 per share.

At our May 2017 and 2016 annual general meetings, our shareholders approved an annual dividend for the following year of up to $2.84 per share and $2.76 per share, respectively, which was paid in four quarterly installments of $0.71 per share and$0.69 per share, respectively, at dates determined by the Board of Directors (Board) after the annual general meetings by way of a distribution from capital contribution reserves, transferred to free reserves for payment.

Dividend distributions per Common Share for the three months ended March 31, 2018 and 2017 were $0.71 (CHF 0.66) and $0.69 (CHF 0.69), per Common Share, respectively.

Common Shares in treasury are used principally for issuance upon the exercise of employee stock options, grants of restricted stock, and purchases under the Employee Stock Purchase Plan (ESPP). At March 31, 2018, 13,952,378 Common Shares remain in treasury after net shares redeemed under employee share-based compensation plans.

Chubb Limited securities repurchase authorization

In November 2016, the Board authorized a share repurchase program of $1.0 billion of Chubb's Common Shares through December 31, 2017. In December 2017, the Board authorized a share repurchase program of $1.0 billion of Chubb's Common Shares from January 1, 2018 through December 31, 2018.

The following table presents repurchases of Chubb's Common Shares conducted in a series of open market transactions under the Board authorizations:

	Three Months Ended March 31
(in millions of U.S. dollars, except share data)	2018		2017
Number of shares repurchased	—		1,036,064
Cost of shares repurchased	$	—	$	140
Repurchase authorization remaining at end of period	$	1,000	$	860

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Postretirement benefits

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Compensation and Employee Benefit Plans [Text Block]

Postretirement benefits

The components of net pension and other postretirement benefit costs (benefits) reflected in Net income in the Consolidated statements of operations were as follows:

	Pension Benefits												Other Postretirement Benefits
	2018						2017						2018			2017
Three Months Ended March 31	U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans
(in millions of U.S. dollars)
Service cost	$	14		$	3		$	16		$	4		$	—		$	—
Interest cost	26			7			26			7			1			1
Expected return on plan assets	(53		)	(13		)	(47		)	(10		)	(1		)	(1		)
Amortization of prior service cost	—			—			—			—			(21		)	(23		)
Net periodic (benefit) cost	$	(13	)	$	(3	)	$	(5	)	$	1		$	(21	)	$	(23	)

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Segment information

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment information

Segment information

Chubb operates through six business segments: North America Commercial P&C Insurance, North America Personal P&C Insurance, North America Agricultural Insurance, Overseas General Insurance, Global Reinsurance, and Life Insurance.

Corporate results primarily include income and expenses not attributable to reportable segments and loss and loss expenses of asbestos and environmental (A&E) liabilities.

For segment reporting purposes, certain items are presented in a different manner below than in the consolidated financial statements. Management uses underwriting income (loss) as the main measures of segment performance. Chubb calculates underwriting income (loss) by subtracting Losses and loss expenses, Policy benefits, Policy acquisition costs, and Administrative expenses from Net premiums earned. To calculate Segment income, include Net investment income, Other (income) expense, and Amortization of purchased intangibles. For the North America Agricultural Insurance segment, management includes gains and losses on crop derivatives as a component of underwriting income (loss). For example, for the three months ended March 31, 2018, underwriting income in our North America Agricultural Insurance segment was $102 million. This amount includes $2 million of realized gains related to crop derivatives which are reported in Net realized gains (losses) in the Corporate column below.

For the Life Insurance segment, management includes Net investment income and (Gains) losses from fair value changes in separate account assets that do not qualify for separate account reporting under GAAP as components of Life Insurance underwriting income. For example, for the three months ended March 31, 2018, Life Insurance underwriting income of $67 million includes Net investment income of $83 million and gains from fair value changes in separate account assets of $6 million. The gains from fair value changes in separate account assets are reported in Other (income) expense in the table below.

The following tables present the Statement of Operations by segment:

	North America Commercial P&C Insurance			North America Personal P&C Insurance			North America Agricultural Insurance			Overseas General Insurance		Global Reinsurance			Life Insurance			Corporate			Chubb Consolidated
For the Three Months Ended
March 31, 2018
(in millions of U.S. dollars)
Net premiums written	$	2,812		$	1,048		$	108		$	2,384	$	193		$	559		$	—		$	7,104
Net premiums earned	3,029			1,140			43			2,107		168			540			—			7,027
Losses and loss expenses	1,908			886			(53		)	1,078		67			205			11			4,102
Policy benefits	—			—			—			—		—			151			—			151
Policy acquisition costs	472			237			(1		)	588		40			128			—			1,464
Administrative expenses	231			65			(3		)	239		10			78			72			692
Underwriting income (loss)	418			(48		)	100			202		51			(22		)	(83		)	618
Net investment income (loss)	503			59			7			151		64			83			(61		)	806
Other (income) expense	(6		)	—			—			7		(7		)	(4		)	(37		)	(47		)
Amortization expense of purchased intangibles	—			3			7			10		—			1			64			85
Segment income (loss)	$	927		$	8		$	100		$	336	$	122		$	64		$	(171	)	$	1,386
Net realized gains (losses) including OTTI																		(2		)	(2		)
Interest expense																		157			157
Chubb integration expenses																		10			10
Income tax expense																		135			135
Net income (loss)																		$	(475	)	$	1,082

	North America Commercial P&C Insurance (1)		North America Personal P&C Insurance		North America Agricultural Insurance			Overseas General Insurance (1)			Global Reinsurance		Life Insurance			Corporate			Chubb Consolidated
For the Three Months Ended
March 31, 2017
(in millions of U.S. dollars)
Net premiums written	$	2,730	$	984	$	61		$	2,212		$	199	$	524		$	—		$	6,710
Net premiums earned	3,041		1,086		14			1,936			189		506			—			6,772
Losses and loss expenses	1,860		633		(73		)	1,071			94		193			11			3,789
Policy benefits	—		—		—			—			—		168			—			168
Policy acquisition costs	487		217		(1		)	529			51		114			—			1,397
Administrative expenses	231		65		(5		)	245			10		72			58			676
Underwriting income (loss)	463		171		93			91			34		(41		)	(69		)	742
Net investment income (loss)	478		55		6			148			62		75			(79		)	745
Other (income) expense	4		1		—			(1		)	—		(29		)	(45		)	(70		)
Amortization expense of purchased intangibles	—		3		7			11			—		1			42			64
Segment income (loss)	$	937	$	222	$	92		$	229		$	96	$	62		$	(145	)	$	1,493
Net realized gains (losses) including OTTI																(7		)	(7		)
Interest expense																154			154
Chubb integration expenses																111			111
Income tax expense																128			128
Net income (loss)																$	(545	)	$	1,093

⁽¹⁾ The 2017 net premiums written amount was revised to reflect the transfer of certain multinational accounts ($12 million) from the North America Commercial P&C Insurance segment to the Overseas General Insurance segment to better align the reporting with the management of these businesses in 2018. There is no impact on a consolidated basis.

Underwriting assets are reviewed in total by management for purposes of decision-making. Other than Unpaid losses and loss expenses, Reinsurance recoverables, Goodwill and Other intangible assets, Chubb does not allocate assets to its segments.

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Earnings per share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings per share

Earnings per share

	Three Months Ended
	March 31
(in millions of U.S. dollars, except share and per share data)	2018		2017
Numerator:
Net income	$	1,082	$	1,093
Denominator:
Denominator for basic earnings per share:
Weighted-average shares outstanding	465,703,240		468,903,086
Denominator for diluted earnings per share:
Share-based compensation plans	3,770,351		3,828,604
Weighted-average shares outstanding and assumed conversions	469,473,591		472,731,690
Basic earnings per share	$	2.32	$	2.33
Diluted earnings per share	$	2.30	$	2.31
Potential anti-dilutive share conversions	2,116,188		969,654

Excluded from weighted-average shares outstanding and assumed conversions is the impact of securities that would have been anti-dilutive during the respective periods.

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Information provided in connection with outstanding debt of subsidiaries

3 Months Ended

Mar. 31, 2018

Disclosure Text Block Supplement [Abstract]

Information provided in connection with outstanding debt of subsidiaries

Information provided in connection with outstanding debt of subsidiaries

The following tables present condensed consolidating financial information at March 31, 2018 and December 31, 2017, and for the three months ended March 31, 2018 and 2017 for Chubb Limited (Parent Guarantor) and Chubb INA Holdings Inc. (Subsidiary Issuer). The Subsidiary Issuer is an indirect 100 percent-owned subsidiary of the Parent Guarantor. The Parent Guarantor fully and unconditionally guarantees certain of the debt of the Subsidiary Issuer. Condensed consolidating financial information of the Parent Guarantor and Subsidiary Issuer are presented on the equity method of accounting. The revenues and expenses and cash flows of the subsidiaries of the Subsidiary Issuer are presented in the Other Chubb Limited Subsidiaries column on a combined basis.

Condensed Consolidating Balance Sheet at March 31, 2018

(in millions of U.S. dollars)	Chubb Limited (Parent Guarantor)		Chubb INA Holdings Inc. (Subsidiary Issuer)		Other Chubb Limited Subsidiaries		Consolidating Adjustments and Eliminations			Chubb Limited Consolidated
Assets
Investments	$	—	$	186	$	101,919	$	—		$	102,105
Cash (1)	1		864		1,523		(400		)	1,988
Restricted cash	—		—		125		—			125
Insurance and reinsurance balances receivable	—		—		10,308		(738		)	9,570
Reinsurance recoverable on losses and loss expenses	—		—		26,093		(11,111		)	14,982
Reinsurance recoverable on policy benefits	—		—		1,181		(1,000		)	181
Value of business acquired	—		—		321		—			321
Goodwill and other intangible assets	—		—		22,123		—			22,123
Investments in subsidiaries	43,032		51,930		—		(94,962		)	—
Due from subsidiaries and affiliates, net	8,980		—		251		(9,231		)	—
Other assets	4		386		18,459		(1,463		)	17,386
Total assets	$	52,017	$	53,366	$	182,303	$	(118,905	)	$	168,781
Liabilities
Unpaid losses and loss expenses	$	—	$	—	$	74,299	$	(11,160	)	$	63,139
Unearned premiums	—		—		16,563		(1,068		)	15,495
Future policy benefits	—		—		6,412		(1,000		)	5,412
Due to subsidiaries and affiliates, net	—		9,231		—		(9,231		)	—
Affiliated notional cash pooling programs (1)	400		—		—		(400		)	—
Repurchase agreements	—		—		1,412		—			1,412
Short-term debt	—		1,669		—		—			1,669
Long-term debt	—		12,775		11		—			12,786
Trust preferred securities	—		308		—		—			308
Other liabilities	330		1,537		16,490		(1,084		)	17,273
Total liabilities	730		25,520		115,187		(23,943		)	117,494
Total shareholders’ equity	51,287		27,846		67,116		(94,962		)	51,287
Total liabilities and shareholders’ equity	$	52,017	$	53,366	$	182,303	$	(118,905	)	$	168,781

⁽¹⁾  Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2018, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

Condensed Consolidating Balance Sheet at December 31, 2017

(in millions of U.S. dollars)	Chubb Limited (Parent Guarantor)		Chubb INA Holdings Inc. (Subsidiary Issuer)		Other Chubb Limited Subsidiaries		Consolidating Adjustments and Eliminations			Chubb Limited Consolidated
Assets
Investments	$	—	$	168	$	102,276	$	—		$	102,444
Cash (1)	3		1		839		(115		)	728
Restricted cash	—		—		123		—			123
Insurance and reinsurance balances receivable	—		—		10,820		(1,486		)	9,334
Reinsurance recoverable on losses and loss expenses	—		—		27,514		(12,480		)	15,034
Reinsurance recoverable on policy benefits	—		—		1,194		(1,010		)	184
Value of business acquired	—		—		326		—			326
Goodwill and other intangible assets	—		—		22,054		—			22,054
Investments in subsidiaries	41,909		51,165		—		(93,074		)	—
Due from subsidiaries and affiliates, net	9,639		—		—		(9,639		)	—
Other assets	3		287		20,578		(4,073		)	16,795
Total assets	$	51,554	$	51,621	$	185,724	$	(121,877	)	$	167,022
Liabilities
Unpaid losses and loss expenses	$	—	$	—	$	74,767	$	(11,588	)	$	63,179
Unearned premiums	—		—		18,875		(3,659		)	15,216
Future policy benefits	—		—		6,331		(1,010		)	5,321
Due to subsidiaries and affiliates, net	—		9,432		207		(9,639		)	—
Affiliated notional cash pooling programs (1)	—		115		—		(115		)	—
Repurchase agreements	—		—		1,408		—			1,408
Short-term debt	—		1,013		—		—			1,013
Long-term debt	—		11,546		10		—			11,556
Trust preferred securities	—		308		—		—			308
Other liabilities	382		1,411		18,848		(2,792		)	17,849
Total liabilities	382		23,825		120,446		(28,803		)	115,850
Total shareholders’ equity	51,172		27,796		65,278		(93,074		)	51,172
Total liabilities and shareholders’ equity	$	51,554	$	51,621	$	185,724	$	(121,877	)	$	167,022

⁽¹⁾  Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2017, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

Condensed Consolidating Statements of Operations and Comprehensive Income

For the Three Months Ended March 31, 2018	Chubb Limited (Parent Guarantor)			Chubb INA Holdings Inc. (Subsidiary Issuer)			Other Chubb Limited Subsidiaries			Consolidating Adjustments and Eliminations			Chubb Limited Consolidated
(in millions of U.S. dollars)
Net premiums written	$	—		$	—		$	7,104		$	—		$	7,104
Net premiums earned	—			—			7,027			—			7,027
Net investment income	2			4			800			—			806
Equity in earnings of subsidiaries	1,022			885			—			(1,907		)	—
Net realized gains (losses) including OTTI	(2		)	(24		)	24			—			(2		)
Losses and loss expenses	—			—			4,102			—			4,102
Policy benefits	—			—			151			—			151
Policy acquisition costs and administrative expenses	18			22			2,116			—			2,156
Interest (income) expense	(80		)	209			28			—			157
Other (income) expense	(5		)	8			(50		)	—			(47		)
Amortization of purchased intangibles	—			—			85			—			85
Chubb integration expenses	2			1			7			—			10
Income tax expense (benefit)	5			(59		)	189			—			135
Net income	$	1,082		$	684		$	1,223		$	(1,907	)	$	1,082
Comprehensive income	$	453		$	216		$	614		$	(830	)	$	453

Condensed Consolidating Statements of Operations and Comprehensive Income

For the Three Months Ended March 31, 2017	Chubb Limited (Parent Guarantor)			Chubb INA Holdings Inc. (Subsidiary Issuer)			Other Chubb Limited Subsidiaries			Consolidating Adjustments and Eliminations			Chubb Limited Consolidated
(in millions of U.S. dollars)
Net premiums written	$	—		$	—		$	6,710		$	—		$	6,710
Net premiums earned	—			—			6,772			—			6,772
Net investment income	—			3			742			—			745
Equity in earnings of subsidiaries	1,027			701			—			(1,728		)	—
Net realized gains (losses) including OTTI	—			(13		)	6			—			(7		)
Losses and loss expenses	—			—			3,789			—			3,789
Policy benefits	—			—			168			—			168
Policy acquisition costs and administrative expenses	18			14			2,041			—			2,073
Interest (income) expense	(84		)	221			17			—			154
Other (income) expense	(6		)	15			(79		)	—			(70		)
Amortization of purchased intangibles	—			—			64			—			64
Chubb integration expenses	—			49			62			—			111
Income tax expense (benefit)	6			(112		)	234			—			128
Net income	$	1,093		$	504		$	1,224		$	(1,728	)	$	1,093
Comprehensive income	$	1,407		$	791		$	1,538		$	(2,329	)	$	1,407

