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 June 30, 2013 

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 number 1-8661 

THE CHUBB CORPORATION

(Exact name of registrant as specified in its charter)

NEW JERSEY	13-2595722
(State or other jurisdiction of	(I. R. S. Employer
incorporation or organization)	Identification No.)
15 MOUNTAIN VIEW ROAD, WARREN, NEW JERSEY	07059
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code (908) 903-2000

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, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

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

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 shares of common stock outstanding as of June 30, 2013 was 255,514,506.

THE CHUBB CORPORATION

INDEX

	Page Number
Part I. Financial Information:
Item 1 — Financial Statements:
Consolidated Statements of Income for the Three Months and Six Months Ended June 30, 2013 and 2012		1
Consolidated Statements of Comprehensive Income for the Three Months and Six Months Ended June  30, 2013 and 2012		2
Consolidated Balance Sheets as of June 30, 2013 and December 31, 2012		3
Consolidated Statements of Shareholders’ Equity for the Six Months Ended June 30, 2013 and 2012		4
Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2013 and 2012		5
Notes to Consolidated Financial Statements		6
Item  2 — Management’s Discussion and Analysis of Financial Condition and Results of Operations		19
Item 4 — Controls and Procedures		50
Part II. Other Information:
Item 1A — Risk Factors		51
Item 2 — Unregistered Sales of Equity Securities and Use of Proceeds		51
Item 6 — Exhibits		52
Signatures		52

EX-31.1

EX-31.2

EX-32.1

EX-32.2

EX-101 INSTANCE DOCUMENT

EX-101 SCHEMADOCUMENT

EX-101 CALCULATION LINKBASE DOCUMENT

EX-101 LABELS LINKBASE DOCUMENT

EX-101 PRESENTATION LINKBASE DOCUMENT

EX-101 DEFINITION LINKBASE DOCUMENT

Page 1

Part I. FINANCIAL INFORMATION

Item 1 — Financial Statements

THE CHUBB CORPORATION

CONSOLIDATED STATEMENTS OF INCOME

PERIODS ENDED JUNE 30

(in millions)

	Second Quarter						Six Months
	2013			2012			2013			2012
Revenues
Premiums Earned	$	2,995		$	2,983		$	5,999		$	5,934
Investment Income		368			390			740			791
Other Revenues		9			3			12			5
Realized Investment Gains (Losses), Net
Total Other-Than-Temporary Impairment Losses on Investments		(5	)		(30	)		(7	)		(35	)
Other-Than-Temporary Impairment Losses on Investments Recognized in Other Comprehensive Income		—			(1	)		—			(2	)
Other Realized Investment Gains, Net		184			78			324			140
Total Realized Investment Gains, Net		179			47			317			103
Total Revenues		3,551			3,423			7,068			6,833
Losses and Expenses
Losses and Loss Expenses		1,694			1,860			3,262			3,567
Amortization of Deferred Policy Acquisition Costs		617			607			1,204			1,183
Other Insurance Operating Costs and Expenses		358			351			717			717
Investment Expenses		13			10			26			21
Other Expenses		11			3			17			6
Corporate Expenses		62			65			130			133
Total Losses and Expenses		2,755			2,896			5,356			5,627
Income Before Federal and Foreign Income Tax		796			527			1,712			1,206
Federal and Foreign Income Tax		217			123			477			296
Net Income	$	579		$	404		$	1,235		$	910
Net Income Per Share
Basic	$	2.22		$	1.49		$	4.72		$	3.33
Diluted		2.21			1.48			4.69			3.31
Dividends Declared Per Share		.44			.41			.88			.82

See Notes to Consolidated Financial Statements.

Page 2

THE CHUBB CORPORATION

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

PERIODS ENDED JUNE 30

(in millions)

	Second Quarter						Six Months
	2013			2012			2013			2012
Net Income	$	579		$	404		$	1,235		$	910
Other Comprehensive Income (Loss), Net of Tax
Change in Unrealized Appreciation of Investments		(700	)		67			(696	)		121
Change in Unrealized Other-Than-Temporary Impairment Losses on Investments		—			1			—			2
Foreign Currency Translation Gains (Losses)		28			(28	)		(22	)		(37	)
Change in Postretirement Benefit Costs Not Yet Recognized in Net Income		14			14			31			28
		(658	)		54			(687	)		114
Comprehensive Income (Loss)	$	(79	)	$	458		$	548		$	1,024

See Notes to Consolidated Financial Statements.

Page 3

THE CHUBB CORPORATION

CONSOLIDATED BALANCE SHEETS

(in millions)

	June 30 2013			December 31 2012
Assets
Invested Assets
Short Term Investments	$	2,002		$	2,528
Fixed Maturities (cost $35,837 and $35,398)		37,300			38,076
Equity Securities (cost $1,281 and $1,244)		1,845			1,663
Other Invested Assets		1,756			1,954
TOTAL INVESTED ASSETS		42,903			44,221
Cash		67			50
Accrued Investment Income		427			424
Premiums Receivable		2,315			2,185
Reinsurance Recoverable on Unpaid Losses and Loss Expenses		1,833			1,941
Prepaid Reinsurance Premiums		344			337
Deferred Policy Acquisition Costs		1,262			1,206
Deferred Income Tax		162			—
Goodwill		467			467
Other Assets		1,460			1,353
TOTAL ASSETS	$	51,240		$	52,184
Liabilities
Unpaid Losses and Loss Expenses	$	23,531		$	23,963
Unearned Premiums		6,514			6,361
Long Term Debt		3,300			3,575
Dividend Payable to Shareholders		114			108
Deferred Income Tax		—			162
Accrued Expenses and Other Liabilities		2,258			2,188
TOTAL LIABILITIES		35,717			36,357
Shareholders’ Equity
Common Stock - $1 Par Value; 371,980,460 Shares		372			372
Paid-In Surplus		126			178
Retained Earnings		21,015			20,009
Accumulated Other Comprehensive Income		744			1,431
Treasury Stock, at Cost - 116,465,954 and 110,217,445 Shares		(6,734	)		(6,163	)
TOTAL SHAREHOLDERS’ EQUITY		15,523			15,827
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$	51,240		$	52,184

See Notes to Consolidated Financial Statements.

Page 4

THE CHUBB CORPORATION

CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY

SIX MONTHS ENDED JUNE 30

(in millions)

	2013			2012
Common Stock
Balance, Beginning of Year and End of Period	$	372		$	372
Paid-In-Surplus
Balance, Beginning of Year		178			190
Changes Related to Stock-Based Employee Compensation (includes tax benefit of $27 and $21)		(52	)		(47	)
Balance, End of Period		126			143
Retained Earnings
Balance, Beginning of Year		20,009			18,903
Net Income		1,235			910
Dividends Declared (per share $.88 and $.82)		(229	)		(222	)
Balance, End of Period		21,015			19,591
Accumulated Other Comprehensive Income
Unrealized Appreciation of Investments Including Unrealized Other-Than-Temporary Impairment Losses
Balance, Beginning of Year		2,013			1,736
Change During Period, Net of Tax		(696	)		123
Balance, End of Period		1,317			1,859
Foreign Currency Translation Gains
Balance, Beginning of Year		135			146
Change During Period, Net of Tax		(22	)		(37	)
Balance, End of Period		113			109
Postretirement Benefit Costs Not Yet Recognized in Net Income
Balance, Beginning of Year		(717	)		(687	)
Change During Period, Net of Tax		31			28
Balance, End of Period		(686	)		(659	)
Accumulated Other Comprehensive Income, End of Period		744			1,309
Treasury Stock, at Cost
Balance, Beginning of Year		(6,163	)		(5,359	)
Repurchase of Shares		(649	)		(606	)
Shares Issued Under Stock-Based Employee Compensation Plans		78			111
Balance, End of Period		(6,734	)		(5,854	)
TOTAL SHAREHOLDERS’ EQUITY	$	15,523		$	15,561

See Notes to Consolidated Financial Statements.

Page 5

THE CHUBB CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

SIX MONTHS ENDED JUNE 30

(in millions)

	2013			2012
Cash Flows from Operating Activities
Net Income	$	1,235		$	910
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Increase (Decrease) in Unpaid Losses and Loss Expenses, Net		(299	)		279
Increase in Unearned Premiums, Net		158			115
Increase in Premiums Receivable		(130	)		(118	)
Change in Income Tax Payable or Recoverable		27			(100	)
Amortization of Premiums and Discounts on Fixed Maturities		91			77
Depreciation		28			26
Realized Investment Gains, Net		(317	)		(103	)
Other, Net		(229	)		(200	)
Net Cash Provided by Operating Activities		564			886
Cash Flows from Investing Activities
Proceeds from Fixed Maturities
Sales		1,138			1,176
Maturities, Calls and Redemptions		2,353			1,946
Proceeds from Sales of Equity Securities		273			63
Purchases of Fixed Maturities		(4,053	)		(3,477	)
Purchases of Equity Securities		(92	)		(70	)
Investments in Other Invested Assets, Net		280			179
Decrease (Increase) in Short Term Investments, Net		514			(117	)
Change in Receivable or Payable from Security Transactions Not Settled, Net		165			221
Purchases of Property and Equipment, Net		(25	)		(21	)
Net Cash Provided by (Used In) Investing Activities		553			(100	)
Cash Flows from Financing Activities
Repayment of Long Term Debt		(275	)		—
Decrease in Funds Held Under Deposit Contracts		(4	)		(6	)
Proceeds from Issuance of Common Stock Under Stock-Based Employee Compensation Plans		36			60
Repurchase of Shares		(634	)		(618	)
Dividends Paid to Shareholders		(223	)		(219	)
Net Cash Used in Financing Activities		(1,100	)		(783	)
Net Increase in Cash		17			3
Cash at Beginning of Year		50			58
Cash at End of Period	$	67		$	61

See Notes to Consolidated Financial Statements.

Page 6

THE CHUBB CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1) General

The accompanying condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) and include the accounts of The Chubb Corporation (Chubb) and its subsidiaries (collectively, the Corporation). Significant intercompany transactions have been eliminated in consolidation.

The amounts included in this report are unaudited but include those adjustments, consisting of normal recurring items, that management considers necessary for a fair presentation. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes in the Notes to Consolidated Financial Statements included in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2012.

2) Invested Assets

(a) The amortized cost and fair value of fixed maturities and equity securities were as follows:

	June 30, 2013
	Amortized Cost		Gross Unrealized Appreciation		Gross Unrealized Depreciation		Fair Value
	(in millions)
Fixed maturities
Tax exempt	$	18,353	$	953	$	159	$	19,147
Taxable
U.S. government and government agency and authority obligations.		779		40		5		814
Corporate bonds		8,126		401		84		8,443
Foreign government and government agency obligations		6,813		270		21		7,062
Residential mortgage-backed securities		336		26		1		361
Commercial mortgage-backed securities		1,430		46		3		1,473
		17,484		783		114		18,153
Total fixed maturities	$	35,837	$	1,736	$	273	$	37,300
Equity securities	$	1,281	$	574	$	10	$	1,845

Page 7

	December 31, 2012
	Amortized Cost		Gross Unrealized Appreciation		Gross Unrealized Depreciation		Fair Value
	(in millions)
Fixed maturities
Tax exempt	$	18,410	$	1,522	$	19	$	19,913
Taxable
U.S. government and government agency and authority obligations		973		66		—		1,039
Corporate bonds		7,331		609		3		7,937
Foreign government and government agency obligations		6,614		395		1		7,008
Residential mortgage-backed securities		421		36		2		455
Commercial mortgage-backed securities		1,649		76		1		1,724
		16,988		1,182		7		18,163
Total fixed maturities	$	35,398	$	2,704	$	26	$	38,076
Equity securities	$	1,244	$	453	$	34	$	1,663

The fair value and amortized cost of fixed maturities at June 30, 2013 by contractual maturity were as follows:

	Fair Value		Amortized Cost
	(in millions)
Due in one year or less	$	2,192	$	2,161
Due after one year through five years		14,105		13,532
Due after five years through ten years		11,328		10,699
Due after ten years		7,841		7,679
		35,466		34,071
Residential mortgage-backed securities		361		336
Commercial mortgage-backed securities		1,473		1,430
	$	37,300	$	35,837

Actual maturities could differ from contractual maturities because borrowers may have the right to call or prepay obligations.

The Corporation’s equity securities comprise a diversified portfolio of primarily U.S. publicly-traded common stocks.

The Corporation is involved in the normal course of business with variable interest entities (VIEs) primarily as a passive investor in residential mortgage-backed securities, commercial mortgage-backed securities and private equity limited partnerships issued by third party VIEs. The Corporation is not the primary beneficiary of these VIEs. The Corporation’s maximum exposure to loss with respect to these investments is limited to the investment carrying values included in the Corporation’s consolidated balance sheet and any unfunded partnership commitments.

Page 8

(b) The components of unrealized appreciation or depreciation, including unrealized other-than-temporary impairment losses, of investments carried at fair value were as follows:

	June 30 2013		December 31 2012
	(in millions)
Fixed maturities
Gross unrealized appreciation	$	1,736	$	2,704
Gross unrealized depreciation		273		26
		1,463		2,678
Equity securities
Gross unrealized appreciation		574		453
Gross unrealized depreciation		10		34
		564		419
		2,027		3,097
Deferred income tax liability		710		1,084
	$	1,317	$	2,013

The following table summarizes, for all investment securities in an unrealized loss position at June 30, 2013, the aggregate fair value and gross unrealized depreciation, including unrealized other-than-temporary impairment losses, by investment category and length of time that individual securities have continuously been in an unrealized loss position.

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Depreciation		Fair Value		Gross Unrealized Depreciation		Fair Value		Gross Unrealized Depreciation
	(in millions)
Fixed maturities
Tax exempt	$	2,855	$	146	$	126	$	13	$	2,981	$	159
Taxable
U.S. government and government agency and authority obligations.		146		4		19		1		165		5
Corporate bonds		2,616		83		13		1		2,629		84
Foreign government and government agency obligations		1,440		20		9		1		1,449		21
Residential mortgage-backed securities		7		—		16		1		23		1
Commercial mortgage-backed securities		208		3		21		—		229		3
		4,417		110		78		4		4,495		114
Total fixed maturities		7,272		256		204		17		7,476		273
Equity securities		68		6		10		4		78		10
	$	7,340	$	262	$	214	$	21	$	7,554	$	283

Page 9

At June 30, 2013, approximately 1,120 individual fixed maturities and 10 individual equity securities were in an unrealized loss position. The Corporation does not have the intent to sell and it is not more likely than not that the Corporation will be required to sell these fixed maturities before the securities recover to their amortized cost value. In addition, the Corporation believes that none of the declines in the fair values of these fixed maturities relate to credit losses. The Corporation has the intent and ability to hold the equity securities in an unrealized loss position for a period of time sufficient to allow for the recovery of cost. The Corporation believes that none of the declines in the fair value of these fixed maturities and equity securities were other than temporary at June 30, 2013.

The following table summarizes, for all investment securities in an unrealized loss position at December 31, 2012, the aggregate fair value and gross unrealized depreciation, including unrealized other-than-temporary impairment losses, by investment category and length of time that individual securities have continuously been in an unrealized loss position.

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Depreciation		Fair Value		Gross Unrealized Depreciation		Fair Value		Gross Unrealized Depreciation
	(in millions)
Fixed maturities
Tax exempt	$	344	$	6	$	104	$	13	$	448	$	19
Taxable
U.S. government and government agency and authority obligations		28		—		20		—		48		—
Corporate bonds		289		2		14		1		303		3
Foreign government and government agency obligations		429		1		13		—		442		1
Residential mortgage-backed securities		1		—		19		2		20		2
Commercial mortgage-backed securities		105		1		3		—		108		1
		852		4		69		3		921		7
Total fixed maturities		1,196		10		173		16		1,369		26
Equity securities		182		21		63		13		245		34
	$	1,378	$	31	$	236	$	29	$	1,614	$	60

Page 10

The change in unrealized appreciation or depreciation of investments carried at fair value, including the change in unrealized other-than-temporary impairment losses, was as follows:

	Periods Ended June 30
	Second Quarter						Six Months
	2013			2012			2013			2012
	(in millions)
Change in unrealized appreciation of fixed maturities	$	(1,019	)	$	133		$	(1,215	)	$	116
Change in unrealized appreciation of equity securities		(57	)		(28	)		145			74
		(1,076	)		105			(1,070	)		190
Deferred income tax (credit)		(376	)		37			(374	)		67
	$	(700	)	$	68		$	(696	)	$	123

(c) Realized investment gains and losses were as follows:

	Periods Ended June 30
	Second Quarter						Six Months
	2013			2012			2013			2012
	(in millions)
Fixed maturities
Gross realized gains	$	14		$	24		$	27		$	62
Gross realized losses		(8	)		(7	)		(10	)		(10	)
Other-than-temporary impairment losses		—			(1	)		—			(2	)
		6			16			17			50
Equity securities
Gross realized gains		119			6			174			25
Other-than-temporary impairment losses		(5	)		(30	)		(7	)		(35	)
		114			(24	)		167			(10	)
Other invested assets		59			55			133			63
	$	179		$	47		$	317		$	103

(d) As of June 30, 2013 and December 31, 2012, fixed maturities still held by the Corporation for which a portion of their other-than-temporary impairment losses were recognized in other comprehensive income had cumulative credit-related losses of $21 million and $22 million, respectively, recognized in net income.

Page 11

3) Comprehensive Income

Comprehensive income is defined as all changes in shareholders’ equity, except those arising from transactions with shareholders. Comprehensive income includes net income and other comprehensive income or loss, which for the Corporation consists of changes in unrealized appreciation or depreciation of investments carried at fair value, changes in unrealized other-than-temporary impairment losses of fixed maturities, changes in foreign currency translation gains or losses and changes in postretirement benefit costs not yet recognized in net income.

The components of other comprehensive income or loss were as follows:

	Periods Ended June 30, 2013
	Second Quarter									Six Months
	Before Tax			Income Tax			Net of Tax			Before Tax			Income Tax			Net of Tax
	(in millions)
Net unrealized holding losses arising during the period	$	(956	)	$	(334	)	$	(622	)	$	(886	)	$	(310	)	$	(576	)
Reclassification adjustment for net realized gains included in net income		120			42			78			184			64			120
Net unrealized losses recognized in other comprehensive income or loss		(1,076	)		(376	)		(700	)		(1,070	)		(374	)		(696	)
Postretirement benefit costs not yet recognized in net income arising during the period		(1	)		(1	)		—			1			—			1
Reclassification adjustment for the amortization of net actuarial loss and prior service cost (a)		(23	)		(9	)		(14	)		(47	)		(17	)		(30	)
Net change in postretirement benefit costs not yet recognized in net income		22			8			14			48			17			31
Foreign currency translation gains (losses)		42			14			28			(35	)		(13	)		(22	)
Total other comprehensive loss	$	(1,012	)	$	(354	)	$	(658	)	$	(1,057	)	$	(370	)	$	(687	)

(a) Postretirement benefit costs recognized in net income during the period are included among several of the loss and expense components presented in the Consolidated Statement of Income.

Page 12

4) Segments Information

The principal business of the Corporation is the sale of property and casualty insurance. The profitability of the property and casualty insurance business depends on the results of both underwriting operations and investments, which are viewed as two distinct operations. The underwriting operations are managed and evaluated separately from the investment function.

