Consolidated Statements Of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Cash flows from operating activities
Net income		$ 4,135		$ 2,834		$ 2,853
Adjustments to reconcile net income to net cash flows from operating activities
Net realized (gains) losses		145		420		507
Amortization of premiums/discounts on fixed maturities		737		158		188
Amortization of UPR related to the Chubb Corp acquisition		1,559		0		0
Deferred income taxes		96		113		145
Unpaid losses and loss expenses		332		(375)		317
Unearned premiums		(680)		335		441
Future policy benefits		188		216		236
Insurance and reinsurance balances payable		848		268		376
Accounts payable, accrued expenses, and other liabilities		(97)		179		13
Income taxes payable		147		(148)		103
Insurance and reinsurance balances receivable		(616)		(53)		(469)
Reinsurance recoverable on losses and loss expenses		(365)		218		119
Reinsurance recoverable on policy benefits		7		33		4
Deferred policy acquisition costs		(1,449)		(435)		(397)
Prepaid reinsurance premiums		18		(212)		(89)
Other		287		313		149
Net cash flows from operating activities		5,292		3,864		4,496
Cash flows from investing activities
Purchases of fixed maturities available for sale		(30,759)		(16,040)		(15,553)
Purchases of to be announced mortgage-backed securities		(56)		(31)
Purchases of fixed maturities held to maturity		(282)		(62)		(267)
Purchases of equity securities		(146)		(158)		(251)
Sales of fixed maturities available for sale		16,621		10,783		7,482
Sales of to be announced mortgage-backed securities		56		31
Sales of equity securities		1,000		183		670
Maturities and redemptions of fixed maturities available for sale		9,349		6,567		6,413
Maturities and redemptions of fixed maturities held to maturity		958		669		875
Net change in short-term investments		12,350		(8,216)		(603)
Net derivative instruments settlements		(168)		(21)		(230)
Acquisition of subsidiaries (net of cash acquired of $71, 629, and $20)		(14,248)		264		(766)
Other		10		(263)		(274)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		(5,315)		(6,294)		(2,504)
Cash flows from financing activities
Dividends paid on Common Shares		(1,173)		(862)		(862)
Common Shares repurchased				(758)		(1,429)
Proceeds from issuance of long-term debt				6,090		699
Proceeds from issuance of repurchase agreements		2,310		2,029		1,978
Repayment of repurchase agreements		(2,311)		(2,027)		(1,977)
Repayments of Long-term Debt				(1,150)		(501)
Proceeds from share-based compensation plans, including windfall tax benefits		167		131		127
Policyholder contract deposits		522		503		366
Policyholder contract withdrawals		(253)		(221)		(172)
Other		(4)		(40)		(6)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		(742)		3,695		(1,777)
Effect of foreign currency rate changes on cash and cash equivalents		(25)		(145)		(139)
Net increase (decrease) in cash		(790)		1,120		76
Cash – beginning of year		1,775	[1],[2],[3]	655	[2],[4]	579	[4]
Cash – end of year	[2]	985	[5]	1,775	[1],[3]	655	[4]
Supplemental cash flow information
Taxes paid		662		469		349
Interest paid		$ 642		$ 259		$ 264

[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, 2015 and 2014, 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, 2016 and 2015, 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, 2015, 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, 2014 and 2013, 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, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.