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2018	Chubb Limited (Parent Guarantor)			Chubb INA Holdings Inc. (Subsidiary Issuer)			Other Chubb Limited Subsidiaries			Consolidating Adjustments and Eliminations			Chubb Limited Consolidated
(in millions of U.S. dollars)
Net cash flows from operating activities	$	24		$	2,727		$	800		$	(3,000	)	$	551
Cash flows from investing activities
Purchases of fixed maturities available for sale	—			(8		)	(5,964		)	—			(5,972		)
Purchases of fixed maturities held to maturity	—			—			(162		)	—			(162		)
Purchases of equity securities	—			—			(55		)	—			(55		)
Sales of fixed maturities available for sale	—			—			2,562			—			2,562
Sales of equity securities	—			—			40			—			40
Maturities and redemptions of fixed maturities available for sale	—			3			1,862			—			1,865
Maturities and redemptions of fixed maturities held to maturity	—			—			255			—			255
Net change in short-term investments	—			(14		)	745			—			731
Net derivative instruments settlements	—			(7		)	46			—			39
Private equity contributions	—			—			(353		)	—			(353		)
Private equity distributions	—			—			201			—			201
Capital contribution	(750		)	(3,500		)	—			4,250			—
Other	—			(3		)	(29		)	—			(32		)
Net cash flows used for investing activities	(750		)	(3,529		)	(852		)	4,250			(881		)
Cash flows from financing activities
Dividends paid on Common Shares	(330		)	—			—			—			(330		)
Common Shares repurchased	—			—			(29		)	—			(29		)
Proceeds from issuance of long-term debt	—			2,175			—			—			2,175
Repayment of long-term debt	—			(300		)	—			—			(300		)
Proceeds from issuance of repurchase agreements	—			—			408			—			408
Repayment of repurchase agreements	—			—			(404		)	—			(404		)
Proceeds from share-based compensation plans	—			—			34			—			34
Dividend to parent company	—			—			(3,000		)	3,000			—
Advances (to) from affiliates	656			(95		)	(561		)	—			—
Capital contribution	—			—			4,250			(4,250		)	—
Net proceeds from (payments to) affiliated notional cash pooling programs(1)	400			(115		)	—			(285		)	—
Policyholder contract deposits	—			—			118			—			118
Policyholder contract withdrawals	—			—			(105		)	—			(105		)
Net cash flows from financing activities	726			1,665			711			(1,535		)	1,567
Effect of foreign currency rate changes on cash and restricted cash	(2		)	—			27			—			25
Net increase (decrease) in cash and restricted cash	(2		)	863			686			(285		)	1,262
Cash and restricted cash – beginning of period(1)	3			1			962			(115		)	851
Cash and restricted cash – end of period(1)	$	1		$	864		$	1,648		$	(400	)	$	2,113

⁽¹⁾  Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2018 and December 31, 2017, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2017	Chubb Limited (Parent Guarantor)			Chubb INA Holdings Inc. (Subsidiary Issuer)			Other Chubb Limited Subsidiaries			Consolidating Adjustments and Eliminations			Chubb Limited Consolidated
(in millions of U.S. dollars)
Net cash flows from (used for) operating activities	$	584		$	(156	)	$	1,081		$	(496	)	$	1,013
Cash flows from investing activities
Purchases of fixed maturities available for sale	—			(4		)	(6,246		)	—			(6,250		)
Purchases of fixed maturities held to maturity	—			—			(157		)	—			(157		)
Purchases of equity securities	—			—			(37		)	—			(37		)
Sales of fixed maturities available for sale	—			—			3,395			—			3,395
Sales of equity securities	—			—			46			—			46
Maturities and redemptions of fixed maturities    available for sale	—			7			2,536			—			2,543
Maturities and redemptions of fixed maturities held to maturity	—			—			240			—			240
Net change in short-term investments	—			173			59			—			232
Net derivative instruments settlements	—			(2		)	(87		)	—			(89		)
Private equity contributions	—			—			(198		)	—			(198		)
Private equity distributions	—			—			315			—			315
Other	—			—			(106		)	—			(106		)
Net cash flows from (used for) investing activities	—			174			(240		)	—			(66		)
Cash flows from financing activities
Dividends paid on Common Shares	(324		)	—			—			—			(324		)
Common Shares repurchased	—			—			(128		)	—			(128		)
Proceeds from issuance of repurchase agreements	—			—			753			—			753
Repayment of long-term debt	—			(500		)	—			—			(500		)
Repayment of repurchase agreements	—			—			(752		)	—			(752		)
Proceeds from share-based compensation plans	—			—			42			—			42
Dividend to parent company	—			—			(496		)	496			—
Advances (to) from affiliates	108			(171		)	63			—			—
Net proceeds from (payments to) affiliated notional cash pooling programs(1)	(363		)	653			—			(290		)	—
Policyholder contract deposits	—			—			109			—			109
Policyholder contract withdrawals	—			—			(58		)	—			(58		)
Net cash flows used for financing activities	(579		)	(18		)	(467		)	206			(858		)
Effect of foreign currency rate changes on cash and restricted cash	—			—			(17		)	—			(17		)
Net increase in cash and restricted cash	5			—			357			(290		)	72
Cash and restricted cash – beginning of period(1)	1			1			2,068			(982		)	1,088
Cash and restricted cash – end of period(1)	$	6		$	1		$	2,425		$	(1,272	)	$	1,160

⁽¹⁾  Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2017 and December 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

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General (Policies)

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of presentation

a) Basis of presentation

Chubb Limited is a holding company incorporated in Zurich, Switzerland. Chubb Limited, through its subsidiaries, provides a broad range of insurance and reinsurance products to insureds worldwide. Chubb operates through the following business segments: North America Commercial P&C Insurance, North America Personal P&C Insurance, North America Agricultural Insurance, Overseas General Insurance, Global Reinsurance, and Life Insurance. Refer to Note 10 for additional information.

The interim unaudited consolidated financial statements, which include the accounts of Chubb Limited and its subsidiaries (collectively, Chubb, we, us, or our), have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) and, in the opinion of management, reflect all adjustments (consisting of normally recurring accruals) necessary for a fair statement of the results and financial position for such periods. All significant intercompany accounts and transactions, including internal reinsurance transactions, have been eliminated.

The results of operations and cash flows for any interim period are not necessarily indicative of the results for the full year. These consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in our 2017 Form 10-K.

Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]

b) Restricted cash

Effective January 1, 2018, we retrospectively adopted guidance on "Restricted Cash" that clarified the presentation of restricted cash on the consolidated statement of cash flows. As a result, we revised the statement of cash flows for the three months ended March 31, 2017 to include restricted cash in the beginning and ending cash balances. In addition, we reclassified $123 million of Restricted cash from Other assets to a separate line in the balance sheet as of December 31, 2017.

Restricted cash in the consolidated balance sheets represents amounts held for the benefit of third parties and is legally or contractually restricted as to withdrawal or usage. Amounts include deposits with U.S. and non-U.S. regulatory authorities, trust funds set up for the benefit of ceding companies, and amounts pledged as collateral to meet financing arrangements.

The following table provides a reconciliation of cash and restricted cash reported within the consolidated balance sheets that total to the amounts shown in the consolidated statements of cash flows:

	March 31		December 31
(in millions of U.S. dollars)	2018		2017
Cash	$	1,988	$	728
Restricted cash	125		123
Total cash and restricted cash shown in the consolidated statements of cash flows	$	2,113	$	851

Goodwill, Policy [Policy Text Block]

c) Goodwill

During the three months ended March 31, 2018, Goodwill increased $145 million, primarily reflecting the impact of foreign exchange.

Accounting guidance adopted in 2018

d) Accounting guidance adopted in 2018

Revenue from Contracts with Customers

In May 2014, the FASB issued an accounting standard that supersedes most existing revenue recognition guidance. The standard excludes from its scope the accounting for insurance contracts, leases, financial instruments, and certain other agreements that are governed under other GAAP guidance, but could affect the revenue recognition for certain of our claims management and risk control services. The updated guidance requires an entity to recognize revenue as performance obligations are met, in order to reflect the transfer of promised goods or services to customers in an amount that reflects the consideration the entity is entitled to receive for those goods or services. This guidance was effective for us on January 1, 2018. The adoption of this guidance did not have a material impact on our financial condition or results of operations given that the majority of our business is outside the scope of this guidance.

Financial Instruments – Recognition and Measurement of Financial Assets and Financial Liabilities

Effective January 2018, we adopted new accounting guidance on "Recognition and Measurement of Financial Assets and Financial Liabilities" on a modified-retrospective basis. The guidance requires equity investments, other than those accounted for under the equity method of accounting, to be measured at fair value with changes in fair value recognized through net income. The guidance impacts our public equities and cost-method private equities. As a result, we recorded a cumulative-effect adjustment to increase beginning Retained earnings by $416 million after tax ($454 million pre-tax), representing the unrealized appreciation on our equity investments with an offsetting adjustment to decrease Accumulated other comprehensive income. All subsequent changes in fair value of our equity investments are recognized within realized gains (losses) on the consolidated statement of operations. Prior period amounts have not been adjusted and continue to be reported in accordance with the previous accounting guidance.

Income Taxes

Effective January 2018, we adopted new accounting guidance on “Intra-Entity Transfers of Assets Other Than Inventory” on a modified-retrospective basis. Under the new guidance, we will no longer defer taxes on intra-company asset transfers and will recognize income tax expense (benefit) immediately through the income statement. As a result, we recorded a cumulative-effect adjustment to decrease beginning Retained earnings by $7 million representing the removal of the deferred tax asset for previous intra-company asset transfer transactions not yet recognized through earnings.

Income Tax Accounting Implications of the Tax Cuts and Jobs Act

The Tax Cuts and Jobs Act (2017 Tax Act) was signed into legislation in December 2017. The Securities and Exchange Commission issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act, which provides guidance for the application of the 2017 Tax Act. The income tax guidance allows for the transition impact of the 2017 Tax Act to be recorded as 1) complete with all accounting implications identified, 2) provisional based on a reasonable estimate, or 3) not recorded as no reasonable estimate was determinable.

In December 2017, we recorded a $450 million income tax transition benefit on a provisional basis under SAB 118. There were no changes to this estimate for the current period as we continue to analyze the impact of the 2017 Tax Act.

Accounting guidance not yet adopted

Refer to the2017 Form 10-K for information on other accounting guidance not yet adopted.

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General General (Tables)

3 Months Ended

Mar. 31, 2018

Cash and Cash Equivalents [Abstract]

Schedule of Cash and Cash Equivalents [Table Text Block]

The following table provides a reconciliation of cash and restricted cash reported within the consolidated balance sheets that total to the amounts shown in the consolidated statements of cash flows:

	March 31		December 31
(in millions of U.S. dollars)	2018		2017
Cash	$	1,988	$	728
Restricted cash	125		123
Total cash and restricted cash shown in the consolidated statements of cash flows	$	2,113	$	851

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Investments (Tables)

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule Of Amortized Cost And Fair Value Of HTM Fixed Maturities And Related OTTI Recognized In AOCI

March 31, 2018	Amortized Cost		Gross Unrealized Appreciation		Gross Unrealized Depreciation			Fair Value		OTTI Recognized in AOCI
(in millions of U.S. dollars)
Available for sale
U.S. Treasury and agency	$	3,893	$	22	$	(77	)	$	3,838	$	—
Foreign	21,705		513		(187		)	22,031		—
Corporate securities	23,509		332		(274		)	23,567		(4		)
Mortgage-backed securities	16,116		53		(349		)	15,820		(1		)
States, municipalities, and political subdivisions	13,985		61		(191		)	13,855		—
	$	79,208	$	981	$	(1,078	)	$	79,111	$	(5	)
Held to maturity
U.S. Treasury and agency	$	1,037	$	9	$	(14	)	$	1,032	$	—
Foreign	1,754		17		(20		)	1,751		—
Corporate securities	3,026		26		(55		)	2,997		—
Mortgage-backed securities	2,681		11		(45		)	2,647		—
States, municipalities, and political subdivisions	5,755		18		(78		)	5,695		—
	$	14,253	$	81	$	(212	)	$	14,122	$	—

December 31, 2017	Amortized Cost		Gross Unrealized Appreciation		Gross Unrealized Depreciation			Fair Value		OTTI Recognized in AOCI
(in millions of U.S. dollars)
Available for sale
U.S. Treasury and agency	$	3,701	$	32	$	(35	)	$	3,698	$	—
Foreign	20,514		622		(106		)	21,030		(1		)
Corporate securities	23,453		638		(95		)	23,996		(4		)
Mortgage-backed securities	15,279		111		(100		)	15,290		(1		)
States, municipalities, and political subdivisions	14,888		125		(88		)	14,925		—
	$	77,835	$	1,528	$	(424	)	$	78,939	$	(6	)
Held to maturity
U.S. Treasury and agency	$	908	$	12	$	(5	)	$	915	$	—
Foreign	1,738		27		(8		)	1,757		—
Corporate securities	3,159		67		(7		)	3,219		—
Mortgage-backed securities	2,724		23		(5		)	2,742		—
States, municipalities, and political subdivisions	5,806		50		(15		)	5,841		—
	$	14,335	$	179	$	(40	)	$	14,474	$	—

Schedule Of Amortized Cost and Fair Value of Available-for-sale Securities and Related OTTI Recognized in AOCI

March 31, 2018	Amortized Cost		Gross Unrealized Appreciation		Gross Unrealized Depreciation			Fair Value		OTTI Recognized in AOCI
(in millions of U.S. dollars)
Available for sale
U.S. Treasury and agency	$	3,893	$	22	$	(77	)	$	3,838	$	—
Foreign	21,705		513		(187		)	22,031		—
Corporate securities	23,509		332		(274		)	23,567		(4		)
Mortgage-backed securities	16,116		53		(349		)	15,820		(1		)
States, municipalities, and political subdivisions	13,985		61		(191		)	13,855		—
	$	79,208	$	981	$	(1,078	)	$	79,111	$	(5	)
Held to maturity
U.S. Treasury and agency	$	1,037	$	9	$	(14	)	$	1,032	$	—
Foreign	1,754		17		(20		)	1,751		—
Corporate securities	3,026		26		(55		)	2,997		—
Mortgage-backed securities	2,681		11		(45		)	2,647		—
States, municipalities, and political subdivisions	5,755		18		(78		)	5,695		—
	$	14,253	$	81	$	(212	)	$	14,122	$	—

December 31, 2017	Amortized Cost		Gross Unrealized Appreciation		Gross Unrealized Depreciation			Fair Value		OTTI Recognized in AOCI
(in millions of U.S. dollars)
Available for sale
U.S. Treasury and agency	$	3,701	$	32	$	(35	)	$	3,698	$	—
Foreign	20,514		622		(106		)	21,030		(1		)
Corporate securities	23,453		638		(95		)	23,996		(4		)
Mortgage-backed securities	15,279		111		(100		)	15,290		(1		)
States, municipalities, and political subdivisions	14,888		125		(88		)	14,925		—
	$	77,835	$	1,528	$	(424	)	$	78,939	$	(6	)
Held to maturity
U.S. Treasury and agency	$	908	$	12	$	(5	)	$	915	$	—
Foreign	1,738		27		(8		)	1,757		—
Corporate securities	3,159		67		(7		)	3,219		—
Mortgage-backed securities	2,724		23		(5		)	2,742		—
States, municipalities, and political subdivisions	5,806		50		(15		)	5,841		—
	$	14,335	$	179	$	(40	)	$	14,474	$	—

Schedule Of Fixed Maturities By Contractual Maturity

The following table presents fixed maturities by contractual maturity:

			March 31				December 31
			2018				2017
(in millions of U.S. dollars)	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Available for sale
Due in 1 year or less	$	3,735	$	3,746	$	3,164	$	3,182
Due after 1 year through 5 years	25,140		25,251		24,749		25,068
Due after 5 years through 10 years	25,243		25,097		25,388		25,704
Due after 10 years	8,974		9,197		9,255		9,695
	63,092		63,291		62,556		63,649
Mortgage-backed securities	16,116		15,820		15,279		15,290
	$	79,208	$	79,111	$	77,835	$	78,939
Held to maturity
Due in 1 year or less	$	838	$	840	$	743	$	746
Due after 1 year through 5 years	2,684		2,678		2,669		2,688
Due after 5 years through 10 years	4,713		4,635		4,744		4,756
Due after 10 years	3,337		3,322		3,455		3,542
	11,572		11,475		11,611		11,732
Mortgage-backed securities	2,681		2,647		2,724		2,742
	$	14,253	$	14,122	$	14,335	$	14,474

Schedule of Realized Gain (Loss)

The following table presents the components of Net realized gains (losses):

	Three Months Ended
	March 31
(in millions of U.S. dollars)	2018			2017
Fixed maturities:
OTTI on fixed maturities, gross	$	(1	)	$	(6	)
OTTI on fixed maturities recognized in OCI (pre-tax)	—			—
OTTI on fixed maturities, net	(1		)	(6		)
Gross realized gains excluding OTTI	66			34
Gross realized losses excluding OTTI	(88		)	(40		)
Total fixed maturities	(23		)	(12		)
Equity securities:
OTTI on equity securities	—			(5		)
Gross realized gains excluding OTTI	10			9
Gross realized losses excluding OTTI	(21		)	—
Total equity securities	(11		)	4
OTTI on other investments	—			(8		)
Other investments	29			—
Foreign exchange losses	(77		)	(19		)
Investment and embedded derivative instruments	17			6
Fair value adjustments on insurance derivative	38			93
S&P put options and futures	22			(74		)
Other derivative instruments	2			2
Other	1			1
Net realized gains (losses)	$	(2	)	$	(7	)

Schedule Of Roll-Forward Of Pre-Tax Credit Losses Related To Fixed Maturities For Which A Portion Of OTTI Was Recognized In OCI

The following table presents a roll-forward of pre-tax credit losses related to fixed maturities for which a portion of OTTI was recognized in OCI:

	Three Months Ended
	March 31
(in millions of U.S. dollars)	2018			2017
Balance of credit losses related to securities still held – beginning of period	$	22		$	35
Additions where no OTTI was previously recorded	—			—
Additions where an OTTI was previously recorded	—			1
Reductions for securities sold during the period	(7		)	(4		)
Balance of credit losses related to securities still held – end of period	$	15		$	32

Gain (Loss) on Investments [Table Text Block]