The property and casualty insurance subsidiaries underwrite most lines of property and casualty insurance. Underwriting operations consist of four separate business units: personal insurance, commercial insurance, specialty insurance and reinsurance assumed. The personal segment targets the personal insurance market. The personal classes include automobile, homeowners and other personal coverages. The commercial segment includes those classes of business that are generally available in broad markets and are of a more commodity nature. Commercial classes include multiple peril, casualty, workers’ compensation and property and marine. The specialty segment includes those classes of business that are available in more limited markets since they require specialized underwriting and claim settlement. Specialty classes include professional liability coverages and surety. The reinsurance assumed business is in runoff following the transfer of the ongoing business to a reinsurance company in 2005.

Corporate and other includes investment income earned on corporate invested assets, corporate expenses and the results of the Corporation’s non-insurance subsidiaries.

Page 13

Revenues and income before income tax of each operating segment were as follows:

	Periods Ended June 30
	Second Quarter						Six Months
	2013			2012			2013			2012
	(in millions)
Revenues
Property and casualty insurance
Premiums earned
Personal insurance	$	1,050		$	1,014		$	2,081		$	2,004
Commercial insurance		1,299			1,305			2,607			2,591
Specialty insurance		645			664			1,311			1,336
Total insurance		2,994			2,983			5,999			5,931
Reinsurance assumed		1			—			—			3
		2,995			2,983			5,999			5,934
Investment income		361			381			724			772
Total property and casualty insurance		3,356			3,364			6,723			6,706
Corporate and other		16			12			28			24
Realized investment gains, net		179			47			317			103
Total revenues	$	3,551		$	3,423		$	7,068		$	6,833
Income (loss) before income tax
Property and casualty insurance
Underwriting
Personal insurance	$	75		$	58		$	225		$	219
Commercial insurance		124			18			319			69
Specialty insurance		96			65			191			131
Total insurance		295			141			735			419
Reinsurance assumed		6			8			10			19
		301			149			745			438
Increase in deferred policy acquisition costs		16			10			57			24
Underwriting income		317			159			802			462
Investment income		349			373			700			753
Other income		9			6			14			5
Total property and casualty insurance		675			538			1,516			1,220
Corporate and other		(58	)		(58	)		(121	)		(117	)
Realized investment gains, net		179			47			317			103
Total income before income tax	$	796		$	527		$	1,712		$	1,206

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5) Fair Values of Financial Instruments

Fair values of financial instruments are determined by management using valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. Fair values are generally measured using quoted prices in active markets for identical assets or liabilities or other inputs, such as quoted prices for similar assets or liabilities, that are observable either directly or indirectly. In those instances where observable inputs are not available, fair values are measured using unobservable inputs for the asset or liability. Unobservable inputs reflect the Corporation’s own assumptions about the assumptions that market participants would use in pricing the asset or liability and are developed based on the best information available in the circumstances. Fair value estimates derived from unobservable inputs are affected by the assumptions used, including the discount rates and the estimated amounts and timing of future cash flows. The derived fair value estimates cannot be substantiated by comparison to independent markets and are not necessarily indicative of the amounts that would be realized in a current market exchange. Certain financial instruments, particularly insurance contracts, are excluded from fair value disclosure requirements.

The methods and assumptions used to estimate the fair values of financial instruments are as follows:

(i) The carrying value of short term investments approximates fair value due to the short maturities of these investments.

(ii) Fair values for fixed maturities are determined by management, utilizing prices obtained from a third party, nationally recognized pricing service or, in the case of securities for which prices are not provided by a pricing service, from third party brokers. For fixed maturities that have quoted prices in active markets, market quotations are provided. For fixed maturities that do not trade on a daily basis, the pricing service and brokers provide fair value estimates using a variety of inputs including, but not limited to, benchmark yields, reported trades, broker/dealer quotes, issuer spreads, bids, offers, reference data, prepayment rates and measures of volatility. Management reviews on an ongoing basis the reasonableness of the methodologies used by the relevant pricing service and brokers. In addition, management, using the prices received for the securities from the pricing service and brokers, determines the aggregate portfolio price performance and reviews it against applicable indices. If management believes that significant discrepancies exist, it will discuss these with the relevant pricing service or broker to resolve the discrepancies.

(iii) Fair values of equity securities are determined by management, utilizing quoted market prices.

(iv) Fair values of warrants included in other invested assets are determined by management, utilizing an option pricing model.

(v) Fair values of long term debt issued by Chubb are determined by management, utilizing prices obtained from a third party, nationally recognized pricing service.

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The carrying values and fair values of financial instruments were as follows:

	June 30, 2013				December 31, 2012
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in millions)
Assets
Invested assets
Short term investments	$	2,002	$	2,002	$	2,528	$	2,528
Fixed maturities		37,300		37,300		38,076		38,076
Equity securities		1,845		1,845		1,663		1,663
Other invested assets		—		—		46		46
Liabilities
Long term debt		3,300		3,851		3,575		4,372

A pricing service provides fair value amounts for approximately 99% of the Corporation’s fixed maturities. The prices obtained from a pricing service and brokers generally are non-binding, but are reflective of current market transactions in the applicable financial instruments.

At June 30, 2013 and December 31, 2012, the Corporation held an insignificant amount of financial instruments in its investment portfolio for which a lack of market liquidity impacted the determination of fair value.

The fair value hierarchy prioritizes the inputs to valuation techniques used to measure fair value into three broad levels as follows:

Level 1 – Unadjusted quoted prices in active markets for identical financial instruments.

Level 2 – Other inputs that are observable for the financial instrument, either directly or indirectly.

Level 3 – Significant unobservable inputs.

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The fair value of financial instruments categorized based upon the lowest level of input that was significant to the fair value measurement was as follows:

	June 30, 2013
	Level 1		Level 2		Level 3		Total
	(in millions)
Assets
Short term investments	$	137	$	1,865	$	—	$	2,002
Fixed maturities
Tax exempt		—		19,142		5		19,147
Taxable
U.S. government and government agency and authority obligations		—		814		—		814
Corporate bonds		—		8,317		126		8,443
Foreign government and government agency obligations		—		7,052		10		7,062
Residential mortgage-backed securities		—		353		8		361
Commercial mortgage-backed securities		—		1,473		—		1,473
		—		18,009		144		18,153
Total fixed maturities		—		37,151		149		37,300
Equity securities		1,838		—		7		1,845
	$	1,975	$	39,016	$	156	$	41,147
Liabilities
Long term debt	$	—	$	3,851	$	—	$	3,851

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	December 31, 2012
	Level 1		Level 2		Level 3		Total
	(in millions)
Assets
Short term investments	$	182	$	2,346	$	—	$	2,528
Fixed maturities
Tax exempt		—		19,907		6		19,913
Taxable
U.S. government and government agency and authority obligations		—		1,039		—		1,039
Corporate bonds		—		7,779		158		7,937
Foreign government and government agency obligations		—		7,008		—		7,008
Residential mortgage-backed securities		—		446		9		455
Commercial mortgage-backed securities		—		1,724		—		1,724
		—		17,996		167		18,163
Total fixed maturities		—		37,903		173		38,076
Equity securities		1,655		—		8		1,663
Other invested assets		—		—		46		46
	$	1,837	$	40,249	$	227	$	42,313
Liabilities
Long term debt	$	—	$	4,372	$	—	$	4,372

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6) Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share:

	Periods Ended June 30
	Second Quarter				Six Months
	2013		2012		2013		2012
	(in millions, except for per share amounts)
Basic earnings per share:
Net income	$	579	$	404	$	1,235	$	910
Weighted average shares outstanding		260.5		271.5		261.9		272.9
Basic earnings per share	$	2.22	$	1.49	$	4.72	$	3.33
Diluted earnings per share:
Net income	$	579	$	404	$	1,235	$	910
Weighted average shares outstanding		260.5		271.5		261.9		272.9
Additional shares from assumed issuance of shares under stock- based compensation awards		1.0		1.8		1.3		1.9
Weighted average shares and potential shares assumed outstanding for computing diluted earnings per share		261.5		273.3		263.2		274.8
Diluted earnings per share	$	2.21	$	1.48	$	4.69	$	3.31

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Item 2 — Management’s Discussion and Analysis of Financial Condition and Results of Operations

Management’s Discussion and Analysis of Financial Condition and Results of Operations addresses the financial condition of the Corporation as of June 30, 2013 compared with December 31, 2012 and the results of operations for the six months and three months ended June 30, 2013 and 2012. This discussion should be read in conjunction with the condensed consolidated financial statements and related notes contained in this report and the consolidated financial statements and related notes and management’s discussion and analysis of financial condition and results of operations included in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2012.

Cautionary Statement Regarding Forward-Looking Information

Certain statements in this document are “forward-looking statements” as that term is defined in the Private Securities Litigation Reform Act of 1995 (PSLRA). These forward-looking statements are made pursuant to the safe harbor provisions of the PSLRA and include statements regarding market conditions in 2013, including premium volume, rate trends, the pricing environment and competition; the cost of our property reinsurance program in 2013; our loss reserve and reinsurance recoverable estimates; property and casualty investment income after taxes for the full year 2013; the repurchase of common stock under our share repurchase program; and our financial position, capital adequacy and funding of liquidity needs. Forward-looking statements frequently can be identified by words such as “believe,” “expect,” “anticipate,” “intend,” “plan,” “will,” “may,” “should,” “could,” “would,” “likely,” “estimate,” “predict,” “potential,” “continue,” or other similar expressions. Forward-looking statements are made based upon management’s current expectations and beliefs concerning trends and future developments and their potential effects on us. These statements are not guarantees of future performance. Actual results may differ materially from those suggested by forward-looking statements as a result of risks and uncertainties, which include, among others, those discussed or identified from time to time in our public filings with the Securities and Exchange Commission and those associated with:

• global political, economic and market conditions, particularly in the jurisdictions in which we operate and/or invest, including:

— changes in credit ratings, interest rates, market credit spreads and the performance of the financial markets;

— currency fluctuations;

— the effects of inflation;

— changes in domestic and foreign laws, regulations and taxes;

— changes in competition and pricing environments;

— regional or general changes in asset valuations;

— the inability to reinsure certain risks economically; and

— changes in the litigation environment;

• the effects of the outbreak or escalation of war or hostilities;

• the occurrence of terrorist attacks, including any nuclear, biological, chemical or radiological events;

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• premium pricing and profitability or growth estimates overall or by lines of business or geographic area, and related expectations with respect to the timing and terms of any required regulatory approvals;

• adverse changes in loss cost trends;

• our ability to retain existing business and attract new business at acceptable rates;

• our expectations with respect to cash flow and investment income and with respect to other income;

• the adequacy of our loss reserves, including:

— our expectations relating to reinsurance recoverables;

— the willingness of parties, including us, to settle disputes;

— developments in judicial decisions or regulatory or legislative actions relating to coverage and liability, in particular, for asbestos, toxic waste and other mass tort claims;

— development of new theories of liability;

— our estimates relating to ultimate asbestos liabilities; and

— the impact from the bankruptcy protection sought by various asbestos producers and other related businesses;

• the availability and cost of reinsurance coverage;

• the occurrence of significant weather-related or other natural or human-made disasters, particularly in locations where we have concentrations of risk or changes to our estimates (or the assessments of rating agencies and other third parties) of our potential exposure to such events;

• the impact of economic factors on companies on whose behalf we have issued surety bonds, and in particular, on those companies that file for bankruptcy or otherwise experience deterioration in creditworthiness;

• the effects of disclosures by, and investigations of, companies we insure, particularly with respect to our lines of business that have a longer time span, or tail, between the incidence of a loss and the settlement of the claim;

• the impact of legislative, regulatory, judicial and similar developments on companies we insure, particularly with respect to our longer tail lines of business;

• the impact of legislative, regulatory, judicial and similar developments on our business, including those relating to insurance industry reform, terrorism, catastrophes, the financial markets, solvency standards, capital requirements, accounting guidance and taxation;

• any downgrade in our claims-paying, financial strength or other credit ratings;

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• the ability of our subsidiaries to pay us dividends;

• our plans to repurchase shares of our common stock, including as a result of changes in:

— our financial position and financial results;

— our capital position and/or capital adequacy levels required to maintain our existing ratings from independent rating agencies;

— our share price;

— investment opportunities;

— opportunities to profitably grow our property and casualty insurance business;

— corporate and regulatory requirements; and

• our ability to implement management’s strategic plans and initiatives.

Chubb assumes no obligation to update any forward-looking information set forth in this document, which speak as of the date hereof.

Critical Accounting Estimates and Judgments

The consolidated financial statements include amounts based on informed estimates and judgments of management for transactions that are not yet complete. Such estimates and judgments affect the reported amounts in the financial statements. Those estimates and judgments that were most critical to the preparation of the financial statements involved the determination of loss reserves and the recoverability of related reinsurance recoverables and the evaluation of whether a decline in value of any investment is temporary or other than temporary. These estimates and judgments, which are discussed in Item 7 of our Annual Report on Form 10-K for the year ended December 31, 2012 as supplemented within the following analysis of our results of operations, require the use of assumptions about matters that are highly uncertain and therefore are subject to change as facts and circumstances develop. If different estimates and judgments had been applied, materially different amounts might have been reported in the financial statements.

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Overview

The following highlights do not address all of the matters covered in the other sections of Management’s Discussion and Analysis of Financial Condition and Results of Operations or contain all of the information that may be important to Chubb’s shareholders or the investing public. This overview should be read in conjunction with the other sections of Management’s Discussion and Analysis of Financial Condition and Results of Operations.

• Net income was $1.2 billion in the first six months of 2013 and $579 million in the second quarter compared with $910 million and $404 million, respectively in the same periods of 2012. Net income was higher in the first six months and second quarter of 2013 compared to the same periods of 2012 due to higher operating income and higher net realized investment gains. We define operating income as net income excluding realized investment gains and losses after tax.

• Operating income was $1.0 billion in the first six months of 2013 and $463 million in the second quarter compared with $843 million and $374 million, respectively, in the same periods of 2012. The higher operating income in the first six months and second quarter of 2013 was due to substantially higher underwriting income in our property and casualty insurance business. Property and casualty investment income decreased in both periods of 2013 compared with the same periods of 2012. Management uses operating income, a non-GAAP financial measure, among other measures, to evaluate its performance because the realization of investment gains and losses in any period could be discretionary as to timing and can fluctuate significantly, which could distort the analysis of operating trends.

• Underwriting results were highly profitable in the first six months and second quarter of 2013 compared with profitable results in the same periods of 2012. Our combined loss and expense ratio was 86.7% in the first six months of 2013 and 88.8% in the second quarter compared with 92.0% and 93.8% in the respective periods of 2012. Results were more profitable in the first six months and second quarter of 2013 due to a lower current accident year loss ratio excluding catastrophes and a higher amount of favorable prior year loss development. The impact of catastrophes accounted for 4.3 percentage points of the combined ratio in the first six months of 2013 and 7.9 percentage points in the second quarter compared with 4.2 and 7.5 percentage points, respectively, in the same periods of 2012.

• During the first six months and second quarter of 2013, we estimate that we experienced overall favorable prior year loss development of about $405 million and $215 million, respectively. We estimate that during the first six months and second quarter of 2012, we experienced overall favorable prior year loss development of about $265 million and $165 million, respectively. In each period we experienced favorable prior year loss development in each segment of our business.

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• Total net premiums written increased by 2% in the first six months of 2013 and were flat in the second quarter compared with the same periods of 2012. Net premiums written in the United States increased by 2% in the first six months of 2013 and 1% in the second quarter. Net premiums written outside the United States expressed in U.S. dollars increased by 2% in the first six months of 2013 and decreased by 3% in the second quarter. When measured in local currencies, such premiums increased modestly in the first six months of 2013 and decreased slightly in the second quarter.

• Property and casualty investment income after tax decreased by 6% in the first six months and second quarter of 2013 compared with the same periods of 2012 due to a decline in the average yield on our investment portfolio. Management uses property and casualty investment income after tax, a non-GAAP financial measure, to evaluate its investment results because it reflects the impact of any change in the proportion of tax exempt investment income to total investment income and is therefore more meaningful for analysis purposes than investment income before income tax.

• Net realized investment gains before tax were $317 million ($206 million after tax) in the first six months of 2013 and $179 million ($116 million after tax) in the second quarter compared with $103 million ($67 million after tax) and $47 million ($30 million after tax) in the same periods of 2012. In the first six months and second quarter of 2013, net realized investment gains included the recognition of a gain in connection with the merger of an issuer in which we held equity securities and warrants. The remaining net realized gains in the 2013 periods were primarily related to investments in limited partnerships, which generally are reported on a quarter lag, and sales of equity securities. The net realized gains in the first six months of 2012 were primarily related to investments in limited partnerships and sales of fixed maturity securities. The net realized gains in the second quarter of 2012 were primarily related to investments in limited partnerships.

A summary of our consolidated net income is as follows:

	Periods Ended June 30
	Six Months						Second Quarter
	2013			2012			2013			2012
	(in millions)
Property and casualty insurance	$	1,516		$	1,220		$	675		$	538
Corporate and other		(121	)		(117	)		(58	)		(58	)
Consolidated operating income before income tax		1,395			1,103			617			480
Federal and foreign income tax		366			260			154			106
Consolidated operating income		1,029			843			463			374
Realized investment gains after income tax		206			67			116			30
Consolidated net income	$	1,235		$	910		$	579		$	404

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Property and Casualty Insurance

A summary of the results of operations of our property and casualty insurance business is as follows:

	Periods Ended June 30
	Six Months						Second Quarter
	2013			2012			2013			2012
	(in millions)
Underwriting
Net premiums written	$	6,157		$	6,049		$	3,100		$	3,100
Increase in unearned premiums		(158	)		(115	)		(105	)		(117	)
Premiums earned		5,999			5,934			2,995			2,983
Losses and loss expenses		3,262			3,567			1,694			1,860
Operating costs and expenses		1,974			1,913			991			966
Increase in deferred policy acquisition costs		(57	)		(24	)		(16	)		(10	)
Dividends to policyholders		18			16			9			8
Underwriting income		802			462			317			159
Investments
Investment income before expenses		724			772			361			381
Investment expenses		24			19			12			8
Investment income		700			753			349			373
Other income		14			5			9			6
Property and casualty income before tax	$	1,516		$	1,220		$	675		$	538
Property and casualty investment income after tax	$	574		$	611		$	286		$	303

Property and casualty income before tax was higher in the first six months and second quarter of 2013 compared with the same periods of 2012. The higher income in the first six months and second quarter of 2013 was due to substantially higher underwriting income. The increase in underwriting income in the first six months and second quarter of 2013 compared with the same periods of 2012 was attributable to a lower current accident year loss ratio excluding catastrophes and a higher amount of favorable prior year loss development. The impact of catastrophes was similar in the first six months and second quarter of both years. Investment income decreased in the first six months and second quarter of 2013 compared with the same periods of 2012, due to a decline in the average yield on our investment portfolio.

The profitability of our property and casualty insurance business depends on the results of both our underwriting and investment operations. We view these as two distinct operations since the underwriting functions are managed separately from the investment function. Accordingly, in assessing our performance, we evaluate underwriting results separately from investment results.

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Underwriting Results

We evaluate the underwriting results of our property and casualty insurance business in the aggregate and also for each of our separate business units.

Net Premiums Written

Net premiums written were $6.2 billion in the first six months of 2013 compared with $6.0 billion in the same period of 2012. Net premiums written were $3.1 billion in the second quarter of both years. Net premiums written by business unit were as follows:

	Six Months Ended June 30								Quarter Ended June 30				% Incr. (Decr.)
	2013			2012		% Incr.			2013		2012
	(in millions)								(in millions)
Personal insurance	$	2,141		$	2,049		4	%	$	1,154	$	1,109		4	%
Commercial insurance		2,759			2,758		—			1,319		1,353		(3	)
Specialty insurance		1,258			1,240		1			626		638		(2	)
Total insurance		6,158			6,047		2			3,099		3,100		—
Reinsurance assumed		(1	)		2		*			1		—		*
Total	$	6,157		$	6,049		2		$	3,100	$	3,100		—

* The change in net premiums written is not presented since the business is in runoff.

