Consolidated Statements Of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Cash flows from operating activities
Net income		$ 3,861		$ 4,135		$ 2,834
Adjustments to reconcile net income to net cash flows from operating activities
Net realized (gains) losses		(84)		145		420
Amortization of premiums/discounts on fixed maturities		694		737		158
Amortization of UPR related to the Chubb Corp acquisition and other intangibles		260		1,578		171
Deferred income taxes		(527)		96		113
Unpaid losses and loss expenses		2,137		332		(375)
Unearned premiums		264		(680)		335
Future policy benefits		217		188		216
Insurance and reinsurance balances payable		271		848		268
Accounts payable, accrued expenses, and other liabilities		(517)		(97)		179
Income taxes payable		(365)		147		(148)
Insurance and reinsurance balances receivable		(243)		(616)		(53)
Reinsurance recoverable on losses and loss expenses		(1,248)		(365)		218
Reinsurance recoverable on policy benefits				7		33
Deferred policy acquisition costs		(317)		(1,449)		(435)
Prepaid reinsurance premiums		(82)		18		(212)
Other		182		268		142
Net cash flows from operating activities		4,503		5,292		3,864
Cash flows from investing activities
Purchases of fixed maturities available for sale		(25,720)		(30,759)		(16,040)
Purchases of to be announced mortgage-backed securities		(27)		(56)		(31)
Purchases of fixed maturities held to maturity		(352)		(282)		(62)
Purchases of equity securities		(173)		(146)		(158)
Sales of fixed maturities available for sale		13,228		16,621		10,783
Sales of to be announced mortgage-backed securities		27		56		31
Sales of equity securities		187		1,000		183
Maturities and redemptions of fixed maturities available for sale		10,425		9,349		6,567
Maturities and redemptions of fixed maturities held to maturity		879		958		669
Net change in short-term investments		(537)		12,350		(8,216)
Net derivative instruments settlements		(265)		(168)		(21)
Acquisition of subsidiaries (net of cash acquired of $nil, $71, and $629)				(14,248)		264
Other		(114)		10		(263)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		(2,442)		(5,315)		(6,294)
Cash flows from financing activities
Dividends paid on Common Shares		(1,308)		(1,173)		(862)
Common Shares repurchased		(801)				(758)
Proceeds from issuance of long-term debt						6,090
Proceeds from issuance of repurchase agreements		2,353		2,310		2,029
Repayment of repurchase agreements		(2,348)		(2,311)		(2,027)
Repayments of Long-term Debt		(501)		0		(1,150)
Proceeds from share-based compensation plans		151		167		131
Policyholder contract deposits		442		522		503
Policyholder contract withdrawals		(307)		(253)		(221)
Other		0		(4)		(40)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		(2,319)		(742)		3,695
Effect of foreign currency rate changes on cash and cash equivalents		1		(25)		(145)
Net increase (decrease) in cash		(257)		(790)		1,120
Cash – beginning of year		985	[1],[2],[3]	1,775	[2],[4]	655	[4]
Cash – end of year	[2]	728	[5]	985	[1],[3]	1,775	[4]
Supplemental cash flow information
Taxes paid		736		662		469
Interest paid		$ 644		$ 642		$ 259

[1] Chubb maintains two notional multi-currency cash pools (Pools) with a third-party bank. Refer to Note 1 f) for additional information. At December 31, 2016 and 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[2] Chubb maintains two notional multi-currency cash pools (Pools) with a third-party bank. Refer to Note 1 f) for additional information. At December 31, 2017 and 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[3] Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Refer to Note 1 f) for additional information. At December 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[4] Chubb maintains two notional multi-currency cash pools (Pools) with a third-party bank. Refer to Note 1 f) for additional information. At December 31, 2015 and 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[5] Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Refer to Note 1 f) for additional information. At December 31, 2017, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.