Effective January 1, 2018, we adopted new accounting guidance that requires any changes in fair value of equity securities and other investments that are accounted for under the cost-method to be recognized immediately in realized gains and losses in net income. As a result, beginning on January 1, 2018, realized gains and losses from these investments include both sales of securities and unrealized gains and losses as follows:

	Three Months Ended
	March 31, 2018
(in millions of U.S. dollars)	Equity Securities			Other Investments
Net gains (losses) recognized during the period	$	(11	)	$	29
Less: Net gains (losses) recognized from sales of securities	10			—
Unrealized gains (losses) recognized for securities still held at reporting date	$	(21	)	$	29

Schedule Of Aggregate Fair Value And Gross Unrealized Loss By Length Of Time The Security Has Continuously Been In An Unrealized Loss Position

The following tables present, for all securities in an unrealized loss position (including securities on loan), the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position:

	0 – 12 Months					Over 12 Months					Total
March 31, 2018	Fair Value		Gross Unrealized Loss			Fair Value		Gross Unrealized Loss			Fair Value		Gross Unrealized Loss
(in millions of U.S. dollars)
U.S. Treasury and agency	$	2,869	$	(55	)	$	1,314	$	(36	)	$	4,183	$	(91	)
Foreign	8,715		(155		)	1,643		(52		)	10,358		(207		)
Corporate securities	12,355		(260		)	1,501		(69		)	13,856		(329		)
Mortgage-backed securities	12,313		(257		)	3,033		(137		)	15,346		(394		)
States, municipalities, and political subdivisions	15,030		(218		)	1,343		(51		)	16,373		(269		)
Total fixed maturities	$	51,282	$	(945	)	$	8,834	$	(345	)	$	60,116	$	(1,290	)

	0 – 12 Months					Over 12 Months					Total
December 31, 2017	Fair Value		Gross Unrealized Loss			Fair Value		Gross Unrealized Loss			Fair Value		Gross Unrealized Loss
(in millions of U.S. dollars)
U.S. Treasury and agency	$	2,172	$	(14	)	$	1,249	$	(26	)	$	3,421	$	(40	)
Foreign	5,657		(65		)	1,693		(49		)	7,350		(114		)
Corporate securities	5,210		(56		)	1,332		(46		)	6,542		(102		)
Mortgage-backed securities	6,194		(31		)	3,209		(74		)	9,403		(105		)
States, municipalities, and political subdivisions	9,259		(71		)	1,402		(32		)	10,661		(103		)
Total fixed maturities	28,492		(237		)	8,885		(227		)	37,377		(464		)
Equity securities	115		(12		)	—		—			115		(12		)
Other investments	78		(8		)	—		—			78		(8		)
Total	$	28,685	$	(257	)	$	8,885	$	(227	)	$	37,570	$	(484	)

Schedule Of Components Of Restricted Assets

The following table presents the components of restricted assets:

	March 31		December 31
(in millions of U.S. dollars)	2018		2017
Trust funds	$	17,029	$	17,011
Deposits with U.S. regulatory authorities	2,463		2,345
Deposits with non-U.S. regulatory authorities	2,290		2,250
Assets pledged under repurchase agreements	1,460		1,434
Other pledged assets	433		414
	$	23,675	$	23,454

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Fair value measurements (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Financial Instruments Measured At Fair Value On A Recurring Basis

Financial instruments measured at fair value on a recurring basis, by valuation hierarchy

March 31, 2018	Level 1		Level 2		Level 3		Total
(in millions of U.S. dollars)
Assets:
Fixed maturities available for sale
U.S. Treasury and agency	$	3,094	$	744	$	—	$	3,838
Foreign	—		21,855		176		22,031
Corporate securities	—		22,494		1,073		23,567
Mortgage-backed securities	—		15,737		83		15,820
States, municipalities, and political subdivisions	—		13,855		—		13,855
	3,094		74,685		1,332		79,111
Equity securities	884		—		64		948
Short-term investments	1,735		1,127		12		2,874
Other investments (1)	451		318		270		1,039
Securities lending collateral	—		2,039		—		2,039
Investment derivative instruments	25		—		—		25
Other derivative instruments	78		—		—		78
Separate account assets	2,774		100		—		2,874
Total assets measured at fair value (1)	$	9,041	$	78,269	$	1,678	$	88,988
Liabilities:
Investment derivative instruments	$	29	$	—	$	—	$	29
Other derivative instruments	—		—		2		2
GLB (2)	—		—		167		167
Total liabilities measured at fair value	$	29	$	—	$	169	$	198

⁽¹⁾  Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $3,866 million and other investments of $14 million at March 31, 2018 measured using NAV as a practical expedient.

⁽²⁾  Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets.

December 31, 2017	Level 1		Level 2		Level 3		Total
(in millions of U.S. dollars)
Assets:
Fixed maturities available for sale
U.S. Treasury and agency	$	3,129	$	569	$	—	$	3,698
Foreign	—		20,937		93		21,030
Corporate securities	—		22,959		1,037		23,996
Mortgage-backed securities	—		15,212		78		15,290
States, municipalities, and political subdivisions	—		14,925		—		14,925
	3,129		74,602		1,208		78,939
Equity securities	893		—		44		937
Short-term investments	2,309		1,252		—		3,561
Other investments (1)	466		305		263		1,034
Securities lending collateral	—		1,737		—		1,737
Investment derivative instruments	18		—		—		18
Other derivative instruments	1		—		—		1
Separate account assets	2,635		99		—		2,734
Total assets measured at fair value (1)	$	9,451	$	77,995	$	1,515	$	88,961
Liabilities:
Investment derivative instruments	$	30	$	—	$	—	$	30
Other derivative instruments	21		—		2		23
GLB (2)	—		—		204		204
Total liabilities measured at fair value	$	51	$	—	$	206	$	257

⁽¹⁾  Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $3,623 million and other investments of $15 million at December 31, 2017 measured using NAV as a practical expedient.

⁽²⁾  Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets.

Fair Value And Maximum Future Funding Commitments Related To Investments

The following table presents, by investment category, the expected liquidation period, fair value, and maximum future funding commitments of alternative investments:

				March 31				December 31
	Expected Liquidation Period of Underlying Assets			2018				2017
(in millions of U.S. dollars)		Fair Value		Maximum Future Funding Commitments		Fair Value		Maximum Future Funding Commitments
Financial	5 to 9 Years	$	538	$	327	$	540	$	330
Real Assets	3 to 7 Years	656		210		651		114
Distressed	3 to 7 Years	295		131		289		141
Private Credit	3 to 7 Years	173		320		187		327
Traditional	3 to 15 Years	1,901		2,858		1,656		3,149
Vintage	1 to 2 Years	27		—		30		—
Investment funds	Not Applicable	276		—		270		—
		$	3,866	$	3,846	$	3,623	$	4,061

Schedule Of Significant Unobservable Inputs Used In Level 3 Liability Valuations

The following table presents the significant unobservable inputs used in the Level 3 liability valuations. Excluded from the table below are inputs used to determine the fair value of Level 3 assets which are based on single broker quotes and contain no quantitative unobservable inputs developed by management.

(in millions of U.S. dollars, except for percentages)	Fair Value				Valuation Technique	Significant Unobservable Inputs	Ranges
	March 31, 2018		December 31, 2017
GLB (1)	$	167	$	204	Actuarial model	Lapse rate	3% – 33%
						Annuitization rate	0% – 100%

⁽¹⁾  Discussion of the most significant inputs used in the fair value measurement of GLB and the sensitivity of those assumptions is included within Note 3 a) Guaranteed living benefits.

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

The following tables present a reconciliation of the beginning and ending balances of financial instruments measured at fair value using significant unobservable inputs (Level 3):

	Assets																Liabilities
Three Months Ended	Available-for-Sale Debt Securities								Equity securities		Short-term investments			Other investments			Other derivative instruments		GLB (2)
March 31, 2018	Foreign			Corporate securities (1)			MBS
(in millions of U.S. dollars)
Balance – beginning of period	$	93		$	1,037		$	78	$	44	$	—		$	263		$	2	$	204
Transfers into Level 3	7			—			1		—		5			—			—		—
Transfers out of Level 3	—			(10		)	—		—		—			—			—		—
Change in Net Unrealized Gains (Losses) included in OCI, including Foreign Exchange	9			(3		)	—		1		—			2			—		—
Net Realized Gains/Losses	—			—			—		2		—			—			—		(37		)
Purchases	87			139			4		17		8			14			—		—
Sales	(19		)	(51		)	—		—		—			—			—		—
Settlements	(1		)	(39		)	—		—		(1		)	(9		)	—		—
Balance – end of period	$	176		$	1,073		$	83	$	64	$	12		$	270		$	2	$	167
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date	$	—		$	—		$	—	$	—	$	—		$	—		$	—	$	(37	)

⁽¹⁾  Purchases in Level 3 primarily consist of privately-placed fixed income securities.

⁽²⁾  Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $529 million at March 31, 2018, and $550 million at December 31, 2017, which includes a fair value derivative adjustment of $167 million and $204 million, respectively.

	Assets																				Liabilities
Three Months Ended	Available-for-Sale Debt Securities									Equity securities		Short-term investments			Other investments			Other derivative instruments			GLB (1)
March 31, 2017	Foreign			Corporate securities			MBS
(in millions of U.S. dollars)
Balance – beginning of period	$	74		$	681		$	45		$	41	$	25		$	225		$	13		$	559
Transfers into Level 3	—			29			—			—		—			—			—			—
Transfers out of Level 3	—			(54		)	—			—		—			—			—			—
Change in Net Unrealized Gains (Losses) included in OCI	(1		)	(8		)	—			—		—			4			—			—
Net Realized Gains/Losses	(1		)	(1		)	—			—		—			—			(2		)	(93		)
Purchases	14			156			1			—		7			8			—			—
Sales	(3		)	(27		)	(1		)	—		—			—			—			—
Settlements	(3		)	(39		)	—			—		(11		)	(4		)	—			—
Balance – end of period	$	80		$	737		$	45		$	41	$	21		$	233		$	11		$	466
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date	$	—		$	—		$	—		$	—	$	—		$	—		$	(2	)	$	(93	)

⁽¹⁾  Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $774 million at March 31, 2017, and $853 million at December 31, 2016, which includes a fair value derivative adjustment of $466 million and $559 million, respectively.

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

The following tables present a reconciliation of the beginning and ending balances of financial instruments measured at fair value using significant unobservable inputs (Level 3):

	Assets																Liabilities
Three Months Ended	Available-for-Sale Debt Securities								Equity securities		Short-term investments			Other investments			Other derivative instruments		GLB (2)
March 31, 2018	Foreign			Corporate securities (1)			MBS
(in millions of U.S. dollars)
Balance – beginning of period	$	93		$	1,037		$	78	$	44	$	—		$	263		$	2	$	204
Transfers into Level 3	7			—			1		—		5			—			—		—
Transfers out of Level 3	—			(10		)	—		—		—			—			—		—
Change in Net Unrealized Gains (Losses) included in OCI, including Foreign Exchange	9			(3		)	—		1		—			2			—		—
Net Realized Gains/Losses	—			—			—		2		—			—			—		(37		)
Purchases	87			139			4		17		8			14			—		—
Sales	(19		)	(51		)	—		—		—			—			—		—
Settlements	(1		)	(39		)	—		—		(1		)	(9		)	—		—
Balance – end of period	$	176		$	1,073		$	83	$	64	$	12		$	270		$	2	$	167
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date	$	—		$	—		$	—	$	—	$	—		$	—		$	—	$	(37	)

⁽¹⁾  Purchases in Level 3 primarily consist of privately-placed fixed income securities.

⁽²⁾  Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $529 million at March 31, 2018, and $550 million at December 31, 2017, which includes a fair value derivative adjustment of $167 million and $204 million, respectively.

	Assets																				Liabilities
Three Months Ended	Available-for-Sale Debt Securities									Equity securities		Short-term investments			Other investments			Other derivative instruments			GLB (1)
March 31, 2017	Foreign			Corporate securities			MBS
(in millions of U.S. dollars)
Balance – beginning of period	$	74		$	681		$	45		$	41	$	25		$	225		$	13		$	559
Transfers into Level 3	—			29			—			—		—			—			—			—
Transfers out of Level 3	—			(54		)	—			—		—			—			—			—
Change in Net Unrealized Gains (Losses) included in OCI	(1		)	(8		)	—			—		—			4			—			—
Net Realized Gains/Losses	(1		)	(1		)	—			—		—			—			(2		)	(93		)
Purchases	14			156			1			—		7			8			—			—
Sales	(3		)	(27		)	(1		)	—		—			—			—			—
Settlements	(3		)	(39		)	—			—		(11		)	(4		)	—			—
Balance – end of period	$	80		$	737		$	45		$	41	$	21		$	233		$	11		$	466
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date	$	—		$	—		$	—		$	—	$	—		$	—		$	(2	)	$	(93	)

⁽¹⁾  Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $774 million at March 31, 2017, and $853 million at December 31, 2016, which includes a fair value derivative adjustment of $466 million and $559 million, respectively.

Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value

The following tables present fair value, by valuation hierarchy, and carrying value of the financial instruments not measured at fair value:

March 31, 2018	Fair Value								Carrying Value
(in millions of U.S. dollars)	Level 1		Level 2		Level 3		Total
Assets:
Fixed maturities held to maturity
U.S. Treasury and agency	$	977	$	55	$	—	$	1,032	$	1,037
Foreign	—		1,751		—		1,751		1,754
Corporate securities	—		2,964		33		2,997		3,026
Mortgage-backed securities	—		2,647		—		2,647		2,681
States, municipalities, and political subdivisions	—		5,695		—		5,695		5,755
Total assets	$	977	$	13,112	$	33	$	14,122	$	14,253
Liabilities:
Repurchase agreements	$	—	$	1,412	$	—	$	1,412	$	1,412
Short-term debt	—		1,704		—		1,704		1,669
Long-term debt	—		13,023		—		13,023		12,786
Trust preferred securities	—		466		—		466		308
Total liabilities	$	—	$	16,605	$	—	$	16,605	$	16,175

December 31, 2017	Fair Value								Carrying Value
(in millions of U.S. dollars)	Level 1		Level 2		Level 3		Total
Assets:
Fixed maturities held to maturity
U.S. Treasury and agency	$	857	$	58	$	—	$	915	$	908
Foreign	—		1,757		—		1,757		1,738
Corporate securities	—		3,184		35		3,219		3,159
Mortgage-backed securities	—		2,742		—		2,742		2,724
States, municipalities, and political subdivisions	—		5,841		—		5,841		5,806
Total assets	$	857	$	13,582	$	35	$	14,474	$	14,335
Liabilities:
Repurchase agreements	$	—	$	1,408	$	—	$	1,408	$	1,408
Short-term debt	—		1,013		—		1,013		1,013
Long-term debt	—		12,332		—		12,332		11,556
Trust preferred securities	—		468		—		468		308
Total liabilities	$	—	$	15,221	$	—	$	15,221	$	14,285

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Unpaid losses and loss expenses Unpaid losses and loss expenses (Tables)

3 Months Ended

Mar. 31, 2018

Liability for Claims and Claims Adjustment Expense [Abstract]

Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]

The following table presents a reconciliation of beginning and ending Unpaid losses and loss expenses:

	Three Months Ended March 31
(in millions of U.S. dollars)	2018			2017
Gross unpaid losses and loss expenses – beginning of period	$	63,179		$	60,540
Reinsurance recoverable on unpaid losses - beginning of period (1)	(14,014		)	(12,708		)
Net unpaid losses and loss expenses – beginning of period	49,165			47,832
Net losses and loss expenses incurred in respect of losses occurring in:
Current year	4,358			4,078
Prior years (2)	(256		)	(289		)
Total	4,102			3,789
Net losses and loss expenses paid in respect of losses occurring in:
Current year	809			798
Prior years	3,433			3,109
Total	4,242			3,907
Foreign currency revaluation and other	292			54
Net unpaid losses and loss expenses – end of period	49,317			47,768
Reinsurance recoverable on unpaid losses (3)	13,822			12,811
Gross unpaid losses and loss expenses – end of period	$	63,139		$	60,579

⁽¹⁾  Net of provision for uncollectible reinsurance of $321 million and $300 million at December 31, 2017 and 2016, respectively.

⁽²⁾  Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments, and earned premiums totaling $47 million and $58 million for the three months ended March 31, 2018 and 2017, respectively.

⁽³⁾  Net of provision for uncollectible reinsurance of $320 million and $334 million at March 31, 2018 and 2017, respectively.