Net premiums written increased by 2% in the first six months of 2013 and were flat in the second quarter compared with the same periods of 2012. Net premiums written in the United States, which represented 74% of our total net premiums written in the first six months of 2013, increased by 2% in the first six months of 2013 and 1% in the second quarter. Net premiums written outside the United States, expressed in U.S. dollars, increased by 2% in the first six months of 2013 and decreased by 3% in the second quarter. When measured in local currencies, net premiums written outside the United States increased modestly in the first six months of 2013 and decreased slightly in the second quarter.

We classify business as written in the United States or outside the United States based on the location of the risk associated with the underlying policies. The method of determining location of risk varies by class of business. Location of risk for property classes is typically based on the physical location of the covered property, while location of risk for liability classes may be based on the main location of the insured, or in the case of the workers’ compensation class, the primary work location of the covered employee.

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Growth in net premiums written in the United States in the first six months and second quarter of 2013 was driven by growth in our personal insurance segment. Net premiums written in the United States were near flat in the first six months of 2013 and decreased slightly in the second quarter in both our commercial insurance and specialty insurance segments. Growth in our personal insurance business in both periods of 2013 was attributable to new business, strong retention of existing business as well as higher rates and insured exposures upon renewal. Growth in our commercial insurance segment and our professional liability insurance business, which is the predominant component of our specialty insurance segment, while reflecting higher rates and continued strong retention, remained constrained by our underwriting actions and judicious approach to new business in the highly competitive market in both the first six months and second quarter of 2013.

Average renewal rates for our personal insurance business in the United States were up modestly in the first six months and second quarter of 2013, driven particularly by our homeowners business. Average renewal rates in the first six months and second quarter of 2013 in the United States were up significantly in both our commercial and professional liability businesses in comparison to expiring rates. The amounts of coverage purchased or the insured exposures, both of which are bases upon which we calculate the premiums we charge, were down slightly in the first six months and second quarter of 2013 compared to the same periods in 2012 in our commercial insurance and our professional liability businesses. We continued to retain a high percentage of our existing commercial and professional liability business. Renewal retention levels in the first six months of 2013 were similar in our commercial insurance business and slightly lower in our professional liability business compared to those in the same period of 2012. As part of our ongoing catastrophe management activities, during the first six months of 2013 we non-renewed or reduced our participation in some commercial accounts that had catastrophe-related exposure. Retention levels in the second quarter of 2013 were slightly lower in our commercial insurance business and slightly higher in our professional liability business than those in the same period of 2012. During the first six months of 2013, we have continued to seek renewal rate increases in most of the classes within these businesses and to take underwriting actions to improve profitability, particularly in some of the professional liability classes. The overall level of new business in the United States in our commercial and professional liability businesses was down in the first six months and second quarter of 2013 compared with the same periods of 2012, reflecting both the competitive market as well as our underwriting discipline.

Outside the United States, growth in net premiums written in the first six months of 2013 was driven by modest growth in our personal insurance and specialty insurance segments. Net premiums written in our commercial insurance segment outside the United States were flat in the first six months of 2013. In the second quarter of 2013, the overall decrease in net premiums written outside the United States was driven by decreases in both our commercial insurance and specialty insurance segments. Net premiums written in our personal insurance segment grew slightly in the second quarter of 2013. Overall growth in net premiums written outside the United States in the first six months and second quarter of 2013 reflected a slight negative impact from foreign currency translation.

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Growth in our personal insurance business outside the United States in the first six months and second quarter of 2013 reflected modest increases in average renewal rates. Average renewal rates outside the United States were up modestly in our commercial insurance business in the first six months of 2013 but up only slightly in the second quarter. Average renewal rates in our professional liability business were up slightly in both periods of 2013. Retention levels for our commercial insurance business and professional liability business written outside the United States in the first six months and second quarter of 2013 were slightly lower than those in the same periods of 2012. For our commercial insurance business, the level of new business written outside the United States was slightly lower in the first six months of 2013 and nearly unchanged in the second quarter compared to that in the respective periods of 2012. The level of new business written outside the United States for our professional liability business was slightly lower in both periods of 2013 compared to that in the same periods of 2012.

We expect our net written premiums for the full year 2013 will increase at a rate similar to the rate in the first half of the year, including a slight negative impact from foreign currency translation, assuming average foreign currency to U.S. dollar exchange rates for the remainder of the year remain similar to June 30, 2013 levels. We expect that market conditions will remain competitive but that the positive pricing environment, particularly in the United States, will continue during the remainder of 2013.

Reinsurance Ceded

Our premiums written are net of amounts ceded to reinsurers who assume a portion of the risk under the insurance policies we write that are subject to reinsurance.

The most significant component of our ceded reinsurance program is property reinsurance. We purchase two main types of property reinsurance: catastrophe and property per risk.

For property risks in the United States and Canada, we purchase traditional catastrophe reinsurance, including our primary treaty which we refer to as our North American catastrophe treaty, as well as supplemental catastrophe reinsurance that provides additional coverage for our exposures in the northeast United States. For certain exposures in the United States, we have also arranged for the purchase of multi–year, collateralized reinsurance funded through the issuance of collateralized risk-linked securities, known as catastrophe bonds. For events outside the United States, we also purchase traditional catastrophe reinsurance.

We renewed our primary traditional property catastrophe treaties and our commercial property per risk treaty in April 2013 with no changes in coverage. A portion of the supplemental catastrophe reinsurance that provides coverage for our exposures in the northeast United States was renewed in June 2013 with no changes in coverage. The remaining portion is in effect until June 2014. The two catastrophe bond arrangements currently in place expire in years subsequent to 2013.

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The North American catastrophe treaty has an initial retention of $500 million and provides coverage for exposures in the United States and Canada of approximately 34% of losses (net of recoveries from other available reinsurance) between $500 million and $900 million and approximately 72% of losses (net of recoveries) between $900 million and $1.65 billion. For certain catastrophic events in the northeast United States or along the southern U.S. coastline, the combination of the North American catastrophe treaty, supplemental catastrophe reinsurance and/or the catastrophe bond arrangements provide additional coverages as discussed below.

The catastrophe bond arrangements provide reinsurance coverage for specific types of losses in specific geographic locations. They are generally designed to supplement coverage provided under the North American catastrophe treaty. We currently have two catastrophe bond arrangements in effect. We have a $475 million reinsurance arrangement, a portion of which expires in March 2014 and the remainder in March 2015, that provides coverage for our exposure to homeowners and commercial losses related to certain hurricane, earthquake, severe thunderstorm and winter storm loss events in twelve states in the northeast United States and the District of Columbia. We also have a $150 million reinsurance arrangement that expires in March 2016 that provides coverage for homeowners-related hurricane and severe thunderstorm losses in eight states along the southern U.S. coastline.

For the indicated catastrophic events in the northeast United States, the combination of the North American catastrophe treaty, the supplemental catastrophe reinsurance and the $475 million catastrophe bond arrangement provides additional coverage of approximately 65% of losses (net of recoveries from other available reinsurance) between $1.65 billion and $3.65 billion.

For hurricane and severe thunderstorm events along the southern U.S. coastline, the $150 million catastrophe bond arrangement provides additional coverage of approximately 50% of homeowners-related hurricane and severe thunderstorm losses (net of recoveries from other available reinsurance) between $860 million and $1.16 billion.

For hurricane events in Florida, in addition to the coverage provided by the North American catastrophe treaty and the $150 million catastrophe bond arrangement discussed above, we have reinsurance from the Florida Hurricane Catastrophe Fund (FHCF), which is a state-mandated fund designed to reimburse insurers for a portion of their residential catastrophic hurricane losses. Our participation in this mandatory program limits our initial retention in Florida for homeowners-related losses to approximately $165 million and provides coverage of 90% of covered losses between approximately $165 million and $600 million.

Our primary property catastrophe treaty for events outside the United States, including Canada, provides coverage of approximately 75% of losses (net of recoveries from other available reinsurance) between $100 million and $350 million. For catastrophic events in Australia and Canada, additional reinsurance provides coverage of 80% of losses (net of recoveries from other available reinsurance) between $350 million and $475 million.

Our commercial property per risk treaty provides coverage per risk of approximately $600 million to $800 million (depending upon the currency in which the insurance policy was issued) in excess of our initial retention. Our initial retention is generally between $25 million and $35 million.

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In addition to our major property catastrophe and property per risk treaties, we purchase several smaller property treaties that only cover specific classes of business or locations having concentrations of risk.

Recoveries under our property reinsurance treaties are subject to certain coinsurance requirements that affect the interaction of some elements of our reinsurance program.

Our property reinsurance treaties generally contain terrorism exclusions for acts perpetrated by foreign terrorists, and for nuclear, biological, chemical and radiological loss causes whether such acts are perpetrated by foreign or domestic terrorists.

For the North American catastrophe treaty, we incurred a slight increase in cost upon renewal. However, the renewal costs associated with the catastrophe treaty that covers events outside the United States and the commercial property per risk treaty were lower. We expect that the overall cost of our property reinsurance program will be modestly lower in 2013 than in 2012.

Profitability

The combined loss and expense ratio (or combined ratio), expressed as a percentage, is the key measure of underwriting profitability traditionally used in the property and casualty insurance business. Management evaluates the performance of our underwriting operations and of each of our business units using, among other measures, the combined loss and expense ratio calculated in accordance with statutory accounting principles. It is the sum of the ratio of losses and loss expenses to premiums earned (loss ratio) plus the ratio of statutory underwriting expenses to premiums written (expense ratio) after reducing both premium amounts by dividends to policyholders. When the combined ratio is under 100%, underwriting results are generally considered profitable; when the combined ratio is over 100%, underwriting results are generally considered unprofitable.

Statutory accounting principles applicable to property and casualty insurance companies differ in certain respects from generally accepted accounting principles (GAAP). Under statutory accounting principles, policy acquisition and other underwriting expenses are recognized immediately, not at the time premiums are earned. Management uses underwriting results determined in accordance with GAAP, among other measures, to assess the overall performance of our underwriting operations. To convert statutory underwriting results to a GAAP basis, certain policy acquisition expenses are deferred and amortized over the period in which the related premiums are earned. Underwriting income determined in accordance with GAAP is defined as premiums earned less losses and loss expenses incurred and GAAP underwriting expenses incurred.

An accident year is the calendar year in which a loss is incurred or, in the case of claims-made policies, the calendar year in which a loss is reported. The total losses and loss expenses incurred for a particular calendar year include current accident year losses and loss expenses as well as any increases or decreases to our estimates of losses and loss expenses that occurred in all prior accident years, which we refer to as prior year loss development.

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Underwriting results were highly profitable in the first six months and second quarter of 2013 compared with profitable results in the same periods of 2012. The combined loss and expense ratio for our overall property and casualty business was as follows:

	Periods Ended June 30
	Six Months						Second Quarter
	2013			2012			2013			2012
Loss ratio		54.5	%		60.3	%		56.7	%		62.5	%
Expense ratio		32.2			31.7			32.1			31.3
Combined ratio		86.7	%		92.0	%		88.8	%		93.8	%

The loss ratio was significantly lower in the first six months and second quarter of 2013 compared with the same periods of 2012 due to a lower current accident year loss ratio excluding catastrophes and a higher amount of favorable prior year loss development. The current accident year loss ratio excluding catastrophes was lower in the first six months and second quarter of 2013 compared with the same period of 2012 in each of our three insurance business segments. The overall loss ratio excluding catastrophes in the first six months and second quarter of both years reflected favorable loss experience that we believe resulted from our disciplined underwriting in recent years as well as relatively moderate loss trends and the positive impact on earned premiums of rate increases in most classes of business.

The overall impact of catastrophes in the first six months of 2013 was $255 million, which represented 4.3 percentage points of the combined ratio. This compares with an impact of catastrophes in the first six months of 2012 of $247 million, which represented 4.2 percentage points of the combined ratio. The impact of catastrophes in the second quarter of 2013 was $237 million, which represented 7.9 percentage points of the combined ratio. This compares with an impact of catastrophes in the second quarter of 2012 of $223 million, which represented 7.5 percentage points of the combined ratio. A significant portion of the catastrophe losses in the first six months of 2013 related to several severe storms in the central United States, as well as flooding in southern Alberta, Canada, primarily in the second quarter. A significant portion of the catastrophe losses in the first six months of 2012 related to several severe hail and wind storms in the United States, primarily in the second quarter. Our overall estimate of gross and net losses related to the Storm Sandy event in 2012 did not change during the first six months of 2013, although in the first quarter the estimate related to our commercial insurance business decreased slightly and the estimate related to our personal insurance business increased by the same amount.

The expense ratio was higher in the first six months and second quarter of 2013 compared with the same periods of 2012. The higher ratio in the first six months of 2013 was due mainly to higher commissions, primarily in the United States, as well as higher taxes. The higher ratio in the second quarter of 2013 was due to overhead expenses increasing at a greater rate than the rate of growth of premiums written and, to a lesser extent, higher taxes.

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Review of Underwriting Results by Business Unit

Personal Insurance

Net premiums written from personal insurance, which represented 35% of our premiums written in the first six months of 2013, increased by 4% in the first six months and second quarter of 2013 compared with the same periods of 2012. Net premiums written for the classes of business within the personal insurance segment were as follows:

	Six Months Ended June  30							Quarter Ended June 30
	2013		2012		% Incr.			2013		2012		% Incr.
	(in millions)							(in millions)
Automobile	$	371	$	349		6	%	$	195	$	185		5	%
Homeowners		1,304		1,261		3			734		706		4
Other		466		439		6			225		218		3
Total personal	$	2,141	$	2,049		4		$	1,154	$	1,109		4

Growth in net premiums written in our personal insurance business in the first six months and second quarter of 2013 occurred in all classes of this business. Overall, net premiums written in our personal insurance business grew in the first six months and second quarter of 2013 both inside and outside the United States, but more so in the United States. Growth in net premiums written outside the United States was adversely impacted in both periods by foreign currency translation. Growth in our personal insurance business was attributable to new business, strong retention of existing business as well as higher rates and insured exposures upon renewal. Growth in personal automobile premiums in the first six months and second quarter of 2013 occurred both inside and outside the United States. Personal automobile premiums written outside the United States represent about 40% of our worldwide automobile business annually. Premiums in our homeowners business increased modestly in the first six months and second quarter of 2013 compared with the same periods of 2012, driven by growth in the United States, reflecting increases in coverage on existing policies and higher renewal rates. Homeowners premiums outside the United States decreased modestly in the first six months and second quarter of 2013 compared to the same periods of 2012, due in part to the negative impact of foreign currency translation. Premiums from our other personal business, which includes accident and health, excess liability and yacht coverages, increased in the first six months and second quarter of 2013 compared with the same periods of 2012, both inside and outside the United States. Our accident and health business grew modestly in the first six months of 2013 but was flat in the second quarter. Growth in our accident and health business in the first six months of 2013 occurred both inside and outside the United States. Our excess liability business grew modestly in both periods.

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Our personal insurance business produced highly profitable underwriting results in the first six months and second quarter of both 2013 and 2012. The combined loss and expense ratios for the classes of business within the personal insurance segment were as follows:

	Periods Ended June 30
	Six Months						Second Quarter
	2013			2012			2013			2012
Automobile		94.7	%		92.2	%		95.3	%		93.2	%
Homeowners		84.5			85.0			86.9			90.3
Other		93.6			94.8			93.3			92.6
Total personal		88.2			88.3			89.6			91.2

The slightly more profitable underwriting results for our personal insurance business in the second quarter of 2013 compared with the same period of 2012 were driven by better results in our homeowners business, primarily due to a lower current accident year loss ratio excluding catastrophes. The impact of catastrophes represented 8.3 percentage points of the combined ratio for our personal insurance business in the first six months of 2013 and 12.7 percentage points in the second quarter compared with 6.4 and 11.5 percentage points, respectively, in the same periods of 2012. Of the 8.3 percentage points impact of catastrophes in the first six months of 2013, 1.3 percentage points related to an increase in the first quarter in estimated losses from Storm Sandy.

Our personal automobile business produced profitable results in the first six months and second quarter of 2013 and 2012, but more so in 2012. Results in all periods benefited from favorable prior year loss development.

Homeowners results were highly profitable in the first six months of both 2013 and 2012. Results were also highly profitable in the second quarter of both years, but more so in 2013. The more profitable results in the second quarter of 2013 were due in large part to a lower current accident year combined ratio excluding catastrophes, partly reflecting a low level of non-catastrophe fire-related losses. Catastrophe losses represented 13.1 percentage points of the combined ratio for this class in the first six months of 2013 and 20.1 percentage points in the second quarter compared with 10.0 and 18.0 percentage points, respectively, in the same periods of 2012.

Our other personal business produced similarly profitable results in the first six months and second quarter of 2013 and 2012. Our accident and health business produced slightly profitable results in the first six months and the second quarter of 2013 and 2012. Our personal excess liability business produced profitable results in the first six months and second quarter of 2013 and 2012, but slightly more so in the 2013 periods. Results for our personal excess liability business in all periods reflected favorable prior year loss development. Our yacht business produced highly profitable results in the first six months and second quarter of both years, but more so in the 2013 periods.

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Commercial Insurance

Net premiums written from commercial insurance, which represented 45% of our premiums written in the first six months of 2013, were flat in the first six months of 2013 and decreased by 3% in the second quarter compared with the same periods of 2012. Net premiums written for the classes of business within the commercial insurance segment were as follows:

	Six Months Ended June 30				% Incr. (Decr.)			Quarter Ended June 30				% Incr. (Decr.)
	2013		2012					2013		2012
	(in millions)							(in millions)
Multiple peril	$	549	$	553		(1	)%	$	277	$	292		(5	)%
Casualty		850		870		(2	)		402		420		(4	)
Workers’ compensation		565		547		3			266		249		7
Property and marine		795		788		1			374		392		(5	)
Total commercial	$	2,759	$	2,758		—		$	1,319	$	1,353		(3	)

Net premiums written in our commercial insurance business in the first six months of 2013 were flat both inside and outside the United States. The decrease in net premiums written in the second quarter of 2013 occurred both inside and outside the United States, but to a greater extent outside the United States. Overall, the lack of premium growth for our commercial insurance business in both periods of 2013 reflected lower renewal exposures and somewhat lower, yet strong, retention levels in a market that continued to be highly competitive. The positive overall rate environment in the United States we experienced in 2012 continued in the first six months of 2013. Overall, average renewal rates in the United States increased significantly in the first six months and second quarter of 2013 for our commercial insurance business, with increases occurring in all major classes. Improvement in the rate environment outside the United States has generally been slower and continued to lag the improvement in the United States. Overall, average renewal rates outside the United States were modestly higher in the first six months and slightly higher in the second quarter of 2013. Retention levels of our existing policyholders remained strong, particularly in the United States, even though we continued our effort to increase rates in several classes of business and we non-renewed some underperforming or catastrophe-exposed accounts. Retention was down slightly in the first six months and second quarter of 2013 compared to the same periods of 2012, both inside and outside the United States. In the first six months and second quarter of 2013, the average renewal exposure change was down slightly both inside and outside the United States. The amount of new business was down in the first six months and second quarter of 2013 compared with the same period in 2012, driven by a decline in the United States, as we continued to maintain our underwriting discipline in the competitive market. Outside the United States, new business was down slightly in the first six months of 2013 and flat in the second quarter.

