Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011
Cash flows from operating activities
Net income	$ 3,758	$ 2,706		$ 1,540
Adjustments to reconcile net income to net cash flows from operating activities
Net realized (gains) losses	(504)	(78)		795
Amortization of premiums/discounts on fixed maturities	268	220		152
Deferred income taxes	240	(7)		15
Unpaid losses and loss expenses	(365)	203		43
Unearned premiums	402	522		9
Future policy benefits	191	158		78
Insurance and reinsurance balances payable	176	(151)		216
Accounts payable, accrued expenses, and other liabilities	37	(42)		39
Income taxes payable	(45)	(167)		39
Insurance and reinsurance balances receivable	(624)	335		(217)
Reinsurance recoverable on losses and loss expenses	787	372		531
Reinsurance recoverable on policy benefits	23	52		25
Deferred policy acquisition costs	(503)	(340)		(122)
Prepaid reinsurance premiums	(31)	(123)		(34)
Other	212	335		361
Net cash flows from operating activities	4,022	3,995		3,470
Cash flows from investing activities
Purchases of fixed maturities available for sale	(21,340)	(23,572)		(23,523)
Purchases of to be announced mortgage-backed securities	(58)	(389)		(755)
Purchases of fixed maturities held to maturity	(447)	(388)		(340)
Purchases of equity securities	(264)	(135)		(309)
Sales of fixed maturities available for sale	10,355	14,321		17,176
Sales of to be announced mortgage-backed securities	58	448		795
Sales of equity securities	142	119		376
Maturities and redemptions of fixed maturities available for sale	6,941	5,523		3,720
Maturities and redemptions of fixed maturities held to maturity	1,488	1,451		1,279
Net change in short-term investments	524	117		(300)
Net derivative instruments settlements	(471)	(281)		(67)
Acquisition of subsidiaries (net of cash acquired of $38, $8, and $91)	(977)	(98)		(606)
Other	(393)	(555)		(482)
Net cash flows used for investing activities	(4,442)	(3,439)		(3,036)
Cash flows from financing activities
Dividends paid on Common Shares	(517)	(815)		(459)
Common Shares repurchased	(287)	(11)		(195)
Proceeds from issuance of long-term debt	947
Proceeds from issuance of short-term debt	2,572	2,933		5,238
Repayment of short-term debt	(2,572)	(2,783)		(5,288)
Proceeds from share-based compensation plans, including windfall tax benefits	135	126		139
Other	113
Net cash flows from (used for) financing activities	391	(550)		(565)
Effect of foreign currency rate changes on cash and cash equivalents	(7)	(5)		(27)
Net increase (decrease) in cash	(36)	1		(158)
Cash – beginning of year	615	614	[1]	772
Cash – end of year	579	615		614	[1]
Supplemental cash flow information
Taxes paid	218	438		460
Interest paid	$ 253	$ 240		$ 234

[1] ACE maintains two notional multi-currency cash pools (Pools) with a third-party bank. Refer to Note 1 f) for additional information. At December 31, 2012, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.