Prior Period Development, by Segment [Table Text Block]

	Three Months Ended March 31
(in millions of U.S. dollars)	Long-tail			Short-tail			Total
2018
North America Commercial P&C Insurance	$	8		$	(109	)	$	(101	)
North America Personal P&C Insurance	—			(6		)	(6		)
North America Agricultural Insurance	—			(76		)	(76		)
Overseas General Insurance	—			(22		)	(22		)
Global Reinsurance	—			(14		)	(14		)
Corporate	10			—			10
Total	$	18		$	(227	)	$	(209	)
2017
North America Commercial P&C Insurance	$	(94	)	$	(85	)	$	(179	)
North America Personal P&C Insurance	—			(3		)	(3		)
North America Agricultural Insurance	—			(79		)	(79		)
Overseas General Insurance	32			(20		)	12
Global Reinsurance	8			—			8
Corporate	10			—			10
Total	$	(44	)	$	(187	)	$	(231	)

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Commitments, contingencies, and guarantees (Tables)

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Balance Sheet Locations, Fair Values In An Asset Or (Liability) Position, And Notional Values/Payment Provisions Of Derivative Instruments

The following table presents the balance sheet locations, fair values of derivative instruments in an asset or (liability) position, and notional values/payment provisions of our derivative instruments:

				March 31, 2018							December 31, 2017
	Consolidated Balance Sheet Location	Fair Value					Notional Value/ Payment Provision		Fair Value					Notional Value/ Payment Provision
(in millions of U.S. dollars)		Derivative Asset		Derivative (Liability)					Derivative Asset		Derivative (Liability)
Investment and embedded derivative instruments:
Foreign currency forward contracts	OA / (AP)	$	19	$	(17	)	$	2,125	$	14	$	(27	)	$	2,064
Cross-currency swaps	OA / (AP)	—		—			45		—		—			45
Options/Futures contracts on notes and bonds	OA / (AP)	6		(12		)	1,093		4		(3		)	1,007
Convertible securities (1)	FM AFS / ES	7		—			8		5		—			6
		$	32	$	(29	)	$	3,271	$	23	$	(30	)	$	3,122
Other derivative instruments:
Futures contracts on equities(2)	OA / (AP)	$	71	$	—		$	1,625	$	—	$	(21	)	$	1,553
Other	OA / (AP)	7		(2		)	326		1		(2		)	75
		$	78	$	(2	)	$	1,951	$	1	$	(23	)	$	1,628
GLB (3)	(AP) / (FPB)	$	—	$	(529	)	$	1,175	$	—	$	(550	)	$	1,083

⁽¹⁾  Includes fair value of embedded derivatives.

⁽²⁾  Related to GMDB and GLB blocks of business.

⁽³⁾  Includes both future policy benefits reserves and fair value derivative adjustment. Note that the payment provision related to GLB is the net amount at risk. The concept of a notional value does not apply to the GLB reinsurance contracts.

Transfer of Certain Financial Assets Accounted for as Secured Borrowings

The following table presents the carrying value of collateral held under securities lending agreements by investment category and remaining contractual maturity of the underlying agreements:

	Remaining contractual maturity
	March 31		December 31
	2018		2017
(in millions of U.S. dollars)	Overnight and Continuous
Collateral held under securities lending agreements:
Cash	$	826	$	828
U.S. Treasury and agency	40		36
Foreign	869		712
Corporate securities	8		—
Mortgage-backed securities	59		74
Equity securities	237		87
	$	2,039	$	1,737
Gross amount of recognized liability for securities lending payable	$	2,039	$	1,737

The following table presents the carrying value of collateral pledged under repurchase agreements by investment category and remaining contractual maturity of the underlying agreements:

	Remaining contractual maturity
	March 31, 2018						December 31, 2017
	30-90 Days		Greater than 90 Days		Total		Up to 30 Days		Greater than 90 Days		Total
(in millions of U.S. dollars)
Collateral pledged under repurchase agreements:
U.S. Treasury and agency	$	—	$	243	$	243	$	9	$	230	$	239
Mortgage-backed securities	486		731		1,217		369		826		1,195
	$	486	$	974	$	1,460	$	378	$	1,056	$	1,434
Gross amount of recognized liabilities for repurchase agreements					$	1,412					$	1,408
Difference (1)					$	48					$	26

Net Realized Gains (Losses) Of Derivative Instrument Activity In Consolidated Statement Of Operations

The following table presents net realized gains (losses) related to derivative instrument activity in the Consolidated statements of operations:

	Three Months Ended
	March 31
(in millions of U.S. dollars)	2018		2017
Investment and embedded derivative instruments:
Foreign currency forward contracts	$	4	$	14
All other futures contracts and options	13		(8		)
Total investment and embedded derivative instruments	$	17	$	6
GLB and other derivative instruments:
GLB (1)	$	38	$	93
Futures contracts on equities (2)	22		(74		)
Other	2		2
Total GLB and other derivative instruments	$	62	$	21
	$	79	$	27

⁽¹⁾  Excludes foreign exchange gains (losses) related to GLB.

⁽²⁾  Related to GMDB and GLB blocks of business.

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Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2018

Stockholders' Equity Note [Abstract]

Dividends Declared [Table Text Block]

Share Repurchase Program [Table Text Block]

The following table presents repurchases of Chubb's Common Shares conducted in a series of open market transactions under the Board authorizations:

	Three Months Ended March 31
(in millions of U.S. dollars, except share data)	2018		2017
Number of shares repurchased	—		1,036,064
Cost of shares repurchased	$	—	$	140
Repurchase authorization remaining at end of period	$	1,000	$	860

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Postretirement benefits (Tables)

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

9. Postretirement benefits

The components of net pension and other postretirement benefit costs (benefits) reflected in Net income in the Consolidated statements of operations were as follows:

	Pension Benefits												Other Postretirement Benefits
	2018						2017						2018			2017
Three Months Ended March 31	U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans
(in millions of U.S. dollars)
Service cost	$	14		$	3		$	16		$	4		$	—		$	—
Interest cost	26			7			26			7			1			1
Expected return on plan assets	(53		)	(13		)	(47		)	(10		)	(1		)	(1		)
Amortization of prior service cost	—			—			—			—			(21		)	(23		)
Net periodic (benefit) cost	$	(13	)	$	(3	)	$	(5	)	$	1		$	(21	)	$	(23	)

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Segment information (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Operations By Segment

The following tables present the Statement of Operations by segment:

	North America Commercial P&C Insurance			North America Personal P&C Insurance			North America Agricultural Insurance			Overseas General Insurance		Global Reinsurance			Life Insurance			Corporate			Chubb Consolidated
For the Three Months Ended
March 31, 2018
(in millions of U.S. dollars)
Net premiums written	$	2,812		$	1,048		$	108		$	2,384	$	193		$	559		$	—		$	7,104
Net premiums earned	3,029			1,140			43			2,107		168			540			—			7,027
Losses and loss expenses	1,908			886			(53		)	1,078		67			205			11			4,102
Policy benefits	—			—			—			—		—			151			—			151
Policy acquisition costs	472			237			(1		)	588		40			128			—			1,464
Administrative expenses	231			65			(3		)	239		10			78			72			692
Underwriting income (loss)	418			(48		)	100			202		51			(22		)	(83		)	618
Net investment income (loss)	503			59			7			151		64			83			(61		)	806
Other (income) expense	(6		)	—			—			7		(7		)	(4		)	(37		)	(47		)
Amortization expense of purchased intangibles	—			3			7			10		—			1			64			85
Segment income (loss)	$	927		$	8		$	100		$	336	$	122		$	64		$	(171	)	$	1,386
Net realized gains (losses) including OTTI																		(2		)	(2		)
Interest expense																		157			157
Chubb integration expenses																		10			10
Income tax expense																		135			135
Net income (loss)																		$	(475	)	$	1,082

	North America Commercial P&C Insurance (1)		North America Personal P&C Insurance		North America Agricultural Insurance			Overseas General Insurance (1)			Global Reinsurance		Life Insurance			Corporate			Chubb Consolidated
For the Three Months Ended
March 31, 2017
(in millions of U.S. dollars)
Net premiums written	$	2,730	$	984	$	61		$	2,212		$	199	$	524		$	—		$	6,710
Net premiums earned	3,041		1,086		14			1,936			189		506			—			6,772
Losses and loss expenses	1,860		633		(73		)	1,071			94		193			11			3,789
Policy benefits	—		—		—			—			—		168			—			168
Policy acquisition costs	487		217		(1		)	529			51		114			—			1,397
Administrative expenses	231		65		(5		)	245			10		72			58			676
Underwriting income (loss)	463		171		93			91			34		(41		)	(69		)	742
Net investment income (loss)	478		55		6			148			62		75			(79		)	745
Other (income) expense	4		1		—			(1		)	—		(29		)	(45		)	(70		)
Amortization expense of purchased intangibles	—		3		7			11			—		1			42			64
Segment income (loss)	$	937	$	222	$	92		$	229		$	96	$	62		$	(145	)	$	1,493
Net realized gains (losses) including OTTI																(7		)	(7		)
Interest expense																154			154
Chubb integration expenses																111			111
Income tax expense																128			128
Net income (loss)																$	(545	)	$	1,093

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Earnings per share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share, Basic And Diluted

	Three Months Ended
	March 31
(in millions of U.S. dollars, except share and per share data)	2018		2017
Numerator:
Net income	$	1,082	$	1,093
Denominator:
Denominator for basic earnings per share:
Weighted-average shares outstanding	465,703,240		468,903,086
Denominator for diluted earnings per share:
Share-based compensation plans	3,770,351		3,828,604
Weighted-average shares outstanding and assumed conversions	469,473,591		472,731,690
Basic earnings per share	$	2.32	$	2.33
Diluted earnings per share	$	2.30	$	2.31
Potential anti-dilutive share conversions	2,116,188		969,654

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Information provided in connection with outstanding debt of subsidiaries (Tables)

3 Months Ended

Mar. 31, 2018

Table Text Block Supplement [Abstract]

Condensed Consolidating Balance Sheet

Condensed Consolidating Balance Sheet at March 31, 2018

(in millions of U.S. dollars)	Chubb Limited (Parent Guarantor)		Chubb INA Holdings Inc. (Subsidiary Issuer)		Other Chubb Limited Subsidiaries		Consolidating Adjustments and Eliminations			Chubb Limited Consolidated
Assets
Investments	$	—	$	186	$	101,919	$	—		$	102,105
Cash (1)	1		864		1,523		(400		)	1,988
Restricted cash	—		—		125		—			125
Insurance and reinsurance balances receivable	—		—		10,308		(738		)	9,570
Reinsurance recoverable on losses and loss expenses	—		—		26,093		(11,111		)	14,982
Reinsurance recoverable on policy benefits	—		—		1,181		(1,000		)	181
Value of business acquired	—		—		321		—			321
Goodwill and other intangible assets	—		—		22,123		—			22,123
Investments in subsidiaries	43,032		51,930		—		(94,962		)	—
Due from subsidiaries and affiliates, net	8,980		—		251		(9,231		)	—
Other assets	4		386		18,459		(1,463		)	17,386
Total assets	$	52,017	$	53,366	$	182,303	$	(118,905	)	$	168,781
Liabilities
Unpaid losses and loss expenses	$	—	$	—	$	74,299	$	(11,160	)	$	63,139
Unearned premiums	—		—		16,563		(1,068		)	15,495
Future policy benefits	—		—		6,412		(1,000		)	5,412
Due to subsidiaries and affiliates, net	—		9,231		—		(9,231		)	—
Affiliated notional cash pooling programs (1)	400		—		—		(400		)	—
Repurchase agreements	—		—		1,412		—			1,412
Short-term debt	—		1,669		—		—			1,669
Long-term debt	—		12,775		11		—			12,786
Trust preferred securities	—		308		—		—			308
Other liabilities	330		1,537		16,490		(1,084		)	17,273
Total liabilities	730		25,520		115,187		(23,943		)	117,494
Total shareholders’ equity	51,287		27,846		67,116		(94,962		)	51,287
Total liabilities and shareholders’ equity	$	52,017	$	53,366	$	182,303	$	(118,905	)	$	168,781

⁽¹⁾  Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2018, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

Condensed Consolidating Balance Sheet at December 31, 2017

(in millions of U.S. dollars)	Chubb Limited (Parent Guarantor)		Chubb INA Holdings Inc. (Subsidiary Issuer)		Other Chubb Limited Subsidiaries		Consolidating Adjustments and Eliminations			Chubb Limited Consolidated
Assets
Investments	$	—	$	168	$	102,276	$	—		$	102,444
Cash (1)	3		1		839		(115		)	728
Restricted cash	—		—		123		—			123
Insurance and reinsurance balances receivable	—		—		10,820		(1,486		)	9,334
Reinsurance recoverable on losses and loss expenses	—		—		27,514		(12,480		)	15,034
Reinsurance recoverable on policy benefits	—		—		1,194		(1,010		)	184
Value of business acquired	—		—		326		—			326
Goodwill and other intangible assets	—		—		22,054		—			22,054
Investments in subsidiaries	41,909		51,165		—		(93,074		)	—
Due from subsidiaries and affiliates, net	9,639		—		—		(9,639		)	—
Other assets	3		287		20,578		(4,073		)	16,795
Total assets	$	51,554	$	51,621	$	185,724	$	(121,877	)	$	167,022
Liabilities
Unpaid losses and loss expenses	$	—	$	—	$	74,767	$	(11,588	)	$	63,179
Unearned premiums	—		—		18,875		(3,659		)	15,216
Future policy benefits	—		—		6,331		(1,010		)	5,321
Due to subsidiaries and affiliates, net	—		9,432		207		(9,639		)	—
Affiliated notional cash pooling programs (1)	—		115		—		(115		)	—
Repurchase agreements	—		—		1,408		—			1,408
Short-term debt	—		1,013		—		—			1,013
Long-term debt	—		11,546		10		—			11,556
Trust preferred securities	—		308		—		—			308
Other liabilities	382		1,411		18,848		(2,792		)	17,849
Total liabilities	382		23,825		120,446		(28,803		)	115,850
Total shareholders’ equity	51,172		27,796		65,278		(93,074		)	51,172
Total liabilities and shareholders’ equity	$	51,554	$	51,621	$	185,724	$	(121,877	)	$	167,022

⁽¹⁾  Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2017, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

Condensed Consolidating Statement Of Operations and Comprehensive Income

Condensed Consolidating Statements of Operations and Comprehensive Income

For the Three Months Ended March 31, 2018	Chubb Limited (Parent Guarantor)			Chubb INA Holdings Inc. (Subsidiary Issuer)			Other Chubb Limited Subsidiaries			Consolidating Adjustments and Eliminations			Chubb Limited Consolidated
(in millions of U.S. dollars)
Net premiums written	$	—		$	—		$	7,104		$	—		$	7,104
Net premiums earned	—			—			7,027			—			7,027
Net investment income	2			4			800			—			806
Equity in earnings of subsidiaries	1,022			885			—			(1,907		)	—
Net realized gains (losses) including OTTI	(2		)	(24		)	24			—			(2		)
Losses and loss expenses	—			—			4,102			—			4,102
Policy benefits	—			—			151			—			151
Policy acquisition costs and administrative expenses	18			22			2,116			—			2,156
Interest (income) expense	(80		)	209			28			—			157
Other (income) expense	(5		)	8			(50		)	—			(47		)
Amortization of purchased intangibles	—			—			85			—			85
Chubb integration expenses	2			1			7			—			10
Income tax expense (benefit)	5			(59		)	189			—			135
Net income	$	1,082		$	684		$	1,223		$	(1,907	)	$	1,082
Comprehensive income	$	453		$	216		$	614		$	(830	)	$	453

Condensed Consolidating Statements of Operations and Comprehensive Income

For the Three Months Ended March 31, 2017	Chubb Limited (Parent Guarantor)			Chubb INA Holdings Inc. (Subsidiary Issuer)			Other Chubb Limited Subsidiaries			Consolidating Adjustments and Eliminations			Chubb Limited Consolidated
(in millions of U.S. dollars)
Net premiums written	$	—		$	—		$	6,710		$	—		$	6,710
Net premiums earned	—			—			6,772			—			6,772
Net investment income	—			3			742			—			745
Equity in earnings of subsidiaries	1,027			701			—			(1,728		)	—
Net realized gains (losses) including OTTI	—			(13		)	6			—			(7		)
Losses and loss expenses	—			—			3,789			—			3,789
Policy benefits	—			—			168			—			168
Policy acquisition costs and administrative expenses	18			14			2,041			—			2,073
Interest (income) expense	(84		)	221			17			—			154
Other (income) expense	(6		)	15			(79		)	—			(70		)
Amortization of purchased intangibles	—			—			64			—			64
Chubb integration expenses	—			49			62			—			111
Income tax expense (benefit)	6			(112		)	234			—			128
Net income	$	1,093		$	504		$	1,224		$	(1,728	)	$	1,093
Comprehensive income	$	1,407		$	791		$	1,538		$	(2,329	)	$	1,407