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Our commercial insurance business produced highly profitable underwriting results in the first six months and second quarter of 2013 compared with profitable results in the same periods of 2012. The combined loss and expense ratios for the classes of business within the commercial insurance segment were as follows:

	Periods Ended June 30
	Six Months						Second Quarter
	2013			2012			2013			2012
Multiple peril		88.9	%		97.0	%		94.4	%		100.9	%
Casualty		94.0			92.9			94.8			92.1
Workers’ compensation		87.7			95.4			86.6			95.8
Property and marine		73.6			97.8			83.0			102.0
Total commercial		85.9			95.4			89.9			97.5

The more profitable results in our commercial insurance business in the first six months of 2013 compared with the same period of 2012 were due to both a higher amount of favorable prior year loss development and a lower current accident year combined ratio excluding catastrophes. The more profitable results in the second quarter of 2013 compared with the same period of 2012 were primarily due to a lower current accident year combined ratio excluding catastrophes and, to a lesser extent, a higher amount of favorable prior year loss development. The impact of catastrophes represented 3.2 percentage points of the combined ratio for our commercial insurance business in the first six months of 2013 and 8.1 percentage points in the second quarter compared with 4.6 and 8.2 percentage points, respectively, in the same periods of 2012. The 3.2 percentage points impact of catastrophes in the first six months of 2013 reflected a favorable impact of 1.0 percentage point related to a decrease in the first quarter in estimated losses from Storm Sandy. Results in all periods benefited from our disciplined risk selection in recent years.

Multiple peril results were highly profitable in the first six months of 2013 compared with profitable results in the same period of 2012. Results in the second quarter of 2013 were profitable compared with near breakeven results in the same period of 2012. The more profitable results in the 2013 periods were due to improvement in both the property and liability components of this business. The property component of this business produced profitable results in the first six months of both years and the second quarter of 2013. Results for the property component of this business were modestly unprofitable in the second quarter of 2012. The improvement in the results for the property component in both periods was due to a lower impact of catastrophes as well as a higher amount of favorable prior year loss development, offset in part by a higher current accident year combined ratio excluding catastrophes, which was partly due to a higher expense ratio. The liability component of this business produced profitable results in the first six months and second quarter of both years, but more so in 2013, due to a higher amount of favorable prior year loss development and improved current accident year results. In the multiple peril class overall, the impact of catastrophes represented 5.0 percentage points of the combined ratio in the first six months of 2013 and 10.8 percentage points in the second quarter compared with 9.2 and 14.0 percentage points, respectively, in the same periods of 2012.

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Results for our casualty business were profitable in the first six months and second quarter of 2013 and 2012, but more so in the 2012 periods. Results for the primary liability component were unprofitable in the first six months and second quarter of 2013 and 2012. Results for this component in each period reflected a high volume of large reported losses, many of which related to prior accident years. The automobile component of our casualty business produced profitable results in the first six months of 2013 and highly profitable results in the second quarter compared with modestly unprofitable results in the same periods of 2012. Results in the 2013 periods benefited from favorable prior year loss development. Results for the excess liability component were highly profitable in the first six months and second quarter of both 2013 and 2012. Results in all periods benefited from substantial favorable prior year loss development. Results for our casualty business were adversely affected by incurred losses related to toxic waste and asbestos claims in the first six months and second quarter of both years. Our analysis of these exposures resulted in increases in the estimate of our ultimate liabilities. Such losses represented 4.0 and 1.5 percentage points of the combined ratio for this business in the first six months of 2013 and 2012, respectively, and 4.4 and 1.7 percentage points in the second quarter of 2013 and 2012, respectively.

Workers’ compensation results were highly profitable in the first six months and second quarter of 2013 compared with profitable results in the same periods of 2012. The more profitable results in the 2013 periods were mainly due to improved current accident year results compared with the same periods of 2012. Results in the first six months and second quarter of both years, but more so in 2013, also reflected favorable prior year loss development. Results in both years benefited from our disciplined risk selection during the past several years.

Property and marine results were highly profitable in the first six months of 2013 compared with modestly profitable results in the same period of 2012. Results were also highly profitable in the second quarter of 2013 compared with modestly unprofitable results in the same period of 2012. Results in the 2013 periods benefited from a low current accident year combined ratio excluding catastrophes, reflecting the low volume of large losses. Results in the 2013 periods also reflected a significant amount of favorable prior year loss development, partly due to a much lower than expected impact from large non-catastrophe losses. Results in the first six months of 2012 reflected a modest amount of unfavorable prior year loss development. Results in the second quarter of 2012 reflected a modest amount of favorable prior year loss development. The impact of catastrophe losses represented 6.7 percentage points of the combined ratio for this class in the first six months of 2013 and 19.9 percentage points in the second quarter compared with 8.2 and 16.6 percentage points, respectively, in the same periods of 2012.

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Specialty Insurance

Net premiums written from specialty insurance, which represented 20% of our premiums written in the first six months of 2013, increased by 1% in the first six months of 2013 and decreased by 2% in the second quarter compared with the same periods of 2012. Net premiums written for the classes of business within the specialty insurance segment were as follows:

	Six Months Ended June 30							Quarter Ended June 30
	2013		2012		% Incr.			2013		2012		% Decr.
	(in millions)							(in millions)
Professional liability	$	1,098	$	1,093		—	%	$	549	$	555		(1	)%
Surety		160		147		9			77		83		(7	)
Total specialty	$	1,258	$	1,240		1		$	626	$	638		(2	)

Net premiums written in our professional liability business were flat in the first six months of 2013 and decreased slightly in the second quarter compared with the same periods of 2012. Net premiums written in the United States were near flat in the first six months and second quarter of 2013, while net premiums written outside the United States were modestly higher in the first six months but modestly lower in the second quarter. Premium growth in the professional liability business remained constrained as we continued our focus on profitability in the pricing of renewal policies and due to the lack of opportunities to write suitably-priced new business, in what remains a highly competitive marketplace. Nevertheless, the overall rate environment remained positive, particularly in the United States. We continued to pursue rate increases on our professional liability business to address margin compression experienced in these classes of business in recent years. Retention levels for the classes within our professional liability business remained strong, with only a slight decline in the first six months of 2013 compared with the same period of 2012, both inside and outside the United States. Retention levels were slightly higher in the second quarter of 2013 compared with those in the same period of 2012, driven by the United States. New business volume was down in the first six months and second quarter of 2013 compared with the same periods of 2012, both inside and outside the United States. The decline in the U.S. retention levels and new business volume in the first six months of 2013 was consistent with our desire to selectively reduce our exposure in some customer segments where current rate levels are not attractive, as well as our commitment to maintaining underwriting discipline in this environment. Average renewal rates for our professional liability business in the United States increased significantly in the first six months and second quarter of 2013 compared with the same periods of 2012. Rate increases occurred in all major classes of this business, particularly in our directors and officers liability and employment practices liability classes of business. Overall, renewal rates outside the United States were up modestly in the first six months and second quarter of 2013 compared with the same periods of 2012.

Net premiums written in our surety business increased both inside and outside the United States in the first six months of 2013 but decreased in the second quarter compared with the same periods of 2012. The timing of contract awards to our customers can vary and, as a result, premium growth in our surety business varies from period to period. The growth in premiums written in our surety business outside the United States in the first six months of 2013 was driven by growth in Latin America.

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Our specialty insurance business produced highly profitable underwriting results in the first six months and second quarter of 2013 compared with profitable results in the same periods of 2012. The combined loss and expense ratios for the classes of business within the specialty insurance segment were as follows:

	Periods Ended June 30
	Six Months						Second Quarter
	2013			2012			2013			2012
Professional liability		92.1	%		98.2	%		91.9	%		97.9	%
Surety		46.6			49.1			42.1			42.8
Total specialty		86.7			92.5			86.0			91.4

Our professional liability business produced profitable results in the first six months and second quarter of 2013 compared with modestly profitable results in the same periods of 2012. The more profitable results in the 2013 periods were due to a lower current accident year combined ratio and a higher amount of favorable prior year loss development compared to the same periods of 2012.

Results for the directors and officers liability class were highly profitable in the first six months of 2013 compared with profitable results in the same period of 2012. Results were highly profitable in the second quarter of both years, but more so in 2013. Results in all periods benefited from favorable prior year loss development, but more so in the 2013 periods. Results for the fidelity class were modestly unprofitable in the first six months of 2013 compared with modestly profitable results in the same period of 2012. Results were unprofitable in the second quarter of 2013 compared with near breakeven results in the same period of 2012. Results for the fidelity class in the first six months and second quarter of 2013 were adversely affected by unfavorable prior year loss development. Results for the employment practices liability class were highly unprofitable in the first six months and second quarter of both years, but more so in 2013 primarily due to a higher amount of unfavorable prior year loss development. Employment practices liability claims have been more numerous and protracted in recent years due primarily to the effect of the economic downturn and higher unemployment levels during that time. Results for the errors and omissions liability class were unprofitable in the first six months of 2013 compared with highly unprofitable results in the same period of 2012. Results were highly unprofitable in the second quarter of both years. Results in the first six months of 2012 and the second quarter of both 2013 and 2012 reflected unfavorable prior year loss development. Results for the fiduciary liability class were highly profitable in the first six months and second quarter of both 2013 and 2012; results in all periods reflected favorable prior year loss development.

Our surety business produced highly profitable results in the first six months and second quarter of both 2013 and 2012 due to favorable loss experience. Our surety business tends to be characterized by losses that are infrequent but have the potential to be highly severe.

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Reinsurance Assumed

Net premiums written from our reinsurance assumed business, which is in runoff, were not significant in the first six months and second quarter of 2013 and 2012.

Reinsurance assumed results were profitable in the first six months and second quarter of 2013 and 2012. Results in all periods benefited from favorable prior year loss development.

    Catastrophe Risk Management

Our property and casualty subsidiaries have exposure to losses caused by natural perils such as hurricanes and other windstorms, earthquakes, severe winter weather and brush fires as well as from man-made catastrophic events such as terrorism. The frequency and severity of catastrophes are inherently unpredictable.

The extent of losses from a catastrophe is a function of both the total amount of insured exposure in an area affected by the event and the severity of the event. We regularly assess our concentrations of risk in catastrophe exposed areas globally and have strategies and underwriting standards to manage these exposures through individual risk selection, subject to regulatory constraints, and through the purchase of catastrophe reinsurance coverage. We use catastrophe modeling and a risk concentration management tool to monitor and control our accumulations of potential losses in catastrophe exposed areas in the United States, such as California and the gulf and east coasts, as well as in catastrophe exposed areas in other countries. The information provided by the catastrophe modeling and the risk concentration management tool has resulted in our non-renewing some accounts and refraining from writing others.

Catastrophe modeling generally relies on multiple inputs based on experience, science, engineering and history, and the selection of those inputs requires a significant amount of judgment. The modeling results may also fail to account for risks that are outside the range of normal probability or are otherwise unforeseen. Because of this, actual results may differ materially from those derived from our modeling exercises.

We also continue to actively explore and analyze credible scientific evidence, including the potential impact of global climate change, that may affect our ability to manage our exposure under the insurance policies we issue as well as the impact that laws and regulations intended to combat climate change may have on us.

Despite our efforts to manage our catastrophe exposure, the occurrence of one or more severe catastrophic events could have a material effect on the Corporation’s results of operations, financial condition or liquidity.

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    Loss Reserves

Unpaid losses and loss expenses, also referred to as loss reserves, are the largest liability of our property and casualty subsidiaries.

Our loss reserves include case estimates for claims that have been reported and estimates for claims that have been incurred but not reported at the balance sheet date as well as estimates of the expenses associated with processing and settling all reported and unreported claims, less estimates of anticipated salvage and subrogation recoveries. Estimates are based upon past loss experience modified for current trends as well as prevailing economic, legal and social conditions. Our loss reserves are not discounted to present value.

We regularly review our loss reserves using a variety of actuarial techniques. We update the reserve estimates as historical loss experience develops, additional claims are reported and/or settled and new information becomes available. Any changes in estimates are reflected in operating results in the period in which the estimates are changed.

Incurred but not reported (IBNR) reserve estimates are generally calculated by first projecting the ultimate cost of all claims that have occurred and then subtracting reported losses and loss expenses. Reported losses include cumulative paid losses and loss expenses plus case reserves. The IBNR reserve includes a provision for claims that have occurred but have not yet been reported to us, some of which are not yet known to the insured, as well as a provision for future development on reported claims. A relatively large proportion of our net loss reserves, particularly for long tail liability classes, are reserves for IBNR losses. In fact, about 70% of our aggregate net loss reserves at June 30, 2013 were for IBNR losses.

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Our gross case and IBNR loss reserves and related reinsurance recoverable by class of business were as follows:

	Gross Loss Reserves						Reinsurance		Net Loss
June 30, 2013	Case		IBNR		Total		Recoverable		Reserves
	(in millions)
Personal insurance
Automobile	$	273	$	146	$	419	$	19	$	400
Homeowners		416		420		836		72		764
Other		384		698		1,082		125		957
Total personal		1,073		1,264		2,337		216		2,121
Commercial insurance
Multiple peril		608		1,219		1,827		48		1,779
Casualty		1,497		5,397		6,894		361		6,533
Workers’ compensation		974		1,948		2,922		244		2,678
Property and marine		877		633		1,510		426		1,084
Total commercial		3,956		9,197		13,153		1,079		12,074
Specialty insurance
Professional liability		1,338		6,114		7,452		367		7,085
Surety		23		59		82		5		77
Total specialty		1,361		6,173		7,534		372		7,162
Total insurance		6,390		16,634		23,024		1,667		21,357
Reinsurance assumed		185		322		507		166		341
Total	$	6,575	$	16,956	$	23,531	$	1,833	$	21,698
	Gross Loss Reserves						Reinsurance		Net Loss
December 31, 2012	Case		IBNR		Total		Recoverable		Reserves
	(in millions)
Personal insurance
Automobile	$	265	$	146	$	411	$	24	$	387
Homeowners		437		589		1,026		128		898
Other		369		687		1,056		130		926
Total personal		1,071		1,422		2,493		282		2,211
Commercial insurance
Multiple peril		598		1,257		1,855		56		1,799
Casualty		1,504		5,339		6,843		358		6,485
Workers’ compensation		963		1,862		2,825		218		2,607
Property and marine		825		940		1,765		449		1,316
Total commercial		3,890		9,398		13,288		1,081		12,207
Specialty insurance
Professional liability		1,440		6,095		7,535		385		7,150
Surety		28		59		87		4		83
Total specialty		1,468		6,154		7,622		389		7,233
Total insurance		6,429		16,974		23,403		1,752		21,651
Reinsurance assumed		193		367		560		189		371
Total	$	6,622	$	17,341	$	23,963	$	1,941	$	22,022

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Loss reserves, net of reinsurance recoverable, decreased by $324 million during the first six months of 2013. Loss reserves related to our insurance business decreased by $294 million during the first six months of 2013, which reflected decreases of $329 million related to catastrophe losses and approximately $25 million related to the effect of foreign currency translation due to the stronger U.S. dollar at June 30, 2013 compared to December 31, 2012. Loss reserves related to our reinsurance assumed business, which is in runoff, decreased by $30 million.

The decreases in our homeowners and property and marine gross loss reserves during the first six months of 2013 were due largely to payments during the first six months of 2013 on catastrophe-related claims, primarily from Storm Sandy, that were unpaid at December 31, 2012. The overall decrease in reinsurance recoverable during the first six months of 2013 was due in large part to reinsurance recoveries related to Storm Sandy in the homeowners and property and marine classes of business.

In establishing the loss reserves of our property and casualty subsidiaries, we consider facts currently known and the present state of the law and coverage litigation. Based on all information currently available, we believe that the aggregate loss reserves at June 30, 2013 were adequate to cover claims for losses that had occurred as of that date, including both those known to us and those yet to be reported. However, as discussed in Item 7 of our Annual Report on Form 10-K for the year ended December 31, 2012, there are significant uncertainties inherent in the loss reserving process. It is therefore possible that management’s estimate of the ultimate liability for losses that had occurred as of June 30, 2013 may change, which could have a material effect on the Corporation’s results of operations and financial condition.

Changes in loss reserve estimates are unavoidable because such estimates are subject to the outcome of future events. Loss trends vary and time is required for changes in trends to be recognized and confirmed. Reserve changes that increase previous estimates of ultimate cost are referred to as unfavorable or adverse development or reserve strengthening. Reserve changes that decrease previous estimates of ultimate cost are referred to as favorable development or reserve releases.

We estimate that we experienced overall favorable prior year development of about $405 million during the first six months of 2013 and $215 million in the second quarter compared with favorable prior year development of about $265 million and $165 million, respectively, in the same periods of 2012, on loss reserves established as of the respective previous year end.

The favorable development in the first six months of 2013 was primarily in the commercial property classes, partly due to lower than expected severity primarily in the 2012 accident year and, to a lesser extent, in the commercial liability classes due to continued favorable loss experience related mainly to accident years 2010 and prior, and in the professional liability classes due to favorable loss experience related mainly to accident years 2008 and prior. The favorable development in the first six months of 2012 occurred primarily in the commercial liability and professional liability classes due to continued favorable loss experience related mainly to accident years 2008 and prior, as well as in the personal insurance classes.

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Investment Results

Property and casualty investment income before taxes decreased by 7% in the first six months of 2013 and 6% in the second quarter compared with the same periods in 2012. The decrease was due to a decline in average yields on our investment portfolio partially offset by the impact of an increase in our average invested assets. The average yield on the fixed maturity investment portfolio of the property and casualty subsidiaries for the first six months and second quarter of 2013 decreased compared to the same periods of 2012 due to the continuing impact of lower reinvestment yields compared to the yields on fixed maturities that matured, were redeemed by the issuer or were sold since the second quarter of 2012. The increase in average invested assets during the first six months and second quarter of 2013 compared with the same periods of 2012 was due to substantial operating cash flows in the last six months of 2012 and the first six months of 2013 partially offset by dividend distributions made by the property and casualty subsidiaries to Chubb during 2012 and the first quarter of 2013.

The effective tax rate on our investment income was 18.0% in the first six months of 2013 compared with 18.9% in the same period of 2012. The effective tax rate fluctuates as the proportion of tax exempt investment income relative to total investment income changes from period to period.

On an after-tax basis, property and casualty investment income decreased by 6% in the first six months and the second quarter of 2013 compared with the same periods in 2012. The after-tax annualized yield on the investment portfolio that supports our property and casualty insurance business was 2.91% and 3.18% in the first six months of 2013 and 2012, respectively.

If both investment yields and average foreign currency to U.S. dollar exchange rates for the last six months of 2013 are similar to June 30, 2013 levels, property and casualty investment income after taxes for the full year 2013 is expected to decline from the full year 2012 amount. This expected decline results from the effect of investing funds from securities that matured in 2012 and 2013 in securities with yields lower than the yields on the maturing securities and the expectation that this pattern will continue during the remainder of 2013. The expected decline includes the positive impact of a slightly higher amount of average invested assets estimated to be held during 2013, based on expectations of cash flows during the year.

Other Income and Charges

Other income and charges, which includes miscellaneous income and expenses of the property and casualty subsidiaries, was not significant in the first six months of 2013 and 2012.

Corporate and Other

Corporate and other comprises investment income earned on corporate invested assets, interest expense and other expenses not allocated to our operating subsidiaries and the results of our non-insurance subsidiaries.

Corporate and other produced a loss before taxes of $121 million in the first six months of 2013 compared to a loss of $117 million for the same period of 2012.

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Realized Investment Gains and Losses

Net realized investment gains and losses were as follows:

	Periods Ended June 30
	Six Months						Second Quarter
	2013			2012			2013			2012
	(in millions)
Net realized gains
Fixed maturities	$	17		$	52		$	6		$	17
Equity securities		174			25			119			6
Other invested assets		133			63			59			55
		324			140			184			78
Other-than-temporary impairment losses
Fixed maturities		—			(2	)		—			(1	)
Equity securities		(7	)		(35	)		(5	)		(30	)
		(7	)		(37	)		(5	)		(31	)
Realized investment gains before tax	$	317		$	103		$	179		$	47
Realized investment gains after tax	$	206		$	67		$	116		$	30

The net realized gains of equity securities and other invested assets in the first six months and second quarter of 2013 included $74 million and $10 million, respectively, related to the exchange of our holdings of common stock and warrants of Alterra Capital Holdings Limited for common stock of Markel Corporation and cash as a result of a business combination.

The net realized gains and losses of other invested assets represent primarily the aggregate of realized gain distributions to us from the limited partnerships in which we have an interest and changes in our equity in the net assets of those partnerships based on valuations provided to us by the manager of each partnership. Due to the timing of our receipt of valuation data from the investment managers, the value of these investments and any related realized gains and losses are generally reported on a one quarter lag.

The net realized gains of the limited partnerships reported in the first six months of 2013 primarily reflected the positive performance of the global equity and high yield investment markets in the first quarter of 2013 and the fourth quarter of 2012. The net realized gains of the limited partnerships reported in the first six months of 2012 primarily reflected the strong performance of the U.S. equity and high yield investment markets in the first quarter of 2012 partially offset by the negative performance of several non-U.S. equity markets, particularly in Asia, in the fourth quarter of 2011.

We regularly review the invested assets that have a fair value less than cost to determine if an other-than-temporary decline in value has occurred. We have a monitoring process overseen by a committee of investment and accounting professionals that is responsible for identifying those securities to be specifically evaluated for a potential other-than-temporary impairment.

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The determination of whether a decline in value of any investment is temporary or other than temporary requires the judgment of management. The assessment of other-than-temporary impairment of fixed maturities and equity securities is based on both quantitative criteria and qualitative information. A number of factors are considered including, but not limited to, the length of time and the extent to which the fair value has been less than the cost, the financial condition and near term prospects of the issuer, whether the issuer is current on contractually obligated interest and principal payments, general market conditions and industry or sector specific factors. The decision to recognize a decline in the value of a security carried at fair value as other than temporary rather than temporary has no impact on shareholders’ equity.

In determining whether fixed maturities are other than temporarily impaired, we are required to recognize an other-than-temporary impairment loss when we conclude that we have the intent to sell or it is more likely than not that we will be required to sell an impaired fixed maturity before the security recovers to its amortized cost value or it is likely we will not recover the entire amortized cost value of an impaired security. If we have the intent to sell or it is more likely than not that we will be required to sell an impaired fixed maturity before the security recovers to its amortized cost value, the security is written down to fair value and the entire amount of the writedown is included in net income as a realized investment loss. For all other impaired fixed maturities, when the impairment is determined to be other than temporary, the impairment loss is separated into the amount representing the credit loss and the amount representing the loss related to all other factors. The amount of the impairment loss that represents the credit loss is included in net income as a realized investment loss and the amount of the impairment loss that relates to all other factors is included in other comprehensive income.

In determining whether equity securities are other than temporarily impaired, we consider our intent and ability to hold a security for a period of time sufficient to allow us to recover our cost. If a decline in the fair value of an equity security is deemed to be other than temporary, the security is written down to fair value and the amount of the writedown is included in net income as a realized investment loss.

Capital Resources and Liquidity

Capital resources and liquidity represent a company’s overall financial strength and its ability to generate cash flows, borrow funds at competitive rates and raise new capital to meet operating and growth needs.

Capital Resources

Capital resources provide protection for policyholders, furnish the financial strength to support the business of underwriting insurance risks and facilitate continued business growth. At June 30, 2013, the Corporation had shareholders’ equity of $15.5 billion and total debt of $3.3 billion.

On April 1, 2013, Chubb repaid $275 million of outstanding 5.2% notes due on that date.

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Management regularly monitors the Corporation’s capital resources. In connection with our long term capital strategy, Chubb from time to time contributes capital to its property and casualty subsidiaries. In addition, in order to satisfy capital needs as a result of any rating agency capital adequacy or other future rating issues, or in the event we were to need additional capital to make strategic investments in light of market opportunities, we may take a variety of actions, which could include the issuance of additional debt and/or equity securities. We believe that our strong financial position and current debt level provide us with the flexibility and capacity to obtain funds externally through debt or equity financings on both a short term and long term basis.

In January 2012, the Board of Directors authorized the repurchase of up to $1.2 billion of Chubb’s common stock. On January 31, 2013, the Board of Directors authorized the repurchase of up to $1.3 billion of Chubb’s common stock, which authorization replaced the January 2012 authorization. Under these authorizations, during the first six months of 2013, we repurchased 7,636,990 shares of Chubb’s common stock in open market transactions at a cost of $649 million. The January 2013 authorization has no expiration date and as of June 30, 2013, $758 million remained under this authorization. We expect to complete the repurchase of shares under this authorization by the end of January 2014, subject to market conditions and other factors.

Ratings

Chubb and its property and casualty insurance subsidiaries are rated by major rating agencies. These ratings reflect the rating agency’s opinion of our financial strength, operating performance, strategic position and ability to meet our obligations to policyholders.

Credit ratings assess a company’s ability to make timely payments of interest and principal on its debt. Financial strength ratings assess an insurer’s ability to meet its financial obligations to policyholders.

Ratings are an important factor in establishing our competitive position in the insurance markets. There can be no assurance that our ratings will continue for any given period of time or that they will not be changed.

It is possible that one or more of the rating agencies may raise or lower our existing ratings in the future. If our credit ratings were downgraded, we might incur higher borrowing costs and might have more limited means to access capital. A downgrade in our financial strength ratings could adversely affect the competitive position of our insurance operations, including a possible reduction in demand for our products in certain markets.

Liquidity

Liquidity is a measure of a company’s ability to generate sufficient cash flows to meet the short and long term cash requirements of its business operations.

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The Corporation’s liquidity requirements in the past have generally been met by funds from operations and we expect that in the future funds from operations will continue to be sufficient to meet such requirements. Liquidity requirements could also be met by funds received upon the maturity or sale of marketable securities in our investment portfolio. The Corporation also has the ability to borrow under its $500 million credit facility and we believe we could issue debt or equity securities.

Our property and casualty operations provide liquidity in that insurance premiums are generally received months or even years before losses are paid under the policies purchased by such premiums. Cash receipts from operations, consisting of insurance premiums and investment income, provide funds to pay losses, operating expenses and dividends to Chubb. After satisfying our cash requirements, excess cash flows are used to build the investment portfolio, with the expectation of generating increased future investment income.

Our strong underwriting and investment results generated substantial positive operating cash flows in the first six months of 2013 and 2012. The cash provided by the property and casualty subsidiaries’ operating activities decreased in the first six months of 2013 compared to the same period of 2012. The positive impact of modestly higher premium collections was more than offset by the impact of higher loss payments and a lower amount of investment income received in the first six months of 2013 compared to the same period of 2012. During the first six months of 2013, the cash provided by the operating activities of the property and casualty subsidiaries exceeded the cash used for financing activities by the property and casualty subsidiaries (primarily the payment of dividends to Chubb) by approximately $70 million. In the first six months of 2013, dividends paid to Chubb by the property and casualty subsidiaries decreased by $196 million compared to the comparable period of 2012 reflecting, in part, a difference in the timing of the payment of subsidiary dividends in 2012 and those paid and anticipated to be paid in 2013. During the first six months of 2012, the cash provided by operating activities of the property and casualty subsidiaries exceeded the cash used for financing activities by the property and casualty subsidiaries (primarily the payment of dividends to Chubb) by approximately $130 million.

Our property and casualty subsidiaries maintain substantial investments in highly liquid, short term marketable securities. Accordingly, we do not anticipate selling long term fixed maturity investments to meet any liquidity needs.

Chubb’s liquidity requirements primarily include the payment of dividends to shareholders and interest and principal on debt obligations. The declaration and payment of future dividends to Chubb’s shareholders will be at the discretion of Chubb’s Board of Directors and will depend upon many factors, including our operating results, financial condition, capital requirements and any regulatory constraints.

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As a holding company, Chubb’s ability to continue to pay dividends to shareholders and to satisfy its debt obligations relies on the availability of liquid assets, which is dependent in large part on the dividend paying ability of its property and casualty subsidiaries. The timing and amount of dividends paid by the property and casualty subsidiaries to Chubb may vary from year to year. Our property and casualty subsidiaries are subject to laws and regulations in the jurisdictions in which they operate that restrict the amount and timing of dividends they may pay within twelve consecutive months without the prior approval of regulatory authorities. The restrictions are generally based on net income and on certain levels of policyholders’ surplus as determined in accordance with statutory accounting practices. Dividends in excess of such thresholds are considered “extraordinary” and require prior regulatory approval.

During the first six months of 2013, the property and casualty subsidiaries paid dividends of $634 million to Chubb. Whether regulatory approval would be required for any dividends the property and casualty subsidiaries may pay during the remainder of 2013 would depend on the amount and timing of the dividend payments. As of June 30, 2013, the maximum aggregate dividend distribution that may be made by the subsidiaries to Chubb during the remainder of 2013 without prior regulatory approval was approximately $930 million.

Invested Assets

The main objectives in managing our investment portfolios are to maximize after-tax investment income and total investment return while managing credit risk and interest rate risk in order to ensure that funds will be available to meet our insurance obligations. Investment strategies are developed based on many factors including underwriting results and our resulting tax position, regulatory requirements, fluctuations in interest rates and consideration of other market risks. Investment decisions are centrally managed by investment professionals based on guidelines established by management and approved by the boards of directors of Chubb and its respective operating companies.

Our investment portfolio primarily comprises high quality bonds, principally tax exempt securities, corporate bonds, mortgage-backed securities and U.S. Treasury securities, as well as foreign government and corporate bonds that support our operations outside the United States. The portfolio also includes equity securities, primarily publicly traded common stocks, and other invested assets, primarily private equity limited partnerships, all of which are held with the primary objective of capital appreciation.

Our objective is to achieve an appropriate mix of taxable and tax exempt securities in our portfolio to balance both investment and tax strategies. At June 30, 2013, 65% of our U.S. fixed maturity portfolio was invested in tax exempt securities. At June 30, 2013, about 75% of our tax exempt securities were rated Aa or better, with about 20% rated Aaa. The average rating of our tax exempt securities was Aa. While about 25% of our tax exempt securities were insured, the effect of insurance on the average credit rating of these securities was insignificant. The insured tax exempt securities in our portfolio have been selected based on the quality of the underlying credit and not the value of the credit insurance enhancement.

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At June 30, 2013, 4% of our taxable fixed maturity portfolio was invested in U.S. government and government agency and authority obligations other than mortgage-backed securities and had an average rating of Aa. About 55% of the U.S. government and government agency and authority obligations other than mortgage-backed securities were U.S. Treasury securities with an average rating of Aaa and the remainder were taxable bonds issued by states, municipalities and political subdivisions within the United States with an average rating of Aa.

At June 30, 2013, 47% of our taxable fixed maturity portfolio consisted of corporate bonds other than mortgage-backed securities, which were issued by a diverse group of U.S. and foreign issuers and had an average rating of A. About 55% of our corporate bonds other than mortgage-backed securities were issued by U.S. companies and about 45% were issued by foreign companies. Our foreign corporate bonds included $54 million, $20 million and $13 million issued by companies, including banks, in Ireland, Italy and Spain, respectively. We held no bonds issued by companies in Greece or Portugal.

At June 30, 2013, 39% of our taxable fixed maturity portfolio was invested in foreign government and government agency obligations, which had an average rating of Aa. The foreign government and government agency obligations consisted of high quality securities, primarily issued by national governments and, to a lesser extent, government agencies, regional governments and supranational organizations. The five largest issuers within this portfolio were Canada, Germany, the United Kingdom, Australia and Brazil, which collectively accounted for about 75% of our total foreign government and government agency obligations. Another 7% of our total foreign government and government agency obligations were issued by supranational organizations. We held no sovereign securities issued by Portugal, Ireland, Italy, Greece or Spain. We did not hold any foreign government or government agency fixed maturities that have third party guarantees.

At June 30, 2013, 10% of our taxable fixed maturity portfolio was invested in mortgage-backed securities. About 95% of the mortgage-backed securities were rated Aaa. About half of the remaining 5% were below investment grade. Of the Aaa rated securities, 16% were residential mortgage-backed securities, consisting of government agency pass-through securities guaranteed by a government agency or a government sponsored enterprise (GSE), GSE collateralized mortgage obligations (CMOs) and other CMOs, all backed by single family home mortgages. The majority of our CMOs are actively traded in liquid markets. The other 84% of the Aaa rated securities were call protected, commercial mortgage-backed securities (CMBS). All of our CMBS were senior securities with the highest level of subordination.

The net unrealized appreciation before tax of our fixed maturities and equity securities carried at fair value was $2.0 billion at June 30, 2013 compared with net unrealized appreciation before tax of $3.1 billion at December 31, 2012. Such unrealized appreciation is reflected in accumulated other comprehensive income, net of applicable deferred income taxes.

During the first six months of 2013, market yields on fixed maturity investments increased resulting in a decrease in the fair value of many of our fixed maturity investments.

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Fair Values of Financial Instruments

Fair values of financial instruments are determined by management using valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. Fair values are generally measured using quoted prices in active markets for identical assets or liabilities or other inputs, such as quoted prices for similar assets or liabilities, that are observable either directly or indirectly. In those instances where observable inputs are not available, fair values are measured using unobservable inputs for the asset or liability. Unobservable inputs reflect our own assumptions about the assumptions that market participants would use in pricing the asset or liability and are developed based on the best information available in the circumstances. Fair value estimates derived from unobservable inputs are affected by the assumptions used, including the discount rates and the estimated amounts and timing of future cash flows. The derived fair value estimates cannot be substantiated by comparison to independent markets and are not necessarily indicative of the amounts that would be realized in a current market exchange.

The fair value hierarchy prioritizes the inputs to valuation techniques used to measure fair value into three broad levels as follows:

Level 1	—	Unadjusted quoted prices in active markets for identical financial instruments.
Level 2	—	Other inputs that are observable for the financial instrument, either directly or indirectly.
Level 3	—	Significant unobservable inputs.

The methods and assumptions used to estimate the fair values of financial instruments are as follows:

Fair values for fixed maturities are determined by management, utilizing prices obtained from a third party, nationally recognized pricing service or, in the case of securities for which prices are not provided by a pricing service, from third party brokers. For fixed maturities that have quoted prices in active markets, market quotations are provided. For fixed maturities that do not trade on a daily basis, the pricing service and brokers provide fair value estimates using a variety of inputs including, but not limited to, benchmark yields, reported trades, broker/dealer quotes, issuer spreads, bids, offers, reference data, prepayment rates and measures of volatility. Management reviews on an ongoing basis the reasonableness of the methodologies used by the relevant pricing service and brokers. In addition, management, using the prices received for the securities from the pricing service and brokers, determines the aggregate portfolio price performance and reviews it against applicable indices. If management believes that significant discrepancies exist, it will discuss these with the relevant pricing service or broker to resolve the discrepancies.

Fair values of equity securities are determined by management, utilizing quoted market prices.

Fair values of warrants are determined by management, utilizing an option pricing model.

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The carrying value of short term investments approximates fair value due to the short maturities of these investments.

Fair values of long term debt issued by Chubb are determined by management, utilizing prices obtained from a third party, nationally recognized pricing service.

A pricing service provides fair value amounts for approximately 99% of our fixed maturities. The prices we obtain from a pricing service and brokers generally are non-binding, but are reflective of current market transactions in the applicable financial instruments.

At June 30, 2013 and December 31, 2012, we held an insignificant amount of financial instruments in our investment portfolio for which a lack of market liquidity impacted our determination of fair value.

Item 4 — Controls and Procedures

As of June 30, 2013, an evaluation of the effectiveness of the design and operation of the Corporation’s disclosure controls and procedures (as such term is defined in Rule 13a-15(e) of the Securities Exchange Act of 1934) was performed under the supervision and with the participation of the Corporation’s management, including Chubb’s chief executive officer and chief financial officer. Based on that evaluation, the chief executive officer and chief financial officer concluded that the Corporation’s disclosure controls and procedures were effective as of June 30, 2013.

During the quarter ended June 30, 2013, there were no changes in internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, the Corporation’s internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 1A — Risk Factors

The Corporation’s business is subject to a number of risks, including those identified in Item 1A of Chubb’s Annual Report on Form 10-K for the year ended December 31, 2012, that could have a material effect on our business, results of operations, financial condition and/or liquidity and that could cause our operating results to vary significantly from fiscal period to fiscal period. The risks described in the Annual Report on Form 10-K are not the only risks we face. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also could have a material effect on our business, results of operations, financial condition and/or liquidity.

Item 2 — Unregistered Sales of Equity Securities and Use of Proceeds

The following table summarizes Chubb’s stock repurchased each month in the quarter ended June 30, 2013:

	Total Number of Shares Purchased		Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs		Maximum Approximate Dollar Value of Shares that May Yet Be  Purchased Under the Plans or Programs(a)
							(in millions)
Period
April 2013		150,000	$	88.06		150,000	$	1,069
May 2013		1,944,859		88.50		1,944,859		897
June 2013		1,611,531		85.74		1,611,531		758
Total		3,706,390		87.28		3,706,390

(a) On January 26, 2012, the Board of Directors authorized the repurchase of up to $1.2 billion of Chubb’s common stock. On January 31, 2013, the Board of Directors authorized the repurchase of up to $1.3 billion of Chubb’s common stock replacing the January 26, 2012 authorization. The authorization has no expiration date.

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Item 6 — Exhibits

Exhibit Number		Description
	-	Rule 13a-14(a)/15d-14(a) Certifications
31.1		Certification by John D. Finnegan filed herewith.
31.2		Certification by Richard G. Spiro filed herewith.
	-	Section 1350 Certifications
32.1		Certification by John D. Finnegan filed herewith.
32.2		Certification by Richard G. Spiro filed herewith.
	-	Interactive Data File
101.INS		XBRL Instance Document
101.SCH		XBRL Taxonomy Extension Schema Document
101.CAL		XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB		XBRL Taxonomy Extension Label Linkbase Document
101.PRE		XBRL Taxonomy Extension Presentation Linkbase Document
101.DEF		XBRL Taxonomy Extension Definition Linkbase Document

SIGNATURES

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

	THE CHUBB CORPORATION
	(Registrant)
	By:	/s/ John J. Kennedy
		John J. Kennedy
		Senior Vice President and Chief Accounting Officer
Date: August 7, 2013

EX-31.1

Exhibit 31.1

THE CHUBB CORPORATION

CERTIFICATION

I, John D. Finnegan, certify that:

1.    I have reviewed this quarterly report on Form 10-Q of The Chubb Corporation;

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(s) 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(s) 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: August 7, 2013

/s/    John D. Finnegan

John D. Finnegan

Chairman, President and Chief Executive Officer

EX-31.2

Exhibit 31.2

THE CHUBB CORPORATION

CERTIFICATION

I, Richard G. Spiro, certify that:

1.    I have reviewed this quarterly report on Form 10-Q of The Chubb Corporation;

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(s) 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(s) 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: August 7, 2013

/s/    Richard G. Spiro

Richard G. Spiro

Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

THE CHUBB CORPORATION

CERTIFICATION OF PERIODIC REPORT

I, John D. Finnegan, Chairman, President and Chief Executive Officer of The Chubb Corporation (the “Corporation”), certify, pursuant to 18 U.S.C. Section 1350 adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) the Quarterly Report on Form 10-Q of the Corporation for the quarterly period ended June 30, 2013 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Corporation.