Condensed Consolidating Statement of Cash Flows

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2018	Chubb Limited (Parent Guarantor)			Chubb INA Holdings Inc. (Subsidiary Issuer)			Other Chubb Limited Subsidiaries			Consolidating Adjustments and Eliminations			Chubb Limited Consolidated
(in millions of U.S. dollars)
Net cash flows from operating activities	$	24		$	2,727		$	800		$	(3,000	)	$	551
Cash flows from investing activities
Purchases of fixed maturities available for sale	—			(8		)	(5,964		)	—			(5,972		)
Purchases of fixed maturities held to maturity	—			—			(162		)	—			(162		)
Purchases of equity securities	—			—			(55		)	—			(55		)
Sales of fixed maturities available for sale	—			—			2,562			—			2,562
Sales of equity securities	—			—			40			—			40
Maturities and redemptions of fixed maturities available for sale	—			3			1,862			—			1,865
Maturities and redemptions of fixed maturities held to maturity	—			—			255			—			255
Net change in short-term investments	—			(14		)	745			—			731
Net derivative instruments settlements	—			(7		)	46			—			39
Private equity contributions	—			—			(353		)	—			(353		)
Private equity distributions	—			—			201			—			201
Capital contribution	(750		)	(3,500		)	—			4,250			—
Other	—			(3		)	(29		)	—			(32		)
Net cash flows used for investing activities	(750		)	(3,529		)	(852		)	4,250			(881		)
Cash flows from financing activities
Dividends paid on Common Shares	(330		)	—			—			—			(330		)
Common Shares repurchased	—			—			(29		)	—			(29		)
Proceeds from issuance of long-term debt	—			2,175			—			—			2,175
Repayment of long-term debt	—			(300		)	—			—			(300		)
Proceeds from issuance of repurchase agreements	—			—			408			—			408
Repayment of repurchase agreements	—			—			(404		)	—			(404		)
Proceeds from share-based compensation plans	—			—			34			—			34
Dividend to parent company	—			—			(3,000		)	3,000			—
Advances (to) from affiliates	656			(95		)	(561		)	—			—
Capital contribution	—			—			4,250			(4,250		)	—
Net proceeds from (payments to) affiliated notional cash pooling programs(1)	400			(115		)	—			(285		)	—
Policyholder contract deposits	—			—			118			—			118
Policyholder contract withdrawals	—			—			(105		)	—			(105		)
Net cash flows from financing activities	726			1,665			711			(1,535		)	1,567
Effect of foreign currency rate changes on cash and restricted cash	(2		)	—			27			—			25
Net increase (decrease) in cash and restricted cash	(2		)	863			686			(285		)	1,262
Cash and restricted cash – beginning of period(1)	3			1			962			(115		)	851
Cash and restricted cash – end of period(1)	$	1		$	864		$	1,648		$	(400	)	$	2,113

⁽¹⁾  Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2018 and December 31, 2017, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2017	Chubb Limited (Parent Guarantor)			Chubb INA Holdings Inc. (Subsidiary Issuer)			Other Chubb Limited Subsidiaries			Consolidating Adjustments and Eliminations			Chubb Limited Consolidated
(in millions of U.S. dollars)
Net cash flows from (used for) operating activities	$	584		$	(156	)	$	1,081		$	(496	)	$	1,013
Cash flows from investing activities
Purchases of fixed maturities available for sale	—			(4		)	(6,246		)	—			(6,250		)
Purchases of fixed maturities held to maturity	—			—			(157		)	—			(157		)
Purchases of equity securities	—			—			(37		)	—			(37		)
Sales of fixed maturities available for sale	—			—			3,395			—			3,395
Sales of equity securities	—			—			46			—			46
Maturities and redemptions of fixed maturities    available for sale	—			7			2,536			—			2,543
Maturities and redemptions of fixed maturities held to maturity	—			—			240			—			240
Net change in short-term investments	—			173			59			—			232
Net derivative instruments settlements	—			(2		)	(87		)	—			(89		)
Private equity contributions	—			—			(198		)	—			(198		)
Private equity distributions	—			—			315			—			315
Other	—			—			(106		)	—			(106		)
Net cash flows from (used for) investing activities	—			174			(240		)	—			(66		)
Cash flows from financing activities
Dividends paid on Common Shares	(324		)	—			—			—			(324		)
Common Shares repurchased	—			—			(128		)	—			(128		)
Proceeds from issuance of repurchase agreements	—			—			753			—			753
Repayment of long-term debt	—			(500		)	—			—			(500		)
Repayment of repurchase agreements	—			—			(752		)	—			(752		)
Proceeds from share-based compensation plans	—			—			42			—			42
Dividend to parent company	—			—			(496		)	496			—
Advances (to) from affiliates	108			(171		)	63			—			—
Net proceeds from (payments to) affiliated notional cash pooling programs(1)	(363		)	653			—			(290		)	—
Policyholder contract deposits	—			—			109			—			109
Policyholder contract withdrawals	—			—			(58		)	—			(58		)
Net cash flows used for financing activities	(579		)	(18		)	(467		)	206			(858		)
Effect of foreign currency rate changes on cash and restricted cash	—			—			(17		)	—			(17		)
Net increase in cash and restricted cash	5			—			357			(290		)	72
Cash and restricted cash – beginning of period(1)	1			1			2,068			(982		)	1,088
Cash and restricted cash – end of period(1)	$	6		$	1		$	2,425		$	(1,272	)	$	1,160

⁽¹⁾  Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2017 and December 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

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General Schedule of Cash and Cash Equivalent (Details) - USD ($) $ in Millions		Mar. 31, 2018		Dec. 31, 2017		Mar. 31, 2017	Dec. 31, 2016
Cash and Cash Equivalents [Line Items]
Cash		$ 1,988	[1]	$ 728	[2]
Restricted Cash	[1]	125		123
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		$ 2,113		$ 851		$ 1,160	$ 1,088

[1] Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2018, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[2] Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2017, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

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General Goodwill (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Period Increase (Decrease)	$ 145

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General Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		$ 450
Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect on Retained Earnings, Tax	$ 7
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	$ 454
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent			$ 416

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Investments (Narrative) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) Security	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Investment [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis	$ 948		$ 737
Net unrealized appreciation (depreciation) included in OCI	4	$ 0
Unrealized appreciation(depreciation) portion of AOCI with OTTI included in AOCI	$ 3		$ 7
Percentage of mortgage-backed securities represented by investments in US government agency bonds	82.00%		83.00%
Total number of fixed maturities | Security	31,179
Restricted assets in fixed maturities and short-term investments	$ 23,600		$ 23,300
Restricted assets in cash	$ 125		123
Moodys Historical Mean Recovery Rate	42.00%
Company Assumed Recovery Rate	32.00%
Number of fixed maturities in an unrealized loss position | Security	15,699
Largest single unrealized loss in the fixed maturities	$ 10
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax			212
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax			12
Equity securities, at fair value (cost – $948 and $737)	948		$ 937
Corporate [Member]
Investment [Line Items]
Credit losses recognized in net income	0	1
Collateralized Mortgage Backed Securities [Member]
Investment [Line Items]
Credit losses recognized in net income	$ 0	$ 0

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Investments Investments (Schedule Of Amortized Cost and Fair Value of Available-for-sale Securities and Related OTTI Recognized in AOCI) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	$ 79,208	$ 77,835
Available-for-sale,Gross Unrealized Gain	981	1,528
Available-for-sale, Gross Unrealized Depreciation	(1,078)	(424)
Available for sale, Fair Value	79,111	78,939
Available for sale, OTTI recognized in AOCI	(5)	(6)
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	3,893	3,701
Available-for-sale,Gross Unrealized Gain	22	32
Available-for-sale, Gross Unrealized Depreciation	(77)	(35)
Available for sale, Fair Value	3,838	3,698
Available for sale, OTTI recognized in AOCI	0	0
Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	21,705	20,514
Available-for-sale,Gross Unrealized Gain	513	622
Available-for-sale, Gross Unrealized Depreciation	(187)	(106)
Available for sale, Fair Value	22,031	21,030
Available for sale, OTTI recognized in AOCI	0	(1)
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	23,509	23,453
Available-for-sale,Gross Unrealized Gain	332	638
Available-for-sale, Gross Unrealized Depreciation	(274)	(95)
Available for sale, Fair Value	23,567	23,996
Available for sale, OTTI recognized in AOCI	(4)	(4)
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	16,116	15,279
Available-for-sale,Gross Unrealized Gain	53	111
Available-for-sale, Gross Unrealized Depreciation	(349)	(100)
Available for sale, Fair Value	15,820	15,290
Available for sale, OTTI recognized in AOCI	(1)	(1)
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	13,985	14,888
Available-for-sale,Gross Unrealized Gain	61	125
Available-for-sale, Gross Unrealized Depreciation	(191)	(88)
Available for sale, Fair Value	13,855	14,925
Available for sale, OTTI recognized in AOCI	$ 0	$ 0

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Investments (Schedule Of Amortized Cost And Fair Value Of HTM Fixed Maturities And Related OTTI Recognized In Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Held to maturity, Amortized Cost	$ 14,253	$ 14,335
Held to maturity, Gross Unrealized Appreciation	81	179
Held to maturity, Gross Unrealized Depreciation	(212)	(40)
Held to maturity, at Fair Value	14,122	14,474
Held to maturity, OTTI recognized in AOCI		0
U.S. Treasury And Agency [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	1,037	908
Held to maturity, Gross Unrealized Appreciation	9	12
Held to maturity, Gross Unrealized Depreciation	(14)	(5)
Held to maturity, at Fair Value	1,032	915
Held to maturity, OTTI recognized in AOCI	0	0
Foreign [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	1,754	1,738
Held to maturity, Gross Unrealized Appreciation	17	27
Held to maturity, Gross Unrealized Depreciation	(20)	(8)
Held to maturity, at Fair Value	1,751	1,757
Held to maturity, OTTI recognized in AOCI	0	0
Corporate [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	3,026	3,159
Held to maturity, Gross Unrealized Appreciation	26	67
Held to maturity, Gross Unrealized Depreciation	(55)	(7)
Held to maturity, at Fair Value	2,997	3,219
Held to maturity, OTTI recognized in AOCI	0	0
Collateralized Mortgage Backed Securities [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	2,681	2,724
Held to maturity, Gross Unrealized Appreciation	11	23
Held to maturity, Gross Unrealized Depreciation	(45)	(5)
Held to maturity, at Fair Value	2,647	2,742
Held to maturity, OTTI recognized in AOCI	0	0
States, Municipalities, And Political Subdivisions [Member]
Investment [Line Items]
Held to maturity, Amortized Cost	5,755	5,806
Held to maturity, Gross Unrealized Appreciation	18	50
Held to maturity, Gross Unrealized Depreciation	(78)	(15)
Held to maturity, at Fair Value	5,695	5,841
Held to maturity, OTTI recognized in AOCI	$ 0	$ 0

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Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Amortized Cost	$ 3,735	$ 3,164
Available for sale, Due after 1 year through 5 years, Amortized Cost	25,140	24,749
Available for sale, Due after 5 years though 10 years, Amortized Cost	25,243	25,388
Available for sale, Due after 10 years, Amortized Cost	8,974	9,255
Available for sale, Subtotal, Amortized Cost	63,092	62,556
Available for sale, Mortgage-backed securities, Amortized Cost	16,116	15,279
Available for sale, at amortized cost	79,208	77,835
Available for sale, Due in 1 year or less, Fair Value	3,746	3,182
Available for sale, Due after 1 year through 5 years, Fair Value	25,251	25,068
Available for sale, Due after 5 years through 10 years, Fair Value	25,097	25,704
Available for sale, Due after 10 years, Fair Value	9,197	9,695
Available for sale, Subtotal, Fair Value	63,291	63,649
Available for sale, Mortgage backed securities, Fair Value	15,820	15,290
Available for sale, Fair Value	79,111	78,939
Held to maturity, Due in 1 year or less, Amortized Cost	838	743
Held to maturity, Due after 1 year through 5 years, Amortized Cost	2,684	2,669
Held to maturity, Due after 5 years through 10 years, Amortized Cost	4,713	4,744
Held to maturity, Due after 10 years, Amortized Cost	3,337	3,455
Held to maturity, Subtotal, Amortized Cost	11,572	11,611
Held to maturity, Mortgage backed securities, Amortized Cost	2,681	2,724
Held to maturity, Amortized Cost	14,253	14,335
Held to maturity, Due in 1 year or less, Fair Value	840	746
Held to maturity, Due after 1 year through 5, Fair Value	2,678	2,688
Held to maturity, Due after 5 years through 10 years, Fair Value	4,635	4,756
Held to maturity, Due after 10 years, Fair Value	3,322	3,542
Held to maturity, Subtotal, Fair Value	11,475	11,732
Held to maturity, Mortgage backed securities, Fair Value	2,647	2,742
Held to maturity, Fair Value	$ 14,122	$ 14,474

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Investments (Net Realized Gains (Losses) And Losses Included In Net Realized Gains (Losses) And Other Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment (OTTI) losses gross	$ (1)	$ (19)
OTTI on fixed maturities recognized in OCI (pre-tax)	0	0
Foreign exchange gains	(77)	(19)
Derivative instrument	79	27
Fair Value Adjustments On Insurance Derivative Gains Losses	38	93
Net realized gains (losses)	(2)	(7)
Investment and embedded derivative instruments
Gain (Loss) on Investments [Line Items]
Derivative instrument	17	6
S&P put options and futures
Gain (Loss) on Investments [Line Items]
Derivative instrument	22	(74)
Other derivative instruments
Gain (Loss) on Investments [Line Items]
Derivative instrument	2	2
Fixed Maturities [Member]
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment (OTTI) losses gross	(1)	(6)
OTTI on fixed maturities recognized in OCI (pre-tax)	0	0
OTTI on fixed maturities, net	(1)	(6)
Fixed maturities, Gross realized gains excluding OTTI	66	34
Fixed maturities, Gross realized losses excluding OTTI	(88)	(40)
Total fixed maturities	(23)	(12)
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
OTTI on equity securities	0	(5)
Realized Investment Gains (Losses)	(11)
Equity Securities, Gross realized gains excluding OTTI	10	9
Equity Securities, Gross realized losses excluding OTTI	(21)	0
Total equity securities	(11)	4
Other Investments [Member]
Gain (Loss) on Investments [Line Items]
OTTI on equity securities	0	(8)
Realized Investment Gains (Losses)	29	0
Other	$ 1	$ 1

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Investments (Roll-Forward Of Pre-Tax Credit Losses Related To Fixed Maturities For Which Portion Of Other-Than-Temporary Impairment Was Recognized In Other Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Roll-Forward Of Pre-Tax Credit Losses Related To Fixed Maturities For Which Portion Of Other-Than-Temporary Impairment Was Recognized In Other Comprehensive Income [Roll Forward]
Balance of credit losses related to securities still held – beginning of period	$ 22	$ 35
Additions where no OTTI was previously recorded	0	0
Additions where an OTTI was previously recorded	0	1
Reductions for securities sold during the period	(7)	(4)
Balance of credit losses related to securities still held – end of period	$ 15	$ 32

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Investments Schedule of Gains and Losses on Equity and Other Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Gain (Loss) on Sale of Investments	$ 10
Realized Investment Gains (Losses)	(11)
Unrealized Gain (Loss) on Investments	(21)
Other Investments [Member]
Gain (Loss) on Investments [Line Items]
Gain (Loss) on Sale of Investments	0
Realized Investment Gains (Losses)	29	$ 0
Unrealized Gain (Loss) on Investments	$ 29

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Investments (Aggregate Fair Value And Gross Unrealized Loss By Length Of Time Security Has Continuously Been In Unrealized Loss Position) (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Fair Value, 0-12 Months		$ 28,685
Gross Unrealized Loss, 0-12 Months		(257)
Fair Value, Over 12 Months		8,885
Gross Unrealized Loss, Over 12 Months		(227)
Total Fair Value		37,570
Total Gross Unrealized Loss		(484)
U.S. Treasury And Agency [Member]
Investment [Line Items]
Fair Value, 0-12 Months	$ 2,869	2,172
Gross Unrealized Loss, 0-12 Months	(55)	(14)
Fair Value, Over 12 Months	1,314	1,249
Gross Unrealized Loss, Over 12 Months	(36)	(26)
Total Fair Value	4,183	3,421
Total Gross Unrealized Loss	(91)	(40)
Foreign [Member]
Investment [Line Items]
Fair Value, 0-12 Months	8,715	5,657
Gross Unrealized Loss, 0-12 Months	(155)	(65)
Fair Value, Over 12 Months	1,643	1,693
Gross Unrealized Loss, Over 12 Months	(52)	(49)
Total Fair Value	10,358	7,350
Total Gross Unrealized Loss	(207)	(114)
Corporate [Member]
Investment [Line Items]
Fair Value, 0-12 Months	12,355	5,210
Gross Unrealized Loss, 0-12 Months	(260)	(56)
Fair Value, Over 12 Months	1,501	1,332
Gross Unrealized Loss, Over 12 Months	(69)	(46)
Total Fair Value	13,856	6,542
Total Gross Unrealized Loss	(329)	(102)
Collateralized Mortgage Backed Securities [Member]
Investment [Line Items]
Fair Value, 0-12 Months	12,313	6,194
Gross Unrealized Loss, 0-12 Months	(257)	(31)
Fair Value, Over 12 Months	3,033	3,209
Gross Unrealized Loss, Over 12 Months	(137)	(74)
Total Fair Value	15,346	9,403
Total Gross Unrealized Loss	(394)	(105)
States, Municipalities, And Political Subdivisions [Member]
Investment [Line Items]
Fair Value, 0-12 Months	15,030	9,259
Gross Unrealized Loss, 0-12 Months	(218)	(71)
Fair Value, Over 12 Months	1,343	1,402
Gross Unrealized Loss, Over 12 Months	(51)	(32)
Total Fair Value	16,373	10,661
Total Gross Unrealized Loss	(269)	(103)
Fixed Maturities [Member]
Investment [Line Items]
Fair Value, 0-12 Months	51,282	28,492
Gross Unrealized Loss, 0-12 Months	(945)	(237)
Fair Value, Over 12 Months	8,834	8,885
Gross Unrealized Loss, Over 12 Months	(345)	(227)
Total Fair Value	60,116	37,377
Total Gross Unrealized Loss	$ (1,290)	(464)
Equity Securities [Member]
Investment [Line Items]
Fair Value, 0-12 Months		115
Gross Unrealized Loss, 0-12 Months		(12)
Fair Value, Over 12 Months		0
Gross Unrealized Loss, Over 12 Months		0
Total Fair Value		115
Total Gross Unrealized Loss		(12)
Other Long-term Investments [Member]
Investment [Line Items]
Fair Value, 0-12 Months		78
Gross Unrealized Loss, 0-12 Months		(8)
Fair Value, Over 12 Months		0
Gross Unrealized Loss, Over 12 Months		0
Total Fair Value		78
Total Gross Unrealized Loss		$ (8)