Dated: August 7, 2013

/s/    John D. Finnegan

John D. Finnegan

Chairman, President and Chief Executive Officer

EX-32.2

Exhibit 32.2

THE CHUBB CORPORATION

CERTIFICATION OF PERIODIC REPORT

I, Richard G. Spiro, Executive Vice President and Chief Financial Officer of The Chubb Corporation (the “Corporation”), certify, pursuant to 18 U.S.C. Section 1350 adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) the Quarterly Report on Form 10-Q of the Corporation for the quarterly period ended June 30, 2013 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Corporation.

Dated: August 7, 2013

/s/    Richard G. Spiro

Richard G. Spiro

Executive Vice President and Chief Financial Officer

XML

Segments Information (Tables)

6 Months Ended

Jun. 30, 2013

Segment Reporting [Abstract]

Revenues and Income Before Income Tax of Each Operating Segment

Revenues and income before income tax of each operating segment were as follows:

	Periods Ended June 30
	Second Quarter						Six Months
	2013			2012			2013			2012
	(in millions)
Revenues
Property and casualty insurance
Premiums earned
Personal insurance	$	1,050		$	1,014		$	2,081		$	2,004
Commercial insurance		1,299			1,305			2,607			2,591
Specialty insurance		645			664			1,311			1,336
Total insurance		2,994			2,983			5,999			5,931
Reinsurance assumed		1			—			—			3
		2,995			2,983			5,999			5,934
Investment income		361			381			724			772
Total property and casualty insurance		3,356			3,364			6,723			6,706
Corporate and other		16			12			28			24
Realized investment gains, net		179			47			317			103
Total revenues	$	3,551		$	3,423		$	7,068		$	6,833
Income (loss) before income tax
Property and casualty insurance
Underwriting
Personal insurance	$	75		$	58		$	225		$	219
Commercial insurance		124			18			319			69
Specialty insurance		96			65			191			131
Total insurance		295			141			735			419
Reinsurance assumed		6			8			10			19
		301			149			745			438
Increase in deferred policy acquisition costs		16			10			57			24
Underwriting income		317			159			802			462
Investment income		349			373			700			753
Other income		9			6			14			5
Total property and casualty insurance		675			538			1,516			1,220
Corporate and other		(58	)		(58	)		(121	)		(117	)
Realized investment gains, net		179			47			317			103
Total income before income tax	$	796		$	527		$	1,712		$	1,206

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CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets
Short Term Investments	$ 2,002	$ 2,528
Fixed Maturities (cost $35,837 and $35,398)	37,300	38,076
Equity Securities (cost $1,281 and $1,244)	1,845	1,663
Other Invested Assets	1,756	1,954
TOTAL INVESTED ASSETS	42,903	44,221
Cash	67	50
Accrued Investment Income	427	424
Premiums Receivable	2,315	2,185
Reinsurance Recoverable on Unpaid Losses and Loss Expenses	1,833	1,941
Prepaid Reinsurance Premiums	344	337
Deferred Policy Acquisition Costs	1,262	1,206
Deferred Income Tax	162
Goodwill	467	467
Other Assets	1,460	1,353
TOTAL ASSETS	51,240	52,184
Liabilities
Unpaid Losses and Loss Expenses	23,531	23,963
Unearned Premiums	6,514	6,361
Long Term Debt	3,300	3,575
Dividend Payable to Shareholders	114	108
Deferred Income Tax		162
Accrued Expenses and Other Liabilities	2,258	2,188
TOTAL LIABILITIES	35,717	36,357
Shareholders' Equity
Common Stock - $1 Par Value; 371,980,460 Shares	372	372
Paid-In Surplus	126	178
Retained Earnings	21,015	20,009
Accumulated Other Comprehensive Income	744	1,431
Treasury Stock, at Cost - 116,465,954 and 110,217,445 Shares	(6,734)	(6,163)
TOTAL SHAREHOLDERS' EQUITY	15,523	15,827
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 51,240	$ 52,184

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Invested Assets

6 Months Ended

Jun. 30, 2013

Text Block [Abstract]

Invested Assets

2) Invested Assets

(a) The amortized cost and fair value of fixed maturities and equity securities were as follows:

	June 30, 2013
	Amortized Cost		Gross Unrealized Appreciation		Gross Unrealized Depreciation		Fair Value
	(in millions)
Fixed maturities
Tax exempt	$	18,353	$	953	$	159	$	19,147
Taxable
U.S. government and government agency and authority obligations.		779		40		5		814
Corporate bonds		8,126		401		84		8,443
Foreign government and government agency obligations		6,813		270		21		7,062
Residential mortgage-backed securities		336		26		1		361
Commercial mortgage-backed securities		1,430		46		3		1,473
		17,484		783		114		18,153
Total fixed maturities	$	35,837	$	1,736	$	273	$	37,300
Equity securities	$	1,281	$	574	$	10	$	1,845

	December 31, 2012
	Amortized Cost		Gross Unrealized Appreciation		Gross Unrealized Depreciation		Fair Value
	(in millions)
Fixed maturities
Tax exempt	$	18,410	$	1,522	$	19	$	19,913
Taxable
U.S. government and government agency and authority obligations		973		66		—		1,039
Corporate bonds		7,331		609		3		7,937
Foreign government and government agency obligations		6,614		395		1		7,008
Residential mortgage-backed securities		421		36		2		455
Commercial mortgage-backed securities		1,649		76		1		1,724
		16,988		1,182		7		18,163
Total fixed maturities	$	35,398	$	2,704	$	26	$	38,076
Equity securities	$	1,244	$	453	$	34	$	1,663

The fair value and amortized cost of fixed maturities at June 30, 2013 by contractual maturity were as follows:

	Fair Value		Amortized Cost
	(in millions)
Due in one year or less	$	2,192	$	2,161
Due after one year through five years		14,105		13,532
Due after five years through ten years		11,328		10,699
Due after ten years		7,841		7,679
		35,466		34,071
Residential mortgage-backed securities		361		336
Commercial mortgage-backed securities		1,473		1,430
	$	37,300	$	35,837

Actual maturities could differ from contractual maturities because borrowers may have the right to call or prepay obligations.

The Corporation’s equity securities comprise a diversified portfolio of primarily U.S. publicly-traded common stocks.

The Corporation is involved in the normal course of business with variable interest entities (VIEs) primarily as a passive investor in residential mortgage-backed securities, commercial mortgage-backed securities and private equity limited partnerships issued by third party VIEs. The Corporation is not the primary beneficiary of these VIEs. The Corporation’s maximum exposure to loss with respect to these investments is limited to the investment carrying values included in the Corporation’s consolidated balance sheet and any unfunded partnership commitments.

(b) The components of unrealized appreciation or depreciation, including unrealized other-than-temporary impairment losses, of investments carried at fair value were as follows:

	June 30 2013		December 31 2012
	(in millions)
Fixed maturities
Gross unrealized appreciation	$	1,736	$	2,704
Gross unrealized depreciation		273		26
		1,463		2,678
Equity securities
Gross unrealized appreciation		574		453
Gross unrealized depreciation		10		34
		564		419
		2,027		3,097
Deferred income tax liability		710		1,084
	$	1,317	$	2,013

The following table summarizes, for all investment securities in an unrealized loss position at June 30, 2013, the aggregate fair value and gross unrealized depreciation, including unrealized other-than-temporary impairment losses, by investment category and length of time that individual securities have continuously been in an unrealized loss position.

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Depreciation		Fair Value		Gross Unrealized Depreciation		Fair Value		Gross Unrealized Depreciation
	(in millions)
Fixed maturities
Tax exempt	$	2,855	$	146	$	126	$	13	$	2,981	$	159
Taxable
U.S. government and government agency and authority obligations.		146		4		19		1		165		5
Corporate bonds		2,616		83		13		1		2,629		84
Foreign government and government agency obligations		1,440		20		9		1		1,449		21
Residential mortgage-backed securities		7		—		16		1		23		1
Commercial mortgage-backed securities		208		3		21		—		229		3
		4,417		110		78		4		4,495		114
Total fixed maturities		7,272		256		204		17		7,476		273
Equity securities		68		6		10		4		78		10
	$	7,340	$	262	$	214	$	21	$	7,554	$	283

At June 30, 2013, approximately 1,120 individual fixed maturities and 10 individual equity securities were in an unrealized loss position. The Corporation does not have the intent to sell and it is not more likely than not that the Corporation will be required to sell these fixed maturities before the securities recover to their amortized cost value. In addition, the Corporation believes that none of the declines in the fair values of these fixed maturities relate to credit losses. The Corporation has the intent and ability to hold the equity securities in an unrealized loss position for a period of time sufficient to allow for the recovery of cost. The Corporation believes that none of the declines in the fair value of these fixed maturities and equity securities were other than temporary at June 30, 2013.

The following table summarizes, for all investment securities in an unrealized loss position at December 31, 2012, the aggregate fair value and gross unrealized depreciation, including unrealized other-than-temporary impairment losses, by investment category and length of time that individual securities have continuously been in an unrealized loss position.

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Depreciation		Fair Value		Gross Unrealized Depreciation		Fair Value		Gross Unrealized Depreciation
	(in millions)
Fixed maturities
Tax exempt	$	344	$	6	$	104	$	13	$	448	$	19
Taxable
U.S. government and government agency and authority obligations		28		—		20		—		48		—
Corporate bonds		289		2		14		1		303		3
Foreign government and government agency obligations		429		1		13		—		442		1
Residential mortgage-backed securities		1		—		19		2		20		2
Commercial mortgage-backed securities		105		1		3		—		108		1
		852		4		69		3		921		7
Total fixed maturities		1,196		10		173		16		1,369		26
Equity securities		182		21		63		13		245		34
	$	1,378	$	31	$	236	$	29	$	1,614	$	60

The change in unrealized appreciation or depreciation of investments carried at fair value, including the change in unrealized other-than-temporary impairment losses, was as follows:

	Periods Ended June 30
	Second Quarter						Six Months
	2013			2012			2013			2012
	(in millions)
Change in unrealized appreciation of fixed maturities	$	(1,019	)	$	133		$	(1,215	)	$	116
Change in unrealized appreciation of equity securities		(57	)		(28	)		145			74
		(1,076	)		105			(1,070	)		190
Deferred income tax (credit)		(376	)		37			(374	)		67
	$	(700	)	$	68		$	(696	)	$	123

(c) Realized investment gains and losses were as follows:

	Periods Ended June 30
	Second Quarter						Six Months
	2013			2012			2013			2012
	(in millions)
Fixed maturities
Gross realized gains	$	14		$	24		$	27		$	62
Gross realized losses		(8	)		(7	)		(10	)		(10	)
Other-than-temporary impairment losses		—			(1	)		—			(2	)
		6			16			17			50
Equity securities
Gross realized gains		119			6			174			25
Other-than-temporary impairment losses		(5	)		(30	)		(7	)		(35	)
		114			(24	)		167			(10	)
Other invested assets		59			55			133			63
	$	179		$	47		$	317		$	103

(d) As of June 30, 2013 and December 31, 2012, fixed maturities still held by the Corporation for which a portion of their other-than-temporary impairment losses were recognized in other comprehensive income had cumulative credit-related losses of $21 million and $22 million, respectively, recognized in net income.

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Invested Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013 Investment	Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]
Approximate number of individual fixed maturities in unrealized loss position	1,120
Approximate number of individual equity securities in unrealized loss position	10
Cumulative credit-related losses recognized in net income	$ 21	$ 22

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Fair Values of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Carrying Values and Fair Values of Financial Instruments

The carrying values and fair values of financial instruments were as follows:

	June 30, 2013				December 31, 2012
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in millions)
Assets
Invested assets
Short term investments	$	2,002	$	2,002	$	2,528	$	2,528
Fixed maturities		37,300		37,300		38,076		38,076
Equity securities		1,845		1,845		1,663		1,663
Other invested assets		—		—		46		46
Liabilities
Long term debt		3,300		3,851		3,575		4,372

Fair Value of Financial Instruments Categorized Based Upon Lowest Level of Input

The fair value of financial instruments categorized based upon the lowest level of input that was significant to the fair value measurement was as follows:

	June 30, 2013
	Level 1		Level 2		Level 3		Total
	(in millions)
Assets
Short term investments	$	137	$	1,865	$	—	$	2,002
Fixed maturities
Tax exempt		—		19,142		5		19,147
Taxable
U.S. government and government agency and authority obligations		—		814		—		814
Corporate bonds		—		8,317		126		8,443
Foreign government and government agency obligations		—		7,052		10		7,062
Residential mortgage-backed securities		—		353		8		361
Commercial mortgage-backed securities		—		1,473		—		1,473
		—		18,009		144		18,153
Total fixed maturities		—		37,151		149		37,300
Equity securities		1,838		—		7		1,845
	$	1,975	$	39,016	$	156	$	41,147
Liabilities
Long term debt	$	—	$	3,851	$	—	$	3,851

	December 31, 2012
	Level 1		Level 2		Level 3		Total
	(in millions)
Assets
Short term investments	$	182	$	2,346	$	—	$	2,528
Fixed maturities
Tax exempt		—		19,907		6		19,913
Taxable
U.S. government and government agency and authority obligations		—		1,039		—		1,039
Corporate bonds		—		7,779		158		7,937
Foreign government and government agency obligations		—		7,008		—		7,008
Residential mortgage-backed securities		—		446		9		455
Commercial mortgage-backed securities		—		1,724		—		1,724
		—		17,996		167		18,163
Total fixed maturities		—		37,903		173		38,076
Equity securities		1,655		—		8		1,663
Other invested assets		—		—		46		46
	$	1,837	$	40,249	$	227	$	42,313
Liabilities
Long term debt	$	—	$	4,372	$	—	$	4,372

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Comprehensive Income - Components of Other Comprehensive Income or Loss (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net unrealized holding losses arising during the period, Before Tax	$ (956)		$ (886)
Reclassification adjustment for net realized gains (Losses) included in net income, Before Tax	120		184
Net unrealized losses recognized in other comprehensive income or loss, Before Tax	(1,076)		(1,070)
Postretirement benefit costs not yet recognized in net income arising during the period, Before Tax	(1)		1
Reclassification adjustment for the amortization of net actuarial loss and prior service cost, Before Tax	(23)		(47)
Net change in postretirement benefit costs not yet recognized in net income, Before Tax	22		48
Foreign currency translation gains (losses), Before Tax	42		(35)
Total other comprehensive loss, Before Tax	(1,012)		(1,057)
Net unrealized holding losses arising during the period, Income Tax	(334)		(310)
Reclassification adjustment for net realized gains included in net income, Income Tax	42		64
Net unrealized losses recognized in other comprehensive income or loss, Income Tax	(376)		(374)
Postretirement benefit costs not yet recognized in net income arising during the period, Income Tax	(1)
Reclassification adjustment for the amortization of net actuarial loss and prior service cost, Income Tax	(9)		(17)
Net change in postretirement benefit costs not yet recognized in net income, Income Tax	8		17
Foreign currency translation gains (losses), Income Tax	14		(13)
Total other comprehensive loss, Income Tax	(354)		(370)
Net unrealized holding losses arising during the period, Net of Tax	(622)		(576)
Reclassification adjustment for net realized gains included in net income, Net of Tax	78		120
Net unrealized losses recognized in other comprehensive income or loss, Net of Tax	(700)	67	(696)	121
Postretirement benefit costs not yet recognized in net income arising during the period, Net of Tax			1
Reclassification adjustment for the amortization of net actuarial loss and prior service cost, Net of Tax	(14)		(30)
Net change in postretirement benefit costs not yet recognized in net income, Net of Tax	14	14	31	28
Foreign currency translation gains (losses), Net of Tax	28	(28)	(22)	(37)
Total Other Comprehensive Income (Loss) Net of Tax	$ (658)	$ 54	$ (687)	$ 114

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Invested Assets - Realized Investment Gains and Losses (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Investments Debt And Equity Securities [Abstract]
Fixed maturities, Gross realized gains	$ 14	$ 24	$ 27	$ 62
Fixed maturities, Gross realized losses	(8)	(7)	(10)	(10)
Fixed maturities, Other-than-temporary impairment losses		(1)		(2)
Total fixed maturities	6	16	17	50
Equity securities, Gross realized gains	119	6	174	25
Equity securities, Other-than-temporary impairment losses	(5)	(30)	(7)	(35)
Total equity securities	114	(24)	167	(10)
Other invested assets	59	55	133	63
Total Realized Investment Gains, Net	$ 179	$ 47	$ 317	$ 103

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Fair Values of Financial Instruments - Additional Information (Detail)	Jun. 30, 2013
Fair Value Disclosures [Abstract]
Percentage of fair value amounts for fixed maturities provided by a pricing service	99.00%

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Invested Assets - Change in Unrealized Appreciation or Depreciation of Investments Carried at Fair Value (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Investments Debt And Equity Securities [Abstract]
Change in unrealized appreciation of fixed maturities	$ (1,019)	$ 133	$ (1,215)	$ 116
Change in unrealized appreciation of equity securities	(57)	(28)	145	74
Change in unrealized appreciation of fixed maturities and equity securities	(1,076)	105	(1,070)	190
Deferred income tax (credit)	(376)	37	(374)	67
Total change in unrealized appreciation (depreciation) of fixed maturities and equity securities, Net of tax	$ (700)	$ 68	$ (696)	$ 123

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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Millions	Total	Common Stock [Member]	Paid-In-Surplus [Member]	Retained Earnings [Member]	Unrealized Appreciation of Investments Including Unrealized Other-Than-Temporary Impairment Losses [Member]	Foreign Currency Translation Gains [Member]	Postretirement Benefit Costs Not Yet Recognized in Net Income [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock, at Cost [Member]
Balance, Beginning of Year at Dec. 31, 2011		$ 372	$ 190	$ 18,903	$ 1,736	$ 146	$ (687)		$ (5,359)
Net Income	910			910
Repurchase of Shares									(606)
Changes Related to Stock-Based Employee Compensation (includes tax benefit of $27 and $21)			(47)
Change During Period, Net of Tax	114				123	(37)	28
Dividends Declared (per share $.88 and $.82)				(222)
Shares Issued Under Stock-Based Employee Compensation Plans									111
Balance, End of Period at Jun. 30, 2012	15,561	372	143	19,591	1,859	109	(659)	1,309	(5,854)
Balance, Beginning of Year at Dec. 31, 2012	15,827	372	178	20,009	2,013	135	(717)		(6,163)
Net Income	1,235			1,235
Repurchase of Shares									(649)
Changes Related to Stock-Based Employee Compensation (includes tax benefit of $27 and $21)			(52)
Change During Period, Net of Tax	(687)				(696)	(22)	31
Dividends Declared (per share $.88 and $.82)				(229)
Shares Issued Under Stock-Based Employee Compensation Plans									78
Balance, End of Period at Jun. 30, 2013	$ 15,523	$ 372	$ 126	$ 21,015	$ 1,317	$ 113	$ (686)	$ 744	$ (6,734)

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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flows from Operating Activities
Net Income	$ 1,235	$ 910
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Increase (Decrease) in Unpaid Losses and Loss Expenses, Net	(299)	279
Increase in Unearned Premiums, Net	158	115
Increase in Premiums Receivable	(130)	(118)
Change in Income Tax Payable or Recoverable	27	(100)
Amortization of Premiums and Discounts on Fixed Maturities	91	77
Depreciation	28	26
Realized Investment Gains, Net	(317)	(103)
Other, Net	(229)	(200)
Net Cash Provided by Operating Activities	564	886
Cash Flows from Investing Activities
Proceeds from Fixed Maturities - Sales	1,138	1,176
Proceeds from Fixed Maturities - Maturities, Calls and Redemptions	2,353	1,946
Proceeds from Sales of Equity Securities	273	63
Purchases of Fixed Maturities	(4,053)	(3,477)
Purchases of Equity Securities	(92)	(70)
Investments in Other Invested Assets, Net	280	179
Decrease (Increase) in Short Term Investments, Net	514	(117)
Change in Receivable or Payable from Security Transactions Not Settled, Net	165	221
Purchases of Property and Equipment, Net	(25)	(21)
Net Cash Provided by (Used In) Investing Activities	553	(100)
Cash Flows from Financing Activities
Repayment of Long Term Debt	(275)
Decrease in Funds Held Under Deposit Contracts	(4)	(6)
Proceeds from Issuance of Common Stock Under Stock-Based Employee Compensation Plans	36	60
Repurchase of Shares	(634)	(618)
Dividends Paid to Shareholders	(223)	(219)
Net Cash Used in Financing Activities	(1,100)	(783)
Net Increase in Cash	17	3
Cash at Beginning of Year	50	58
Cash at End of Period	$ 67	$ 61

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Comprehensive Income

6 Months Ended

Jun. 30, 2013

Equity [Abstract]

Comprehensive Income

3) Comprehensive Income

Comprehensive income is defined as all changes in shareholders’ equity, except those arising from transactions with shareholders. Comprehensive income includes net income and other comprehensive income or loss, which for the Corporation consists of changes in unrealized appreciation or depreciation of investments carried at fair value, changes in unrealized other-than-temporary impairment losses of fixed maturities, changes in foreign currency translation gains or losses and changes in postretirement benefit costs not yet recognized in net income.

The components of other comprehensive income or loss were as follows:

	Periods Ended June 30, 2013
	Second Quarter									Six Months
	Before Tax			Income Tax			Net of Tax			Before Tax			Income Tax			Net of Tax
	(in millions)
Net unrealized holding losses arising during the period	$	(956	)	$	(334	)	$	(622	)	$	(886	)	$	(310	)	$	(576	)
Reclassification adjustment for net realized gains included in net income		120			42			78			184			64			120
Net unrealized losses recognized in other comprehensive income or loss		(1,076	)		(376	)		(700	)		(1,070	)		(374	)		(696	)
Postretirement benefit costs not yet recognized in net income arising during the period		(1	)		(1	)		—			1			—			1
Reclassification adjustment for the amortization of net actuarial loss and prior service cost (a)		(23	)		(9	)		(14	)		(47	)		(17	)		(30	)
Net change in postretirement benefit costs not yet recognized in net income		22			8			14			48			17			31
Foreign currency translation gains (losses)		42			14			28			(35	)		(13	)		(22	)
Total other comprehensive loss	$	(1,012	)	$	(354	)	$	(658	)	$	(1,057	)	$	(370	)	$	(687	)

(a) Postretirement benefit costs recognized in net income during the period are included among several of the loss and expense components presented in the Consolidated Statement of Income.

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General

6 Months Ended

Jun. 30, 2013

Accounting Policies [Abstract]

General

1) General

The accompanying condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) and include the accounts of The Chubb Corporation (Chubb) and its subsidiaries (collectively, the Corporation). Significant intercompany transactions have been eliminated in consolidation.

The amounts included in this report are unaudited but include those adjustments, consisting of normal recurring items, that management considers necessary for a fair presentation. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes in the Notes to Consolidated Financial Statements included in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2012.

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Segments Information - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2013 Operations Business_Unit
Segment Reporting [Abstract]
Number of segment operations	2
Number Of Business Units	4

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Fair Values of Financial Instruments - Fair Value of Financial Instruments Categorized Based Upon Lowest Level of Input (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short term investments	$ 2,002	$ 2,528
Tax exempt, Fair Value	19,147	19,913
Taxable, Fair Value	18,153	18,163
Total fixed maturities, Fair Value	37,300	38,076
Equity securities	1,845	1,663
Other invested assets	1,756	1,954
Long Term Debt	3,300	3,575
Fair value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short term investments	2,002	2,528
Tax exempt, Fair Value	19,147	19,913
Taxable, Fair Value	18,153	18,163
Total fixed maturities, Fair Value	37,300	38,076
Equity securities	1,845	1,663
Other invested assets		46
Total fixed maturities, equity securities and other invested assets, Fair value	41,147	42,313
Long Term Debt	3,851	4,372
U.S. government and government agency and authority obligations [Member] | Fair value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value	814	1,039
Corporate bonds [Member] | Fair value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value	8,443	7,937
Foreign government and government agency obligations [Member] | Fair value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value	7,062	7,008
Residential mortgage-backed securities [Member] | Fair value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value	361	455
Commercial mortgage-backed securities [Member] | Fair value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value	1,473	1,724
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short term investments	137	182
Tax exempt, Fair Value
Taxable, Fair Value
Total fixed maturities, Fair Value
Equity securities	1,838	1,655
Other invested assets
Total fixed maturities, equity securities and other invested assets, Fair value	1,975	1,837
Long Term Debt
Level 1 [Member] | U.S. government and government agency and authority obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value
Level 1 [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value
Level 1 [Member] | Foreign government and government agency obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value
Level 1 [Member] | Residential mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value
Level 1 [Member] | Commercial mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short term investments	1,865	2,346
Tax exempt, Fair Value	19,142	19,907
Taxable, Fair Value	18,009	17,996
Total fixed maturities, Fair Value	37,151	37,903
Equity securities
Other invested assets
Total fixed maturities, equity securities and other invested assets, Fair value	39,016	40,249
Long Term Debt	3,851	4,372
Level 2 [Member] | U.S. government and government agency and authority obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value	814	1,039
Level 2 [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value	8,317	7,779
Level 2 [Member] | Foreign government and government agency obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value	7,052	7,008
Level 2 [Member] | Residential mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value	353	446
Level 2 [Member] | Commercial mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value	1,473	1,724
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short term investments
Tax exempt, Fair Value	5	6
Taxable, Fair Value	144	167
Total fixed maturities, Fair Value	149	173
Equity securities	7	8
Other invested assets		46
Total fixed maturities, equity securities and other invested assets, Fair value	156	227
Long Term Debt
Level 3 [Member] | U.S. government and government agency and authority obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value
Level 3 [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value	126	158
Level 3 [Member] | Foreign government and government agency obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value	10
Level 3 [Member] | Residential mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value	8	9
Level 3 [Member] | Commercial mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Taxable, Fair Value

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 579	$ 404	$ 1,235	$ 910
Other Comprehensive Income (Loss), Net of Tax
Change in Unrealized Appreciation of Investments	(700)	67	(696)	121
Change in Unrealized Other-Than-Temporary Impairment Losses on Investments		1		2
Foreign Currency Translation Gains (Losses)	28	(28)	(22)	(37)
Change in Postretirement Benefit Costs Not Yet Recognized in Net Income	14	14	31	28
Total Other Comprehensive Income (Loss) Net of Tax	(658)	54	(687)	114
Comprehensive Income (Loss)	$ (79)	$ 458	$ 548	$ 1,024

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Earnings Per Share

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Earnings Per Share

6) Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share:

	Periods Ended June 30
	Second Quarter				Six Months
	2013		2012		2013		2012
	(in millions, except for per share amounts)
Basic earnings per share:
Net income	$	579	$	404	$	1,235	$	910
Weighted average shares outstanding		260.5		271.5		261.9		272.9
Basic earnings per share	$	2.22	$	1.49	$	4.72	$	3.33
Diluted earnings per share:
Net income	$	579	$	404	$	1,235	$	910
Weighted average shares outstanding		260.5		271.5		261.9		272.9
Additional shares from assumed issuance of shares under stock- based compensation awards		1.0		1.8		1.3		1.9
Weighted average shares and potential shares assumed outstanding for computing diluted earnings per share		261.5		273.3		263.2		274.8
Diluted earnings per share	$	2.21	$	1.48	$	4.69	$	3.31

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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Fixed Maturities, cost	$ 35,837	$ 35,398
Equity Securities, cost	$ 1,281	$ 1,244
Common Stock, Par Value	$ 1	$ 1
Common Stock, Shares Issued	371,980,460	371,980,460
Treasury Stock, Shares	116,465,954	110,217,445

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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues
Premiums Earned	$ 2,995	$ 2,983	$ 5,999	$ 5,934
Investment Income	368	390	740	791
Other Revenues	9	3	12	5
Realized Investment Gains (Losses), Net
Total Other-Than-Temporary Impairment Losses on Investments	(5)	(30)	(7)	(35)
Other-Than-Temporary Impairment Losses on Investments Recognized in Other Comprehensive Income		(1)		(2)
Other Realized Investment Gains, Net	184	78	324	140
Total Realized Investment Gains, Net	179	47	317	103
Total Revenues	3,551	3,423	7,068	6,833
Losses and Expenses
Losses and Loss Expenses	1,694	1,860	3,262	3,567
Amortization of Deferred Policy Acquisition Costs	617	607	1,204	1,183
Other Insurance Operating Costs and Expenses	358	351	717	717
Investment Expenses	13	10	26	21
Other Expenses	11	3	17	6
Corporate Expenses	62	65	130	133
Total Losses and Expenses	2,755	2,896	5,356	5,627
Income Before Federal and Foreign Income Tax	796	527	1,712	1,206
Federal and Foreign Income Tax	217	123	477	296
Net Income	$ 579	$ 404	$ 1,235	$ 910
Net Income Per Share
Basic	$ 2.22	$ 1.49	$ 4.72	$ 3.33
Diluted	$ 2.21	$ 1.48	$ 4.69	$ 3.31
Dividends Declared Per Share	$ 0.44	$ 0.41	$ 0.88	$ 0.82

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Segments Information - Revenues and Income Before Income Tax of Each Operating Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues
Premiums earned related to insurance business	$ 2,994	$ 2,983	$ 5,999	$ 5,931
Investment Income	368	390	740	791
Premiums earned related to reinsurance assumed	1			3
Net Premiums earned	2,995	2,983	5,999	5,934
Corporate and other	16	12	28	24
Realized investment gains, net	179	47	317	103
Total revenues	3,551	3,423	7,068	6,833
Insurance underwriting income (loss)	295	141	735	419
Reinsurance assumed underwriting income	6	8	10	19
Underwriting income before deferred policy acquisition costs	301	149	745	438
Increase in deferred policy acquisition costs	16	10	57	24
Underwriting income	317	159	802	462
Total property and casualty insurance	675	538	1,516	1,220
Corporate and other	(58)	(58)	(121)	(117)
Realized investment gains, net	179	47	317	103
Income Before Federal and Foreign Income Tax	796	527	1,712	1,206
Personal insurance [Member]
Revenues
Premiums earned related to insurance business	1,050	1,014	2,081	2,004
Insurance underwriting income (loss)	75	58	225	219
Commercial insurance [Member]
Revenues
Premiums earned related to insurance business	1,299	1,305	2,607	2,591
Insurance underwriting income (loss)	124	18	319	69
Specialty insurance [Member]
Revenues
Premiums earned related to insurance business	645	664	1,311	1,336
Insurance underwriting income (loss)	96	65	191	131
Property and casualty insurance [Member]
Revenues
Investment Income	361	381	724	772
Total revenues	3,356	3,364	6,723	6,706
Investment income	349	373	700	753
Other income	$ 9	$ 6	$ 14	$ 5

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Invested Assets - Fair Value and Gross Unrealized Depreciation of Investments in Unrealized Loss Position (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule of Available-For-Sale Securities [Line Items]
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Fair Value	$ 7,340	$ 1,378
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Gross Unrealized Depreciation	262	31
Investment securities, Continuous unrealized loss position, 12 Months or More, Fair Value	214	236
Investment securities, Continuous unrealized loss position, 12 Months or More, Gross Unrealized Depreciation	21	29
Investment securities, Continuous unrealized loss position, Fair Value, Total	7,554	1,614
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total	283	60
Fixed maturities [Member]
Schedule of Available-For-Sale Securities [Line Items]
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Fair Value	7,272	1,196
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Gross Unrealized Depreciation	256	10
Investment securities, Continuous unrealized loss position, 12 Months or More, Fair Value	204	173
Investment securities, Continuous unrealized loss position, 12 Months or More, Gross Unrealized Depreciation	17	16
Investment securities, Continuous unrealized loss position, Fair Value, Total	7,476	1,369
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total	273	26
Equity securities [Member]
Schedule of Available-For-Sale Securities [Line Items]
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Fair Value	68	182
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Gross Unrealized Depreciation	6	21
Investment securities, Continuous unrealized loss position, 12 Months or More, Fair Value	10	63
Investment securities, Continuous unrealized loss position, 12 Months or More, Gross Unrealized Depreciation	4	13
Investment securities, Continuous unrealized loss position, Fair Value, Total	78	245
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total	10	34
Tax exempt [Member] | Fixed maturities [Member]
Schedule of Available-For-Sale Securities [Line Items]
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Fair Value	2,855	344
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Gross Unrealized Depreciation	146	6
Investment securities, Continuous unrealized loss position, 12 Months or More, Fair Value	126	104
Investment securities, Continuous unrealized loss position, 12 Months or More, Gross Unrealized Depreciation	13	13
Investment securities, Continuous unrealized loss position, Fair Value, Total	2,981	448
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total	159	19
Taxable [Member] | Fixed maturities [Member]
Schedule of Available-For-Sale Securities [Line Items]
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Fair Value	4,417	852
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Gross Unrealized Depreciation	110	4
Investment securities, Continuous unrealized loss position, 12 Months or More, Fair Value	78	69
Investment securities, Continuous unrealized loss position, 12 Months or More, Gross Unrealized Depreciation	4	3
Investment securities, Continuous unrealized loss position, Fair Value, Total	4,495	921
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total	114	7
U.S. government and government agency and authority obligations [Member] | Taxable [Member] | Fixed maturities [Member]
Schedule of Available-For-Sale Securities [Line Items]
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Fair Value	146	28
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Gross Unrealized Depreciation	4
Investment securities, Continuous unrealized loss position, 12 Months or More, Fair Value	19	20
Investment securities, Continuous unrealized loss position, 12 Months or More, Gross Unrealized Depreciation	1
Investment securities, Continuous unrealized loss position, Fair Value, Total	165	48
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total	5
Corporate bonds [Member] | Taxable [Member] | Fixed maturities [Member]
Schedule of Available-For-Sale Securities [Line Items]
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Fair Value	2,616	289
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Gross Unrealized Depreciation	83	2
Investment securities, Continuous unrealized loss position, 12 Months or More, Fair Value	13	14
Investment securities, Continuous unrealized loss position, 12 Months or More, Gross Unrealized Depreciation	1	1
Investment securities, Continuous unrealized loss position, Fair Value, Total	2,629	303
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total	84	3
Foreign government and government agency obligations [Member] | Taxable [Member] | Fixed maturities [Member]
Schedule of Available-For-Sale Securities [Line Items]
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Fair Value	1,440	429
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Gross Unrealized Depreciation	20	1
Investment securities, Continuous unrealized loss position, 12 Months or More, Fair Value	9	13
Investment securities, Continuous unrealized loss position, 12 Months or More, Gross Unrealized Depreciation	1
Investment securities, Continuous unrealized loss position, Fair Value, Total	1,449	442
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total	21	1
Residential mortgage-backed securities [Member] | Taxable [Member] | Fixed maturities [Member]
Schedule of Available-For-Sale Securities [Line Items]
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Fair Value	7	1
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Gross Unrealized Depreciation
Investment securities, Continuous unrealized loss position, 12 Months or More, Fair Value	16	19
Investment securities, Continuous unrealized loss position, 12 Months or More, Gross Unrealized Depreciation	1	2
Investment securities, Continuous unrealized loss position, Fair Value, Total	23	20
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total	1	2
Commercial mortgage-backed securities [Member] | Taxable [Member] | Fixed maturities [Member]
Schedule of Available-For-Sale Securities [Line Items]
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Fair Value	208	105
Investment securities, Continuous unrealized loss position, Less Than 12 Months, Gross Unrealized Depreciation	3	1
Investment securities, Continuous unrealized loss position, 12 Months or More, Fair Value	21	3
Investment securities, Continuous unrealized loss position, 12 Months or More, Gross Unrealized Depreciation
Investment securities, Continuous unrealized loss position, Fair Value, Total	229	108
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total	$ 3	$ 1

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Fair Values of Financial Instruments

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Fair Values of Financial Instruments

5) Fair Values of Financial Instruments

Fair values of financial instruments are determined by management using valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. Fair values are generally measured using quoted prices in active markets for identical assets or liabilities or other inputs, such as quoted prices for similar assets or liabilities, that are observable either directly or indirectly. In those instances where observable inputs are not available, fair values are measured using unobservable inputs for the asset or liability. Unobservable inputs reflect the Corporation’s own assumptions about the assumptions that market participants would use in pricing the asset or liability and are developed based on the best information available in the circumstances. Fair value estimates derived from unobservable inputs are affected by the assumptions used, including the discount rates and the estimated amounts and timing of future cash flows. The derived fair value estimates cannot be substantiated by comparison to independent markets and are not necessarily indicative of the amounts that would be realized in a current market exchange. Certain financial instruments, particularly insurance contracts, are excluded from fair value disclosure requirements.

The methods and assumptions used to estimate the fair values of financial instruments are as follows:

(i) The carrying value of short term investments approximates fair value due to the short maturities of these investments.

(ii) Fair values for fixed maturities are determined by management, utilizing prices obtained from a third party, nationally recognized pricing service or, in the case of securities for which prices are not provided by a pricing service, from third party brokers. For fixed maturities that have quoted prices in active markets, market quotations are provided. For fixed maturities that do not trade on a daily basis, the pricing service and brokers provide fair value estimates using a variety of inputs including, but not limited to, benchmark yields, reported trades, broker/dealer quotes, issuer spreads, bids, offers, reference data, prepayment rates and measures of volatility. Management reviews on an ongoing basis the reasonableness of the methodologies used by the relevant pricing service and brokers. In addition, management, using the prices received for the securities from the pricing service and brokers, determines the aggregate portfolio price performance and reviews it against applicable indices. If management believes that significant discrepancies exist, it will discuss these with the relevant pricing service or broker to resolve the discrepancies.

(iii) Fair values of equity securities are determined by management, utilizing quoted market prices.

(iv) Fair values of warrants included in other invested assets are determined by management, utilizing an option pricing model.

(v) Fair values of long term debt issued by Chubb are determined by management, utilizing prices obtained from a third party, nationally recognized pricing service.

The carrying values and fair values of financial instruments were as follows:

	June 30, 2013				December 31, 2012
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in millions)
Assets
Invested assets
Short term investments	$	2,002	$	2,002	$	2,528	$	2,528
Fixed maturities		37,300		37,300		38,076		38,076
Equity securities		1,845		1,845		1,663		1,663
Other invested assets		—		—		46		46
Liabilities
Long term debt		3,300		3,851		3,575		4,372

A pricing service provides fair value amounts for approximately 99% of the Corporation’s fixed maturities. The prices obtained from a pricing service and brokers generally are non-binding, but are reflective of current market transactions in the applicable financial instruments.