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Investments (Schedule Of Components Of Restricted Assets) (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Trust funds	$ 17,029	$ 17,011
Deposits with U.S. regulatory authorities	2,463	2,345
Deposits with non-U.S. regulatory authorities	2,290	2,250
Assets pledged under repurchase agreements	1,460	1,434
Other pledged assets	433	414
Total restricted assets	$ 23,675	$ 23,454

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Fair value measurements Fair Value Measurements (narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Level 1 to Level 2 transfers, Amount	$ 0	$ 0
Fair Value, Level 2 to Level 1 Transfers, Amount		$ 0
Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notice Period For Redemption For Alternative Investments Investment Funds	5 days
Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notice Period For Redemption For Alternative Investments Investment Funds	120 days

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Fair Value Measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Detail) - USD ($) $ in Millions		Mar. 31, 2018		Dec. 31, 2017		Mar. 31, 2017	[4]	Dec. 31, 2016	[4]	Mar. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		$ 79,111		$ 78,939
Equity securities, at fair value		948		937
Other Investments		4,919		4,672
Securities lending collateral		2,039		1,737
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Other Investments		3,866		3,623
Other Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Other Investments		14		15
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		79,111		78,939
Equity securities, at fair value		948		937
Short-term investments		2,874		3,561
Other Investments		1,039		1,034
Securities lending collateral		2,039		1,737
Investment derivative instruments, assets		25		18
Other Derivative Instruments Fair Value		78		1
Separate Account Assets		2,874		2,734
Total assets measured at fair value		88,988	[1]	88,961	[2]
Investment derivative instruments, liabilities		29		30
Other derivative instruments, liability		2		23
Liabilities, Fair Value Disclosure, Recurring		198		257
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		3,094		3,129
Equity securities, at fair value		884		893
Short-term investments		1,735		2,309
Other Investments		451		466
Investment derivative instruments, assets		25		18
Other Derivative Instruments Fair Value		78		1
Separate Account Assets		2,774		2,635
Total assets measured at fair value		9,041	[1]	9,451	[2]
Investment derivative instruments, liabilities		29		30
Other derivative instruments, liability				21
Liabilities, Fair Value Disclosure, Recurring		29		51
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		74,685		74,602
Short-term investments		1,127		1,252
Other Investments		318		305
Securities lending collateral		2,039		1,737
Separate Account Assets		100		99
Total assets measured at fair value		78,269	[1]	77,995	[2]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		1,332		1,208
Equity securities, at fair value		64		44
Short-term investments		12
Other Investments		270		263
Total assets measured at fair value		1,678	[1]	1,515	[2]
Other derivative instruments, liability		2		2
Liabilities, Fair Value Disclosure, Recurring		169		206
Fair Value, Measurements, Recurring [Member] | U.S. Treasury And Agency [Member] | Estimate of Fair Value Measurement [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		3,838		3,698
Fair Value, Measurements, Recurring [Member] | U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		3,094		3,129
Fair Value, Measurements, Recurring [Member] | U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		744		569
Fair Value, Measurements, Recurring [Member] | Foreign [Member] | Estimate of Fair Value Measurement [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		22,031		21,030
Fair Value, Measurements, Recurring [Member] | Foreign [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		21,855		20,937
Fair Value, Measurements, Recurring [Member] | Foreign [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		176		93
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Estimate of Fair Value Measurement [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		23,567		23,996
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		22,494		22,959
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		1,073		1,037
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | Estimate of Fair Value Measurement [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		15,820		15,290
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		15,737		15,212
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		83		78
Fair Value, Measurements, Recurring [Member] | States, Municipalities, And Political Subdivisions [Member] | Estimate of Fair Value Measurement [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		13,855		14,925
Fair Value, Measurements, Recurring [Member] | States, Municipalities, And Political Subdivisions [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale, Fair Value		13,855		14,925
Guaranteed Minimum Income Benefit [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		167	[3]	204	[3]	$ 466		$ 559		$ 559
Guaranteed Minimum Income Benefit [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		167	[5]	204
Guaranteed Minimum Income Benefit [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		$ 167	[5]	204	[6]
Guaranteed Minimum Income Benefit [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	[6]			$ 204

[1] (1) Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $3,866 million and other investments of $14 million at March 31, 2018 measured using NAV as a practical expedient.

[2] (1) Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $3,623 million and other investments of $15 million at December 31, 2017 measured using NAV as a practical expedient.

[3] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $529 million at March 31, 2018, and $550 million at December 31, 2017, which includes a fair value derivative adjustment of $167 million and $204 million, respectively.

[4] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $774 million at March 31, 2017, and $853 million at December 31, 2016, which includes a fair value derivative adjustment of $466 million and $559 million, respectively.

[5] (2) Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets.

[6] (2) Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets.

XML

Fair Value Measurements (Fair Value And Maximum Future Funding Commitments Related To Investments) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	$ 3,846	$ 4,061
Fair Value	3,866	3,623
Financial [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	327	330
Fair Value	$ 538	$ 540
Financial [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	5 years	5 years
Financial [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	9 years	9 years
Real Assets [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	$ 210	$ 114
Fair Value	$ 656	$ 651
Real Assets [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	3 years	3 years
Real Assets [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	7 years	7 years
Distressed [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	$ 131	$ 141
Fair Value	$ 295	$ 289
Distressed [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	3 years	3 years
Distressed [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	7 years	7 years
Private Credit [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	$ 320	$ 327
Fair Value	$ 173	$ 187
Private Credit [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	3 years	3 years
Private Credit [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	7 years	7 years
Traditional [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Maximum future funding commitments	$ 2,858	$ 3,149
Fair Value	$ 1,901	$ 1,656
Traditional [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	3 years	3 years
Traditional [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	15 years	15 years
Vintage [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 27	$ 30
Vintage [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	1 year	1 year
Vintage [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	2 years	2 years
Investment Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 276	$ 270

XML

Fair Value Measurements (Schedule Of Significant Unobservable Inputs Used In Level 3 Liability Valuations) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018		Dec. 31, 2017		Mar. 31, 2017	[3]	Dec. 31, 2016	[3]	Mar. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Measurements, Valuation Techniques	[1]	Actuarial model
Minimum [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate	[1]	3.00%
Significant Unobservable Inputs Annuitization Rate	[1]	0.00%
Maximum [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate	[1]	33.00%
Significant Unobservable Inputs Annuitization Rate	[1]	100.00%
Guaranteed Minimum Income Benefit [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		$ 167	[2]	$ 204	[2]	$ 466		$ 559		$ 559
Guaranteed Minimum Income Benefit [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		$ 167	[4]	204
Guaranteed Minimum Income Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	[5]			$ 204

[1] Discussion of the most significant inputs used in the fair value measurement of GLB and the sensitivity of those assumptions is included within Note 3 a) Guaranteed living benefits.

[2] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $529 million at March 31, 2018, and $550 million at December 31, 2017, which includes a fair value derivative adjustment of $167 million and $204 million, respectively.

[3] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $774 million at March 31, 2017, and $853 million at December 31, 2016, which includes a fair value derivative adjustment of $466 million and $559 million, respectively.

[4] (2) Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets.

[5] (2) Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets.

XML

Fair Value Measurements (Assets Measured At Fair Value Using Significant Unobservable Inputs) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	$ 44	$ 41
Transfers Into Level 3, Asset	0	0
Transfers out of Level 3, Assets	0	0
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss)	1	0
Net Realized Gains/ (Losses), Assets	2	0
Purchases, Assets	17	0
Sales, Assets	0	0
Settlements, Assets	0	0
Balance-End of Period, Assets	64	41
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	0
Short-term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	0	25
Transfers Into Level 3, Asset	5	0
Transfers out of Level 3, Assets	0	0
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0
Net Realized Gains/ (Losses), Assets	0	0
Purchases, Assets	8	7
Sales, Assets	0	0
Settlements, Assets	(1)	(11)
Balance-End of Period, Assets	12	21
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)		0
Other Long-term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	263	225
Transfers Into Level 3, Asset	0	0
Transfers out of Level 3, Assets	0	0
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss)	2	4
Net Realized Gains/ (Losses), Assets	0	0
Purchases, Assets	14	8
Sales, Assets	0	0
Settlements, Assets	(9)	(4)
Balance-End of Period, Assets	270	233
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	0
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	93	74
Transfers Into Level 3, Asset	7	0
Transfers out of Level 3, Assets	0	0
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss)	9	(1)
Net Realized Gains/ (Losses), Assets	0	(1)
Purchases, Assets	87	14
Sales, Assets	(19)	(3)
Settlements, Assets	(1)	(3)
Balance-End of Period, Assets	176	80
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	0
Available-for-sale Securities [Member] | Corporate [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	1,037	681
Transfers Into Level 3, Asset	0	29
Transfers out of Level 3, Assets	(10)	(54)
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss)	(3)	(8)
Net Realized Gains/ (Losses), Assets	0	(1)
Purchases, Assets	139	156
Sales, Assets	(51)	(27)
Settlements, Assets	(39)	(39)
Balance-End of Period, Assets	1,073	737
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	0
Available-for-sale Securities [Member] | Collateralized Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	78	45
Transfers Into Level 3, Asset	1	0
Transfers out of Level 3, Assets	0	0
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0
Net Realized Gains/ (Losses), Assets	0	0
Purchases, Assets	4	1
Sales, Assets	0	(1)
Settlements, Assets	0	0
Balance-End of Period, Assets	83	45
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	$ 0	$ 0

XML

Fair value measurements Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018		Mar. 31, 2017		Dec. 31, 2017	Mar. 31, 2016
Guaranteed Minimum Income Benefit [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Reported liabilities	$ 529		$ 774		$ 550	$ 853
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance - Beginning of Period, Liabilities	204	[1]	559	[2]
Transfers into level 3, liability	0		0
Transfers out of Level 3, Liabilities	0		0
Change in Net Unrealized Gains (Losses) included in OCI, Liabilities	0		0
Net Realized Gains/Losses, Liabilities	(37)		(93)
Purchases, Liabilities	0		0
Sales, Liabilities	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	0		0
Balance - End of Period, Liabilities	167	[1]	466	[2]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(37)		(93)
Other Derivative Instruments Fair Value [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance - Beginning of Period, Liabilities	2		13
Transfers into level 3, liability	0		0
Transfers out of Level 3, Liabilities	0		0
Change in Net Unrealized Gains (Losses) included in OCI, Liabilities	0		0
Net Realized Gains/Losses, Liabilities	0		(2)
Purchases, Liabilities	0		0
Sales, Liabilities	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	0		0
Balance - End of Period, Liabilities	2		11
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	$ 0		$ (2)

[1] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $529 million at March 31, 2018, and $550 million at December 31, 2017, which includes a fair value derivative adjustment of $167 million and $204 million, respectively.

[2] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $774 million at March 31, 2017, and $853 million at December 31, 2016, which includes a fair value derivative adjustment of $466 million and $559 million, respectively.

XML

Fair Value Measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	$ 14,122	$ 14,474
Held-to-maturity Securities	14,253	14,335
Repurchase agreements	1,412	1,408
Short-term debt	1,669	1,013
Long-term debt	12,786	11,556
Trust preferred securities	308	308
Total liabilities	117,494	115,850
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	977	857
Repurchase agreements	0	0
Short-term Debt, Fair Value	0	0
Long-term Debt, Fair Value	0	0
Trust preferred securities	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	13,112	13,582
Repurchase agreements	1,412	1,408
Short-term Debt, Fair Value	1,704	1,013
Long-term Debt, Fair Value	13,023	12,332
Trust preferred securities	466	468
Total liabilities	16,605	15,221
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	33	35
Repurchase agreements	0	0
Short-term Debt, Fair Value	0	0
Long-term Debt, Fair Value	0	0
Trust preferred securities	0	0
Total liabilities	0	0
U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	977	857
U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	55	58
U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Foreign [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Foreign [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	1,751	1,757
Foreign [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Corporate [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Corporate [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	2,964	3,184
Corporate [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	33	35
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	2,647	2,742
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	0	0
States, Municipalities, And Political Subdivisions [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	0	0
States, Municipalities, And Political Subdivisions [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	5,695	5,841
States, Municipalities, And Political Subdivisions [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	14,122	14,474
Repurchase agreements	1,412	1,408
Short-term Debt, Fair Value	1,704	1,013
Long-term Debt, Fair Value	13,023	12,332
Trust preferred securities	466	468
Total liabilities	16,605	15,221
Estimate of Fair Value Measurement [Member] | U.S. Treasury And Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	1,032	915
Estimate of Fair Value Measurement [Member] | Foreign [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	1,751	1,757
Estimate of Fair Value Measurement [Member] | Corporate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	2,997	3,219
Estimate of Fair Value Measurement [Member] | Collateralized Mortgage Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	2,647	2,742
Estimate of Fair Value Measurement [Member] | States, Municipalities, And Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Fair Value	5,695	5,841
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities	14,253	14,335
Repurchase agreements	1,412	1,408
Short-term debt	1,669	1,013
Long-term debt	12,786	11,556
Trust preferred securities	308	308
Total liabilities	16,175	14,285
Reported Value Measurement [Member] | U.S. Treasury And Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities	1,037	908
Reported Value Measurement [Member] | Foreign [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities	1,754	1,738
Reported Value Measurement [Member] | Corporate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities	3,026	3,159
Reported Value Measurement [Member] | Collateralized Mortgage Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities	2,681	2,724
Reported Value Measurement [Member] | States, Municipalities, And Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities	$ 5,755	$ 5,806

XML

Unpaid losses and loss expenses (RF) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Unpaid Losses and Loss Expenses [Roll Forward]
Gross unpaid losses and loss expenses, beginning of period		$ 63,179	$ 60,540
Reinsurance Recoverable on unpaid losses, beginning of period	[1]	(14,014)	(12,708)
Net unpaid loss, beginning of period		49,165	47,832
Current Year Claims and Claims Adjustment Expense		4,358	4,078
PPD, Gross	[2]	(256)	(289)
Total, Incurred		4,102	3,789
Net loss and loss expenses paid, Current Year		809	798
Net losses and loss expenses Paid, Prior Years		3,433	3,109
Total, Paid		4,242	3,907
Liability For Unpaid Claims And Claims Adjustment Expense Foreign Currency Revaluation And Other		292	54
Net unpaid Loss, end of period		49,317	47,768
Reinsurance Recoverables on unpaid losses, end of period	[3]	13,822	12,811
Gross unpaid losses and loss expenses, end of period		63,139	60,579
prior period development, net adjustments		47	58
Reinsurance Recoverables, Allowance		$ 320	$ 334	$ 321	$ 300

[1] (1) Net of provision for uncollectible reinsurance of $321 million and $300 million at December 31, 2017 and 2016, respectively.

[2] Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments, and earned premiums totaling $47 million and $58 million for the three months ended March 31, 2018 and 2017, respectively.

[3] 3) Net of provision for uncollectible reinsurance of $320 million and $334 million at March 31, 2018 and 2017, respectively.

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Unpaid losses and loss expenses Unpaid losses and loss expenses (PPD table) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	$ (209)	$ (231)
North America Commercial P&C Insurance [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	(101)	(179)
North America Personal P&C Insurance [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	(6)	(3)
North American Agriculture Insurance [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	(76)	(79)
Overseas General Insurance [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	(22)	12
Global Reinsurance [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	(14)	8
Corporate Segment [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	10	10
Long Tail [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	18	(44)
Long Tail [Member] | North America Commercial P&C Insurance [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	8	(94)
Long Tail [Member] | North America Personal P&C Insurance [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	0	0
Long Tail [Member] | North American Agriculture Insurance [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	0	0
Long Tail [Member] | Overseas General Insurance [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	0	32
Long Tail [Member] | Global Reinsurance [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	0	8
Long Tail [Member] | Corporate Segment [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	10	10
Short Tail [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	(227)	(187)
Short Tail [Member] | North America Commercial P&C Insurance [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	(109)	(85)
Short Tail [Member] | North America Personal P&C Insurance [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	(6)	(3)
Short Tail [Member] | North American Agriculture Insurance [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	(76)	(79)
Short Tail [Member] | Overseas General Insurance [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	(22)	(20)
Short Tail [Member] | Global Reinsurance [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	(14)	0
Short Tail [Member] | Corporate Segment [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	$ 0	$ 0

XML

Unpaid losses and loss expenses Unpaid losses and loss expenses (narrative)(Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		$ (209)	$ (231)
Prior period reclassification adjustments	[1]		(12)
Long Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		18	(44)
Short Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		(227)	(187)
Prior period reclassification adjustments			5
North America Commercial P&C Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		(101)	(179)
North America Commercial P&C Insurance [Member] | Long Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		8	(94)
North America Commercial P&C Insurance [Member] | Short Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		(109)	(85)
North America Commercial P&C Insurance [Member] | Surety [Member] | Short Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		(19)
North America Commercial P&C Insurance [Member] | Commercial Excess and Umbrella [Member] | Long Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		(29)
North America Commercial P&C Insurance [Member] | Other [Member] | Long Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		40
North America Commercial P&C Insurance [Member] | Other [Member] | Short Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		(34)
North America Commercial P&C Insurance [Member] | Wholesale General Liability Lines [Member] | Long Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		16
North America Commercial P&C Insurance [Member] | Catastrophe [Member] | Long Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		(3)
North America Commercial P&C Insurance [Member] | Accident year 2017 [Member] | Property and Inland Marine [Member] | Short Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		(75)
North America Commercial P&C Insurance [Member] | Accident year 2015 [Member] | Surety [Member] | Short Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse			(45)
North America Commercial P&C Insurance [Member] | Accident Year 2010 and Prior [Member] | Commercial Excess and Umbrella [Member] | Long Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse			(74)
North America Commercial P&C Insurance [Member] | Accident year 2015 and 2016 [Member] | Accident and Health Insurance Product Line [Member] | Short Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse			(24)
North America Commercial P&C Insurance [Member] | Accident years 2011 - 2013 [Member] | Professional Liability Insurance [Member] | Long Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse			(32)
North America Personal [Member] | Short Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		(6)	(3)
North America Agricultural Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		(76)	(79)
North America Agricultural Insurance [Member] | Long Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		0	0
North America Agricultural Insurance [Member] | Short Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		(76)	(79)
Overseas General Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		(22)	12
Overseas General Insurance [Member] | Long Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		0	32
Overseas General Insurance [Member] | Short Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		(22)	(20)
Overseas General Insurance [Member] | Catastrophe [Member] | Short Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		(12)
Overseas General Insurance [Member] | Accident years 2016 and prior [Member] | Casualty [Member] | Long Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse			32
Global Reinsurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		(14)	8
Global Reinsurance [Member] | Catastrophe [Member] | Short Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		(10)
Global Reinsurance [Member] | Accident year 2015 and prior [Member] | Auto Liability Excess Lines [Member] | Long Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse			9
Global Reinsurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		(14)	8
Global Reinsurance [Member] | Long Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		0	8
Global Reinsurance [Member] | Short Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		(14)	0
Corporate Segment [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		10	10
Corporate Segment [Member] | Long Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		10	10
Corporate Segment [Member] | Short Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
PPD (Favorable) / Adverse		$ 0	$ 0

[1] (1) The 2017 net premiums written amount was revised to reflect the transfer of certain multinational accounts ($12 million) from the North America Commercial P&C Insurance segment to the Overseas General Insurance segment to better align the reporting with the management of these businesses in 2018. There is no impact on a consolidated basis.

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Debt (Detail) € in Millions, $ in Millions	Apr. 06, 2018 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 EUR (€)
Chubb INA Capital Securities Due 2067 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,000
Chubb INA Capital Securities Due 2067 [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 1,000
Debt Instrument, Interest Rate, Stated Percentage		6.375%	6.375%
Debt, Current		$ 964
Senior Notes [Member] | INA Senior Notes Due March 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 300
Debt Instrument, Interest Rate, Stated Percentage		5.80%	5.80%
Senior Notes [Member] | INA Senior Note Due March 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 1,100	€ 900
Debt Instrument, Interest Rate, Stated Percentage		1.55%	1.55%
Make Whole Premium Additional Percent		0.15%	0.15%
Senior Notes [Member] | INA Senior Note Due March 2038 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 1,100	€ 900
Debt Instrument, Interest Rate, Stated Percentage		2.50%	2.50%
Make Whole Premium Additional Percent		0.25%	0.25%

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Commitments, Contingencies, And Guarantees (Narrative) (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Financial Instruments Owned and Pledged as Collateral [Line Items]
Derivative asset subject to a master netting agreement	$ 79
Derivative liability subject to a master netting agreement		$ 24
Repurchase agreements	1,412	$ 1,408
Purchase Commitment, Remaining Minimum Amount Committed	1,139
Carrying value of limited partnerships and partially-owned investment companies included in other investments	3,600
Funding commitments relating to limited partnerships and partially-owned investment companies	3,800
Unrecognized tax benefits	$ 14

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Commitments, Contingencies, And Guarantees (Balance Sheet Locations, Fair Values In Asset Or (Liability) Position, And Notional Values/Payment Provisions Of Derivative Instruments) (Detail) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		$ 2,125	$ 2,064
Cross Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		45	45
Fair Value, Asset		0	0
Options/Futures contracts on notes and bonds
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		1,093	1,007
Convertible securities [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		8	6	[1]
Investment And Embedded Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		3,271	3,122
Fair Value, Asset		32	23
Future contracts on equities [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision	[2]	1,625	1,553
Other Derivatives [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		326	75
Other Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision		1,951	1,628
Guaranteed Minimum Income Benefit [Member]
Derivatives, Fair Value [Line Items]
Notional Value/Payment Provision	[3]	1,175	1,083
Fair Value, Asset	[3]	0	0
Fixed Maturities [Member] | Convertible securities [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset		7	5
Equity [Member] | Convertible securities [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability		0	0
Other Assets [Member] | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Fair Value, Asset		19	14
Other Assets [Member] | Options/Futures contracts on notes and bonds
Derivatives, Fair Value [Line Items]
Fair Value, Asset		6	4
Other Assets [Member] | Future contracts on equities [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset	[2]	71	0
Other Assets [Member] | Other Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset		7	1
Other Assets [Member] | Other Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Asset		78	1
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(17)	(27)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Cross Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability		0	0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Options/Futures contracts on notes and bonds
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(12)	(3)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Investment And Embedded Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(29)	(30)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Future contracts on equities [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability	[2]	0	(21)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(2)	(2)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(2)	(23)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Guaranteed Minimum Income Benefit [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability	[3]	$ (529)	$ (550)

[1] Includes fair value of embedded derivatives.

[2] Related to GMDB and GLB blocks of business.

[3] Includes both future policy benefits reserves and fair value derivative adjustment. Note that the payment provision related to GLB is the net amount at risk. The concept of a notional value does not apply to the GLB reinsurance contracts.

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Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Transactions accounted for as secured borrowings) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	$ 2,039	$ 1,737
Securities lending payable	2,039	1,737
Cash and Cash Equivalents [Member] | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	826	828
U.S. Treasury And Agency [Member] | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	40	36
Foreign Government Debt [Member] | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	869	712
Corporate [Member] | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	8	0
Collateralized Mortgage Backed Securities [Member] | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	59	74
Equity Securities [Member] | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	$ 237	$ 87

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Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Collateral pledged under repurchase agreements) (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		$ 1,460	$ 1,434
Repurchase agreements		1,412	1,408
U.S. Treasury And Agency [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		243	239
Collateralized Mortgage Backed Securities [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		1,217	1,195
Repurchase Agreements [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Secured Borrowings, Gross, Difference, Amount	[1]	48	26
Maturity Less than 30 Days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		486	378
Maturity Less than 30 Days [Member] | U.S. Treasury And Agency [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		0	9
Maturity Less than 30 Days [Member] | Collateralized Mortgage Backed Securities [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		486	369
Maturity Greater than 90 Days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		974	1,056
Maturity Greater than 90 Days [Member] | U.S. Treasury And Agency [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		243	230
Maturity Greater than 90 Days [Member] | Collateralized Mortgage Backed Securities [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		$ 731	$ 826

[1] (1) Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability.

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Commitments, Contingencies, And Guarantees (Net Realized Gains (Losses) Of Derivative Instrument Activity In Consolidated Statement Of Operations) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	$ 79	$ 27
Foreign currency forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	4	14
All Other Futures Contracts And Options [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	13	(8)
Investment And Embedded Derivative Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	17	6
Guaranteed Minimum Income Benefit [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	38	93
Future contracts on equities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	22	(74)
Other Derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	2	2
Guaranteed Living Benefit And Other Derivative Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	$ 62	$ 21

XML

Share-Based Compensation (Detail) - $ / shares		3 Months Ended
	Feb. 22, 2018	Mar. 31, 2018
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period in years		3 years
Award term period in years		10 years
Stock options granted	1,841,329
Weighted-average grant date fair value for stock options granted	$ 29.71
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period in years		4 years
Restricted stock awards granted to employees and officers of the company	973,624
Grant date fair value of awards except for options granted to employees and officers of the company	$ 143.07
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period in years		4 years
Restricted stock awards granted to employees and officers of the company	180,065
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards granted to employees and officers of the company	301,024

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Shareholders' equity (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) SFr / shares shares	Mar. 31, 2017 USD ($) $ / shares	Mar. 31, 2017 USD ($) SFr / shares	Mar. 31, 2018 SFr / shares	Dec. 31, 2017 SFr / shares shares	Dec. 21, 2017 USD ($)	May 31, 2017 $ / shares	Nov. 30, 2016 USD ($)	May 31, 2016 $ / shares
Equity, Class of Treasury Stock [Line Items]
Common Shares, par value | SFr / shares					SFr 24.15	SFr 24.15
Annual dividend per share approved by shareholders | $ / shares								$ 2.84		$ 2.76
Common Shares in treasury, shares | shares	13,952,378	13,952,378				15,950,685
Common Stock, Dividend Rate Approved | $ / shares								$ 0.71		$ 0.69
Common Stock, Dividend Rate Declared | (per share)	$ 0.71	SFr 0.66	$ 0.69	SFr 0.69
Dec 2017 Stock Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized amount of share repurchase program							$ 1,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 1,000	SFr 1,000
Nov 2016 Stock Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized amount of share repurchase program									$ 1,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 860	SFr 860

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Shareholders' equity Share Repurchases (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Nov 2016 Stock Repurchase Plan [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired		1,036,064
Treasury Stock, Value, Acquired, Cost Method		$ 140
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 860
2017 Stock Repurchase Plan [Member] [Domain]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired	0
Treasury Stock, Value, Acquired, Cost Method	$ 0

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Postretirement benefits Components of net periodic benefit costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pension Plan [Member] | UNITED STATES
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 14	$ 16
Interest cost	26	26
Expected return on plan assets	(53)	(47)
Amortization of prior service cost	0	0
Net periodic (benefit) cost	(13)	(5)
Pension Plan [Member] | Non-US [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	3	4
Interest cost	7	7
Expected return on plan assets	(13)	(10)
Amortization of prior service cost	0	0
Net periodic (benefit) cost	(3)	1
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0	0
Interest cost	1	1
Expected return on plan assets	(1)	(1)
Amortization of prior service cost	(21)	(23)
Net periodic (benefit) cost	$ (21)	$ (23)

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Segment information Segment Information (narrative Detail (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Gain (Loss) on Derivative	$ 79	$ 27
Net investment income	806	745
North America Agricultural Insurance [Member]
Segment Reporting Information [Line Items]
Segment Income Loss Including Gains Losses On Crop Derivatives	102
Gain (Loss) on Derivative	2
Net investment income	7	6
Segment Life [Member]
Segment Reporting Information [Line Items]
Net investment income	83	$ 75
Management Underwriting Income (Loss)	67
Gains Losses On Fair Value Changes In Separate Account Assets	$ 6

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Segment Information (Operations By Segment) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Net premiums written		$ 7,104	$ 6,710
Net premiums earned		7,027	6,772
Losses and loss expenses		4,102	3,789
Policy benefits		151	168
Policy acquisition costs		1,464	1,397
Administrative expenses		692	676
Underwriting income (loss)		618	742
Net investment income		806	745
Other (income) expense		(47)	(70)
Amortization of purchased intangibles		85	64
Segment Income (loss)		1,386	1,493
Net realized gains (losses) including OTTI		(2)	(7)
Interest expense		157	154
Chubb integration expenses		10	111
Income tax expense		135	128
Net income		1,082	1,093
Prior Period Reclassification Adjustment	[1]		12
North America Commercial P&C Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written		2,812	2,730	[1]
Net premiums earned		3,029	3,041
Losses and loss expenses		1,908	1,860
Policy benefits		0	0
Policy acquisition costs		472	487
Administrative expenses		231	231
Underwriting income (loss)		418	463
Net investment income		503	478
Other (income) expense		(6)	4
Amortization of purchased intangibles		0	0
Segment Income (loss)		927	937
North America Personal P&C Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written		1,048	984
Net premiums earned		1,140	1,086
Losses and loss expenses		886	633
Policy benefits		0	0
Policy acquisition costs		237	217
Administrative expenses		65	65
Underwriting income (loss)		(48)	171
Net investment income		59	55
Other (income) expense		0	1
Amortization of purchased intangibles		3	3
Segment Income (loss)		8	222
North America Agricultural Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written		108	61
Net premiums earned		43	14
Losses and loss expenses		(53)	(73)
Policy benefits		0	0
Policy acquisition costs		(1)	(1)
Administrative expenses		(3)	(5)
Underwriting income (loss)		100	93
Net investment income		7	6
Other (income) expense		0	0
Amortization of purchased intangibles		7	7
Segment Income (loss)		100	92
Overseas General Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written		2,384	2,212	[1]
Net premiums earned		2,107	1,936
Losses and loss expenses		1,078	1,071
Policy benefits		0	0
Policy acquisition costs		588	529
Administrative expenses		239	245
Underwriting income (loss)		202	91
Net investment income		151	148
Other (income) expense		7	(1)
Amortization of purchased intangibles		10	11
Segment Income (loss)		336	229
Global Reinsurance [Member]
Segment Reporting Information [Line Items]
Net premiums written		193	199
Net premiums earned		168	189
Losses and loss expenses		67	94
Policy benefits		0	0
Policy acquisition costs		40	51
Administrative expenses		10	10
Underwriting income (loss)		51	34
Net investment income		64	62
Other (income) expense		(7)	0
Amortization of purchased intangibles		0	0
Segment Income (loss)		122	96
Life Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written		559	524
Net premiums earned		540	506
Losses and loss expenses		205	193
Policy benefits		151	168
Policy acquisition costs		128	114
Administrative expenses		78	72
Underwriting income (loss)		(22)	(41)
Net investment income		83	75
Other (income) expense		(4)	(29)
Amortization of purchased intangibles		1	1
Segment Income (loss)		64	62
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Net premiums written		0	0
Net premiums earned		0	0
Losses and loss expenses		11	11
Policy benefits		0	0
Policy acquisition costs		0	0
Administrative expenses		72	58
Underwriting income (loss)		(83)	(69)
Net investment income		(61)	(79)
Other (income) expense		(37)	(45)
Amortization of purchased intangibles		64	42
Segment Income (loss)		(171)	(145)
Net realized gains (losses) including OTTI		(2)	(7)
Interest expense		157	154
Chubb integration expenses		10	111
Income tax expense		135	128
Net income		$ (475)	$ (545)

[1] (1) The 2017 net premiums written amount was revised to reflect the transfer of certain multinational accounts ($12 million) from the North America Commercial P&C Insurance segment to the Overseas General Insurance segment to better align the reporting with the management of these businesses in 2018. There is no impact on a consolidated basis.