At June 30, 2013 and December 31, 2012, the Corporation held an insignificant amount of financial instruments in its investment portfolio for which a lack of market liquidity impacted the determination of fair value.

The fair value hierarchy prioritizes the inputs to valuation techniques used to measure fair value into three broad levels as follows:

Level 1 – Unadjusted quoted prices in active markets for identical financial instruments.

Level 2 – Other inputs that are observable for the financial instrument, either directly or indirectly.

Level 3 – Significant unobservable inputs.

The fair value of financial instruments categorized based upon the lowest level of input that was significant to the fair value measurement was as follows:

	June 30, 2013
	Level 1		Level 2		Level 3		Total
	(in millions)
Assets
Short term investments	$	137	$	1,865	$	—	$	2,002
Fixed maturities
Tax exempt		—		19,142		5		19,147
Taxable
U.S. government and government agency and authority obligations		—		814		—		814
Corporate bonds		—		8,317		126		8,443
Foreign government and government agency obligations		—		7,052		10		7,062
Residential mortgage-backed securities		—		353		8		361
Commercial mortgage-backed securities		—		1,473		—		1,473
		—		18,009		144		18,153
Total fixed maturities		—		37,151		149		37,300
Equity securities		1,838		—		7		1,845
	$	1,975	$	39,016	$	156	$	41,147
Liabilities
Long term debt	$	—	$	3,851	$	—	$	3,851

	December 31, 2012
	Level 1		Level 2		Level 3		Total
	(in millions)
Assets
Short term investments	$	182	$	2,346	$	—	$	2,528
Fixed maturities
Tax exempt		—		19,907		6		19,913
Taxable
U.S. government and government agency and authority obligations		—		1,039		—		1,039
Corporate bonds		—		7,779		158		7,937
Foreign government and government agency obligations		—		7,008		—		7,008
Residential mortgage-backed securities		—		446		9		455
Commercial mortgage-backed securities		—		1,724		—		1,724
		—		17,996		167		18,163
Total fixed maturities		—		37,903		173		38,076
Equity securities		1,655		—		8		1,663
Other invested assets		—		—		46		46
	$	1,837	$	40,249	$	227	$	42,313
Liabilities
Long term debt	$	—	$	4,372	$	—	$	4,372

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Fair Values of Financial Instruments - Carrying Values and Fair Values of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short term investments	$ 2,002	$ 2,528
Fixed maturities	37,300	38,076
Equity securities	1,845	1,663
Other invested assets	1,756	1,954
Long Term Debt	3,300	3,575
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short term investments	2,002	2,528
Fixed maturities	37,300	38,076
Equity securities	1,845	1,663
Other invested assets		46
Long Term Debt	3,300	3,575
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short term investments	2,002	2,528
Fixed maturities	37,300	38,076
Equity securities	1,845	1,663
Other invested assets		46
Long Term Debt	$ 3,851	$ 4,372

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Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2013

Equity [Abstract]

Components of Other Comprehensive Income or Loss

The components of other comprehensive income or loss were as follows:

	Periods Ended June 30, 2013
	Second Quarter									Six Months
	Before Tax			Income Tax			Net of Tax			Before Tax			Income Tax			Net of Tax
	(in millions)
Net unrealized holding losses arising during the period	$	(956	)	$	(334	)	$	(622	)	$	(886	)	$	(310	)	$	(576	)
Reclassification adjustment for net realized gains included in net income		120			42			78			184			64			120
Net unrealized losses recognized in other comprehensive income or loss		(1,076	)		(376	)		(700	)		(1,070	)		(374	)		(696	)
Postretirement benefit costs not yet recognized in net income arising during the period		(1	)		(1	)		—			1			—			1
Reclassification adjustment for the amortization of net actuarial loss and prior service cost (a)		(23	)		(9	)		(14	)		(47	)		(17	)		(30	)
Net change in postretirement benefit costs not yet recognized in net income		22			8			14			48			17			31
Foreign currency translation gains (losses)		42			14			28			(35	)		(13	)		(22	)
Total other comprehensive loss	$	(1,012	)	$	(354	)	$	(658	)	$	(1,057	)	$	(370	)	$	(687	)

(a) Postretirement benefit costs recognized in net income during the period are included among several of the loss and expense components presented in the Consolidated Statement of Income.

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Segments Information

6 Months Ended

Jun. 30, 2013

Segment Reporting [Abstract]

Segments Information

4) Segments Information

The principal business of the Corporation is the sale of property and casualty insurance. The profitability of the property and casualty insurance business depends on the results of both underwriting operations and investments, which are viewed as two distinct operations. The underwriting operations are managed and evaluated separately from the investment function.

The property and casualty insurance subsidiaries underwrite most lines of property and casualty insurance. Underwriting operations consist of four separate business units: personal insurance, commercial insurance, specialty insurance and reinsurance assumed. The personal segment targets the personal insurance market. The personal classes include automobile, homeowners and other personal coverages. The commercial segment includes those classes of business that are generally available in broad markets and are of a more commodity nature. Commercial classes include multiple peril, casualty, workers’ compensation and property and marine. The specialty segment includes those classes of business that are available in more limited markets since they require specialized underwriting and claim settlement. Specialty classes include professional liability coverages and surety. The reinsurance assumed business is in runoff following the transfer of the ongoing business to a reinsurance company in 2005.

Corporate and other includes investment income earned on corporate invested assets, corporate expenses and the results of the Corporation’s non-insurance subsidiaries.

Revenues and income before income tax of each operating segment were as follows:

	Periods Ended June 30
	Second Quarter						Six Months
	2013			2012			2013			2012
	(in millions)
Revenues
Property and casualty insurance
Premiums earned
Personal insurance	$	1,050		$	1,014		$	2,081		$	2,004
Commercial insurance		1,299			1,305			2,607			2,591
Specialty insurance		645			664			1,311			1,336
Total insurance		2,994			2,983			5,999			5,931
Reinsurance assumed		1			—			—			3
		2,995			2,983			5,999			5,934
Investment income		361			381			724			772
Total property and casualty insurance		3,356			3,364			6,723			6,706
Corporate and other		16			12			28			24
Realized investment gains, net		179			47			317			103
Total revenues	$	3,551		$	3,423		$	7,068		$	6,833
Income (loss) before income tax
Property and casualty insurance
Underwriting
Personal insurance	$	75		$	58		$	225		$	219
Commercial insurance		124			18			319			69
Specialty insurance		96			65			191			131
Total insurance		295			141			735			419
Reinsurance assumed		6			8			10			19
		301			149			745			438
Increase in deferred policy acquisition costs		16			10			57			24
Underwriting income		317			159			802			462
Investment income		349			373			700			753
Other income		9			6			14			5
Total property and casualty insurance		675			538			1,516			1,220
Corporate and other		(58	)		(58	)		(121	)		(117	)
Realized investment gains, net		179			47			317			103
Total income before income tax	$	796		$	527		$	1,712		$	1,206

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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Dividends Declared Per Share	$ 0.88	$ 0.82
Paid-In-Surplus [Member]
Tax Benefit, Stock-Based Employee Compensation	$ 27	$ 21
Retained Earnings [Member]
Dividends Declared Per Share	$ 0.88	$ 0.82

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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Basic earnings per share:
Net Income	$ 579	$ 404	$ 1,235	$ 910
Weighted average shares outstanding	260.5	271.5	261.9	272.9
Basic earnings per share	$ 2.22	$ 1.49	$ 4.72	$ 3.33
Diluted earnings per share:
Net Income	$ 579	$ 404	$ 1,235	$ 910
Weighted average shares outstanding	260.5	271.5	261.9	272.9
Additional shares from assumed issuance of shares under stock-based compensation awards	1.0	1.8	1.3	1.9
Weighted average shares and potential shares assumed outstanding for computing diluted earnings per share	261.5	273.3	263.2	274.8
Diluted earnings per share	$ 2.21	$ 1.48	$ 4.69	$ 3.31

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Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share:

	Periods Ended June 30
	Second Quarter				Six Months
	2013		2012		2013		2012
	(in millions, except for per share amounts)
Basic earnings per share:
Net income	$	579	$	404	$	1,235	$	910
Weighted average shares outstanding		260.5		271.5		261.9		272.9
Basic earnings per share	$	2.22	$	1.49	$	4.72	$	3.33
Diluted earnings per share:
Net income	$	579	$	404	$	1,235	$	910
Weighted average shares outstanding		260.5		271.5		261.9		272.9
Additional shares from assumed issuance of shares under stock- based compensation awards		1.0		1.8		1.3		1.9
Weighted average shares and potential shares assumed outstanding for computing diluted earnings per share		261.5		273.3		263.2		274.8
Diluted earnings per share	$	2.21	$	1.48	$	4.69	$	3.31

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Invested Assets (Tables)

6 Months Ended

Jun. 30, 2013

Text Block [Abstract]

Amortized Cost and Fair Value of Fixed Maturities and Equity Securities

(a) The amortized cost and fair value of fixed maturities and equity securities were as follows:

	June 30, 2013
	Amortized Cost		Gross Unrealized Appreciation		Gross Unrealized Depreciation		Fair Value
	(in millions)
Fixed maturities
Tax exempt	$	18,353	$	953	$	159	$	19,147
Taxable
U.S. government and government agency and authority obligations.		779		40		5		814
Corporate bonds		8,126		401		84		8,443
Foreign government and government agency obligations		6,813		270		21		7,062
Residential mortgage-backed securities		336		26		1		361
Commercial mortgage-backed securities		1,430		46		3		1,473
		17,484		783		114		18,153
Total fixed maturities	$	35,837	$	1,736	$	273	$	37,300
Equity securities	$	1,281	$	574	$	10	$	1,845

	December 31, 2012
	Amortized Cost		Gross Unrealized Appreciation		Gross Unrealized Depreciation		Fair Value
	(in millions)
Fixed maturities
Tax exempt	$	18,410	$	1,522	$	19	$	19,913
Taxable
U.S. government and government agency and authority obligations		973		66		—		1,039
Corporate bonds		7,331		609		3		7,937
Foreign government and government agency obligations		6,614		395		1		7,008
Residential mortgage-backed securities		421		36		2		455
Commercial mortgage-backed securities		1,649		76		1		1,724
		16,988		1,182		7		18,163
Total fixed maturities	$	35,398	$	2,704	$	26	$	38,076
Equity securities	$	1,244	$	453	$	34	$	1,663

Fair Value and Amortized Cost of Fixed Maturities by Contractual Maturity

The fair value and amortized cost of fixed maturities at June 30, 2013 by contractual maturity were as follows:

	Fair Value		Amortized Cost
	(in millions)
Due in one year or less	$	2,192	$	2,161
Due after one year through five years		14,105		13,532
Due after five years through ten years		11,328		10,699
Due after ten years		7,841		7,679
		35,466		34,071
Residential mortgage-backed securities		361		336
Commercial mortgage-backed securities		1,473		1,430
	$	37,300	$	35,837

Components of Unrealized Appreciation or Depreciation of Investments

b) The components of unrealized appreciation or depreciation, including unrealized other-than-temporary impairment losses, of investments carried at fair value were as follows:

	June 30 2013		December 31 2012
	(in millions)
Fixed maturities
Gross unrealized appreciation	$	1,736	$	2,704
Gross unrealized depreciation		273		26
		1,463		2,678
Equity securities
Gross unrealized appreciation		574		453
Gross unrealized depreciation		10		34
		564		419
		2,027		3,097
Deferred income tax liability		710		1,084
	$	1,317	$	2,013

Fair Value and Gross Unrealized Depreciation of Investments in Unrealized Loss Position

The following table summarizes, for all investment securities in an unrealized loss position at June 30, 2013, the aggregate fair value and gross unrealized depreciation, including unrealized other-than-temporary impairment losses, by investment category and length of time that individual securities have continuously been in an unrealized loss position.

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Depreciation		Fair Value		Gross Unrealized Depreciation		Fair Value		Gross Unrealized Depreciation
	(in millions)
Fixed maturities
Tax exempt	$	2,855	$	146	$	126	$	13	$	2,981	$	159
Taxable
U.S. government and government agency and authority obligations.		146		4		19		1		165		5
Corporate bonds		2,616		83		13		1		2,629		84
Foreign government and government agency obligations		1,440		20		9		1		1,449		21
Residential mortgage-backed securities		7		—		16		1		23		1
Commercial mortgage-backed securities		208		3		21		—		229		3
		4,417		110		78		4		4,495		114
Total fixed maturities		7,272		256		204		17		7,476		273
Equity securities		68		6		10		4		78		10
	$	7,340	$	262	$	214	$	21	$	7,554	$	283

The following table summarizes, for all investment securities in an unrealized loss position at December 31, 2012, the aggregate fair value and gross unrealized depreciation, including unrealized other-than-temporary impairment losses, by investment category and length of time that individual securities have continuously been in an unrealized loss position.

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Depreciation		Fair Value		Gross Unrealized Depreciation		Fair Value		Gross Unrealized Depreciation
	(in millions)
Fixed maturities
Tax exempt	$	344	$	6	$	104	$	13	$	448	$	19
Taxable
U.S. government and government agency and authority obligations		28		—		20		—		48		—
Corporate bonds		289		2		14		1		303		3
Foreign government and government agency obligations		429		1		13		—		442		1
Residential mortgage-backed securities		1		—		19		2		20		2
Commercial mortgage-backed securities		105		1		3		—		108		1
		852		4		69		3		921		7
Total fixed maturities		1,196		10		173		16		1,369		26
Equity securities		182		21		63		13		245		34
	$	1,378	$	31	$	236	$	29	$	1,614	$	60

Change in Unrealized Appreciation or Depreciation of Investments Carried at Fair Value

The change in unrealized appreciation or depreciation of investments carried at fair value, including the change in unrealized other-than-temporary impairment losses, was as follows:

	Periods Ended June 30
	Second Quarter						Six Months
	2013			2012			2013			2012
	(in millions)
Change in unrealized appreciation of fixed maturities	$	(1,019	)	$	133		$	(1,215	)	$	116
Change in unrealized appreciation of equity securities		(57	)		(28	)		145			74
		(1,076	)		105			(1,070	)		190
Deferred income tax (credit)		(376	)		37			(374	)		67
	$	(700	)	$	68		$	(696	)	$	123

Realized Investment Gains and Losses

c) Realized investment gains and losses were as follows:

	Periods Ended June 30
	Second Quarter						Six Months
	2013			2012			2013			2012
	(in millions)
Fixed maturities
Gross realized gains	$	14		$	24		$	27		$	62
Gross realized losses		(8	)		(7	)		(10	)		(10	)
Other-than-temporary impairment losses		—			(1	)		—			(2	)
		6			16			17			50
Equity securities
Gross realized gains		119			6			174			25
Other-than-temporary impairment losses		(5	)		(30	)		(7	)		(35	)
		114			(24	)		167			(10	)
Other invested assets		59			55			133			63
	$	179		$	47		$	317		$	103

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Invested Assets - Components of Unrealized Appreciation or Depreciation of Investments (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]
Fixed maturities, Gross unrealized appreciation	$ 1,736	$ 2,704
Fixed maturities, Gross unrealized depreciation	273	26
Fixed maturities, Unrealized appreciation (depreciation), Net	1,463	2,678
Equity securities, Gross Unrealized Appreciation	574	453
Equity securities, Gross Unrealized Depreciation	10	34
Equity securities, Unrealized appreciation (depreciation), Net	564	419
Total fixed maturities and equity securities, Unrealized appreciation (depreciation), Net	2,027	3,097
Deferred income tax liability	710	1,084
Total fixed maturities and equity securities, Unrealized appreciation (depreciation), Net of tax	$ 1,317	$ 2,013

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Invested Assets - Amortized Cost and Fair Value of Fixed Maturities and Equity Securities (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule of Available-For-Sale Securities [Line Items]
Tax exempt, Amortized Cost	$ 18,353	$ 18,410
Taxable, Amortized Cost	17,484	16,988
Tax exempt, Gross Unrealized Appreciation	953	1,522
Taxable, Gross Unrealized Appreciation	783	1,182
Tax exempt, Gross Unrealized Depreciation	159	19
Taxable, Gross Unrealized Depreciation	114	7
Tax exempt, Fair Value	19,147	19,913
Taxable, Fair Value	18,153	18,163
Total fixed maturities, Amortized Cost	35,837	35,398
Total fixed maturities, Gross Unrealized Appreciation	1,736	2,704
Total fixed maturities, Gross Unrealized Depreciation	273	26
Total fixed maturities, Fair Value	37,300	38,076
Equity securities, Amortized Cost	1,281	1,244
Equity securities, Gross Unrealized Appreciation	574	453
Equity securities, Gross Unrealized Depreciation	10	34
Equity securities, Fair Value	1,845	1,663
U.S. government and government agency and authority obligations [Member]
Schedule of Available-For-Sale Securities [Line Items]
Taxable, Amortized Cost	779	973
Taxable, Gross Unrealized Appreciation	40	66
Taxable, Gross Unrealized Depreciation	5
Taxable, Fair Value	814	1,039
Corporate bonds [Member]
Schedule of Available-For-Sale Securities [Line Items]
Taxable, Amortized Cost	8,126	7,331
Taxable, Gross Unrealized Appreciation	401	609
Taxable, Gross Unrealized Depreciation	84	3
Taxable, Fair Value	8,443	7,937
Foreign government and government agency obligations [Member]
Schedule of Available-For-Sale Securities [Line Items]
Taxable, Amortized Cost	6,813	6,614
Taxable, Gross Unrealized Appreciation	270	395
Taxable, Gross Unrealized Depreciation	21	1
Taxable, Fair Value	7,062	7,008
Residential mortgage-backed securities [Member]
Schedule of Available-For-Sale Securities [Line Items]
Taxable, Amortized Cost	336	421
Taxable, Gross Unrealized Appreciation	26	36
Taxable, Gross Unrealized Depreciation	1	2
Taxable, Fair Value	361	455
Commercial mortgage-backed securities [Member]
Schedule of Available-For-Sale Securities [Line Items]
Taxable, Amortized Cost	1,430	1,649
Taxable, Gross Unrealized Appreciation	46	76
Taxable, Gross Unrealized Depreciation	3	1
Taxable, Fair Value	$ 1,473	$ 1,724

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Document and Entity Information	6 Months Ended
	Jun. 30, 2013
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Trading Symbol	CB
Entity Registrant Name	CHUBB CORP
Entity Central Index Key	0000020171
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	255,514,506

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Invested Assets - Fair Value and Amortized Cost of Fixed Maturities by Contractual Maturity (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule of Available-For-Sale Securities [Line Items]
Due in one year or less, Fair Value	$ 2,192
Due after one year through five years, Fair Value	14,105
Due after five years through ten years, Fair Value	11,328
Due after ten years, Fair Value	7,841
Subtotal fixed maturities, Fair Value	35,466
Total fixed maturities, Fair Value	37,300	38,076
Due in one year or less, Amortized Cost	2,161
Due after one year through five years, Amortized Cost	13,532
Due after five years through ten years, Amortized Cost	10,699
Due after ten years, Amortized Cost	7,679
Subtotal fixed maturities, Amortized Cost	34,071
Total fixed maturities, Amortized Cost	35,837	35,398
Residential mortgage-backed securities [Member]
Schedule of Available-For-Sale Securities [Line Items]
Taxable, Fair Value	361
Taxable, Amortized Cost	336
Commercial mortgage-backed securities [Member]
Schedule of Available-For-Sale Securities [Line Items]
Taxable, Fair Value	1,473
Taxable, Amortized Cost	$ 1,430