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Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 1,082	$ 1,093
Weighted-average shares outstanding	465,703,240	468,903,086
Share-based compensation plans	3,770,351	3,828,604
Weighted-average shares outstanding and assumed conversions	469,473,591	472,731,690
Basic earnings per share (US$ per share)	$ 2.32	$ 2.33
Diluted earnings per share (US$ per share)	$ 2.30	$ 2.31
Potential anti-dilutive share conversions	2,116,188	969,654

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Information provided in connection with outstanding debt of subsidiaries Information provided in connection with outstanding debt of subsidiaries (Narrative) (Details)	Mar. 31, 2018
Debt Instrument [Line Items]
Equity Method Investment, Ownership Percentage	100.00%

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Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Detail) - USD ($) $ in Millions		Mar. 31, 2018		Dec. 31, 2017		Mar. 31, 2017	Dec. 31, 2016
Condensed Balance Sheet Statements, Captions [Line Items]
Investments		$ 102,105		$ 102,444
Cash		1,988	[1]	728	[2]
Restricted Cash	[1]	125		123
Insurance and reinsurance balances receivable		9,570		9,334
Reinsurance Recoverable Losses And Loss Expenses		14,982		15,034
Reinsurance recoverable on policy benefits		181		184
Value of business acquired		321		326
Goodwill and other intangible assets		22,123		22,054
Investments in subsidiaries		0		0
Due from subsidiaries and affiliates, net		0		0
Other assets		17,386		16,795
Total assets		168,781		167,022
Unpaid losses and loss expenses		63,139		63,179		$ 60,579	$ 60,540
Unearned premiums		15,495		15,216
Future policy benefits		5,412		5,321
Due to subsidiaries and affiliates, net		0		0
Affiliated notional cash pooling programs		0		0
Repurchase agreements		1,412		1,408
Short-term debt		1,669		1,013
Long-term debt		12,786		11,556
Trust preferred securities		308		308
Other liabilities		17,273		17,849
Total liabilities		117,494		115,850
Total shareholders' equity		51,287		51,172		$ 49,224
Total liabilities and shareholders’ equity		168,781		167,022
Chubb Limited (Parent Guarantor)
Condensed Balance Sheet Statements, Captions [Line Items]
Investments		0		0
Cash		1	[1]	3	[2]
Restricted Cash	[1]	0		0
Insurance and reinsurance balances receivable		0		0
Reinsurance Recoverable Losses And Loss Expenses		0		0
Reinsurance recoverable on policy benefits		0		0
Value of business acquired		0		0
Goodwill and other intangible assets		0		0
Investments in subsidiaries		43,032		41,909
Due from subsidiaries and affiliates, net		8,980		9,639
Other assets		4		3
Total assets		52,017		51,554
Unpaid losses and loss expenses		0		0
Unearned premiums		0		0
Future policy benefits		0		0
Due to subsidiaries and affiliates, net		0		0
Affiliated notional cash pooling programs		400	[1]	0	[2]
Repurchase agreements		0		0
Short-term debt		0		0
Long-term debt		0		0
Trust preferred securities		0		0
Other liabilities		330		382
Total liabilities		730		382
Total shareholders' equity		51,287		51,172
Total liabilities and shareholders’ equity		52,017		51,554
Chubb INA Holdings Inc (Subsidiary Issuer)
Condensed Balance Sheet Statements, Captions [Line Items]
Investments		186		168
Cash		864	[1]	1	[2]
Restricted Cash	[1]	0		0
Insurance and reinsurance balances receivable		0		0
Reinsurance Recoverable Losses And Loss Expenses		0		0
Reinsurance recoverable on policy benefits		0		0
Value of business acquired		0		0
Goodwill and other intangible assets		0		0
Investments in subsidiaries		51,930		51,165
Due from subsidiaries and affiliates, net		0		0
Other assets		386		287
Total assets		53,366		51,621
Unpaid losses and loss expenses		0		0
Unearned premiums		0		0
Future policy benefits		0		0
Due to subsidiaries and affiliates, net		9,231		9,432
Affiliated notional cash pooling programs		0	[1]	115	[2]
Repurchase agreements		0		0
Short-term debt		1,669		1,013
Long-term debt		12,775		11,546
Trust preferred securities		308		308
Other liabilities		1,537		1,411
Total liabilities		25,520		23,825
Total shareholders' equity		27,846		27,796
Total liabilities and shareholders’ equity		53,366		51,621
Other Chubb Limited Subsidiaries
Condensed Balance Sheet Statements, Captions [Line Items]
Investments		101,919		102,276
Cash		1,523	[1]	839	[2]
Restricted Cash	[1]	125		123
Insurance and reinsurance balances receivable		10,308		10,820
Reinsurance Recoverable Losses And Loss Expenses		26,093		27,514
Reinsurance recoverable on policy benefits		1,181		1,194
Value of business acquired		321		326
Goodwill and other intangible assets		22,123		22,054
Investments in subsidiaries		0		0
Due from subsidiaries and affiliates, net		251		0
Other assets		18,459		20,578
Total assets		182,303		185,724
Unpaid losses and loss expenses		74,299		74,767
Unearned premiums		16,563		18,875
Future policy benefits		6,412		6,331
Due to subsidiaries and affiliates, net		0		207
Affiliated notional cash pooling programs		0	[1]	0	[2]
Repurchase agreements		1,412		1,408
Short-term debt		0		0
Long-term debt		11		10
Trust preferred securities		0		0
Other liabilities		16,490		18,848
Total liabilities		115,187		120,446
Total shareholders' equity		67,116		65,278
Total liabilities and shareholders’ equity		182,303		185,724
Consolidating Adjustments and Eliminations
Condensed Balance Sheet Statements, Captions [Line Items]
Investments		0		0
Cash		(400)	[1]	(115)	[2]
Restricted Cash	[1]	0		0
Insurance and reinsurance balances receivable		(738)		(1,486)
Reinsurance Recoverable Losses And Loss Expenses		(11,111)		(12,480)
Reinsurance recoverable on policy benefits		(1,000)		(1,010)
Value of business acquired		0		0
Goodwill and other intangible assets		0		0
Investments in subsidiaries		(94,962)		(93,074)
Due from subsidiaries and affiliates, net		(9,231)		(9,639)
Other assets		(1,463)		(4,073)
Total assets		(118,905)		(121,877)
Unpaid losses and loss expenses		(11,160)		(11,588)
Unearned premiums		(1,068)		(3,659)
Future policy benefits		(1,000)		(1,010)
Due to subsidiaries and affiliates, net		(9,231)		(9,639)
Affiliated notional cash pooling programs		(400)	[1]	(115)	[2]
Repurchase agreements		0		0
Short-term debt		0		0
Long-term debt		0		0
Trust preferred securities		0		0
Other liabilities		(1,084)		(2,792)
Total liabilities		(23,943)		(28,803)
Total shareholders' equity		(94,962)		(93,074)
Total liabilities and shareholders’ equity		$ (118,905)		$ (121,877)

[1] Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2018, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[2] Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2017, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

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Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Operations) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Statement of Income Captions [Line Items]
Net premiums written	$ 7,104	$ 6,710
Net premiums earned	7,027	6,772
Net investment income	806	745
Income (Loss) from Subsidiaries, Net of Tax	0	0
Net realized gains (losses) including OTTI	(2)	(7)
Losses and loss expenses	4,102	3,789
Policy benefits	151	168
Policy acquisition costs and administrative expenses	2,156	2,073
Interest (income) expense	157	154
Other (income) expense	(47)	(70)
Amortization of purchased intangibles	85	64
Chubb integration expenses	10	111
Income tax expense	135	128
Net income	1,082	1,093
Comprehensive income (loss)	453	1,407
Consolidating Adjustments and Eliminations
Condensed Statement of Income Captions [Line Items]
Net premiums written	0	0
Net premiums earned	0	0
Net investment income	0	0
Income (Loss) from Subsidiaries, Net of Tax	(1,907)	(1,728)
Net realized gains (losses) including OTTI	0	0
Losses and loss expenses	0	0
Policy benefits	0	0
Policy acquisition costs and administrative expenses	0	0
Interest (income) expense	0	0
Other (income) expense	0	0
Amortization of purchased intangibles	0	0
Chubb integration expenses	0	0
Income tax expense	0	0
Net income	(1,907)	(1,728)
Comprehensive income (loss)	(830)	(2,329)
Chubb Limited (Parent Guarantor)
Condensed Statement of Income Captions [Line Items]
Net premiums written	0	0
Net premiums earned	0	0
Net investment income	2	0
Income (Loss) from Subsidiaries, Net of Tax	1,022	1,027
Net realized gains (losses) including OTTI	(2)	0
Losses and loss expenses	0	0
Policy benefits	0	0
Policy acquisition costs and administrative expenses	18	18
Interest (income) expense	(80)	(84)
Other (income) expense	(5)	(6)
Amortization of purchased intangibles	0	0
Chubb integration expenses	2	0
Income tax expense	5	6
Net income	1,082	1,093
Comprehensive income (loss)	453	1,407
Chubb INA Holdings Inc (Subsidiary Issuer)
Condensed Statement of Income Captions [Line Items]
Net premiums written	0	0
Net premiums earned	0	0
Net investment income	4	3
Income (Loss) from Subsidiaries, Net of Tax	885	701
Net realized gains (losses) including OTTI	(24)	(13)
Losses and loss expenses	0	0
Policy benefits	0	0
Policy acquisition costs and administrative expenses	22	14
Interest (income) expense	209	221
Other (income) expense	8	15
Amortization of purchased intangibles	0	0
Chubb integration expenses	1	49
Income tax expense	(59)	(112)
Net income	684	504
Comprehensive income (loss)	216	791
Other Chubb Limited Subsidiaries
Condensed Statement of Income Captions [Line Items]
Net premiums written	7,104	6,710
Net premiums earned	7,027	6,772
Net investment income	800	742
Income (Loss) from Subsidiaries, Net of Tax	0	0
Net realized gains (losses) including OTTI	24	6
Losses and loss expenses	4,102	3,789
Policy benefits	151	168
Policy acquisition costs and administrative expenses	2,116	2,041
Interest (income) expense	28	17
Other (income) expense	(50)	(79)
Amortization of purchased intangibles	85	64
Chubb integration expenses	7	62
Income tax expense	189	234
Net income	1,223	1,224
Comprehensive income (loss)	$ 614	$ 1,538

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Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Cash Flows) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018		Mar. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows from operating activities	$ 551		$ 1,013
Purchases of fixed maturities available for sale	(5,972)		(6,250)
Purchases of fixed maturities held to maturity	(162)		(157)
Purchases of equity securities	(55)		(37)
Sales of fixed maturities available for sale	2,562		3,395
Sales of equity securities	40		46
Maturities and redemptions of fixed maturities available for sale	1,865		2,543
Maturities and redemptions of fixed maturities held to maturity	255		240
Net change in short-term investments	731		232
Net derivative instruments settlements	39		(89)
Private equity contribution	(353)		(198)
Private equity distribution	201		315
Payment Of Contributions To Subsidiary	0
Other	(32)		(106)
Net cash flows used for investing activities	(881)		(66)
Dividends paid on Common Shares	(330)		(324)
Common Shares repurchased	(29)		(128)
Proceeds from Issuance of Long-term Debt	2,175		0
Proceeds from issuance of long-term debt	(300)		(500)
Proceeds from issuance of repurchase agreements	408		753
Repayments of repurchase agreements	(404)		(752)
Proceeds from share-based compensation plans	34		42
Dividend to Parent Company	0		0
Advances (to) from affiliates	0		0
Capital contribution	0		0
Net proceeds from (payments to) affiliated notional cash pooling program	0		0
Policyholder contract deposits	118		109
Policyholder contract withdrawals	(105)		(58)
Net cash flows from (used for) financing activities	1,567		(858)
Effect of foreign currency rate changes on cash and restricted cash	25		(17)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	1,262		72
Cash and Restricted Cash - Beginning of year	851		1,088
Cash and Restricted Cash - end of Year	2,113		1,160
Chubb Limited (Parent Guarantor)
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows from operating activities	24		584
Purchases of fixed maturities available for sale	0		0
Purchases of fixed maturities held to maturity	0		0
Purchases of equity securities	0		0
Sales of fixed maturities available for sale	0		0
Sales of equity securities	0		0
Maturities and redemptions of fixed maturities available for sale	0		0
Maturities and redemptions of fixed maturities held to maturity	0		0
Net change in short-term investments	0		0
Net derivative instruments settlements	0		0
Private equity contribution	0		0
Private equity distribution	0		0
Payment Of Contributions To Subsidiary	750
Other	0		0
Net cash flows used for investing activities	(750)		0
Dividends paid on Common Shares	(330)		(324)
Common Shares repurchased	0		0
Proceeds from Issuance of Long-term Debt	0		0
Proceeds from issuance of long-term debt	0		0
Proceeds from issuance of repurchase agreements	0		0
Repayments of repurchase agreements	0		0
Proceeds from share-based compensation plans	0		0
Dividend to Parent Company	0		0
Advances (to) from affiliates	656		108
Capital contribution	0		0
Net proceeds from (payments to) affiliated notional cash pooling program	400	[1]	(363)	[2]
Policyholder contract deposits	0		0
Policyholder contract withdrawals	0		0
Net cash flows from (used for) financing activities	726		(579)
Effect of foreign currency rate changes on cash and restricted cash	(2)		0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(2)		5
Cash and Restricted Cash - Beginning of year	3		1
Cash and Restricted Cash - end of Year	1		6
Chubb INA Holdings Inc (Subsidiary Issuer)
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows from operating activities	2,727		(156)
Purchases of fixed maturities available for sale	(8)		(4)
Purchases of fixed maturities held to maturity	0		0
Purchases of equity securities	0		0
Sales of fixed maturities available for sale	0		0
Sales of equity securities	0		0
Maturities and redemptions of fixed maturities available for sale	3		7
Maturities and redemptions of fixed maturities held to maturity	0		0
Net change in short-term investments	(14)		173
Net derivative instruments settlements	(7)		(2)
Private equity contribution	0		0
Private equity distribution	0		0
Payment Of Contributions To Subsidiary	3,500
Other	(3)		0
Net cash flows used for investing activities	(3,529)		174
Dividends paid on Common Shares	0		0
Common Shares repurchased	0		0
Proceeds from Issuance of Long-term Debt	2,175		0
Proceeds from issuance of long-term debt	(300)		(500)
Proceeds from issuance of repurchase agreements	0		0
Repayments of repurchase agreements	0		0
Proceeds from share-based compensation plans	0		0
Dividend to Parent Company	0		0
Advances (to) from affiliates	(95)		(171)
Capital contribution	0		0
Net proceeds from (payments to) affiliated notional cash pooling program	(115)	[1]	653	[2]
Policyholder contract deposits	0		0
Policyholder contract withdrawals	0		0
Net cash flows from (used for) financing activities	1,665		(18)
Effect of foreign currency rate changes on cash and restricted cash	0		0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	863		0
Cash and Restricted Cash - Beginning of year	1		1
Cash and Restricted Cash - end of Year	864		1
Other Chubb Limited Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows from operating activities	800		1,081
Purchases of fixed maturities available for sale	(5,964)		(6,246)
Purchases of fixed maturities held to maturity	(162)		(157)
Purchases of equity securities	(55)		(37)
Sales of fixed maturities available for sale	2,562		3,395
Sales of equity securities	40		46
Maturities and redemptions of fixed maturities available for sale	1,862		2,536
Maturities and redemptions of fixed maturities held to maturity	255		240
Net change in short-term investments	745		59
Net derivative instruments settlements	46		(87)
Private equity contribution	(353)		(198)
Private equity distribution	201		315
Payment Of Contributions To Subsidiary	0
Other	(29)		(106)
Net cash flows used for investing activities	(852)		(240)
Dividends paid on Common Shares	0		0
Common Shares repurchased	(29)		(128)
Proceeds from Issuance of Long-term Debt	0		0
Proceeds from issuance of long-term debt	0		0
Proceeds from issuance of repurchase agreements	408		753
Repayments of repurchase agreements	(404)		(752)
Proceeds from share-based compensation plans	34		42
Dividend to Parent Company	(3,000)		(496)
Advances (to) from affiliates	(561)		63
Capital contribution	4,250		0
Net proceeds from (payments to) affiliated notional cash pooling program	0	[1]	0	[2]
Policyholder contract deposits	118		109
Policyholder contract withdrawals	(105)		(58)
Net cash flows from (used for) financing activities	711		(467)
Effect of foreign currency rate changes on cash and restricted cash	27		(17)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	686		357
Cash and Restricted Cash - Beginning of year	962		2,068
Cash and Restricted Cash - end of Year	1,648		2,425
Consolidation, Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows from operating activities	(3,000)		(496)
Purchases of fixed maturities available for sale	0		0
Purchases of fixed maturities held to maturity	0		0
Purchases of equity securities	0		0
Sales of fixed maturities available for sale	0		0
Sales of equity securities	0		0
Maturities and redemptions of fixed maturities available for sale	0		0
Maturities and redemptions of fixed maturities held to maturity	0		0
Net change in short-term investments	0		0
Net derivative instruments settlements	0		0
Private equity contribution	0		0
Private equity distribution	0		0
Payment Of Contributions To Subsidiary	(4,250)
Other	0		0
Net cash flows used for investing activities	4,250		0
Dividends paid on Common Shares	0		0
Common Shares repurchased	0		0
Proceeds from Issuance of Long-term Debt	0		0
Proceeds from issuance of long-term debt	0		0
Proceeds from issuance of repurchase agreements	0		0
Repayments of repurchase agreements	0		0
Proceeds from share-based compensation plans	0		0
Dividend to Parent Company	3,000		496
Advances (to) from affiliates	0		0
Capital contribution	(4,250)		0
Net proceeds from (payments to) affiliated notional cash pooling program	(285)	[1]	(290)
Policyholder contract deposits	0		0
Policyholder contract withdrawals	0		0
Net cash flows from (used for) financing activities	(1,535)		206
Effect of foreign currency rate changes on cash and restricted cash	0		0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(285)		(290)
Cash and Restricted Cash - Beginning of year	(115)		(982)
Cash and Restricted Cash - end of Year	$ (400)		$ (1,272)

[1] Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2018 and December 31, 2017, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[2] Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2017 and December 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

XML

Label	Element	Value
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	$ 1,034,000,000
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	27,883,000,000
Adjustments for New Accounting Pronouncement [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1	(416,000,000)
Adjustments for New Accounting Pronouncement [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 409,000,000