Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Cash flows from operating activities
Net income	$ 2,853		$ 3,758		$ 2,706
Adjustments to reconcile net income to net cash flows from operating activities
Net realized (gains) losses	507		(504)		(78)
Amortization of premiums/discounts on fixed maturities	188		268		220
Deferred income taxes	145		240		(7)
Unpaid losses and loss expenses	317		(365)		203
Unearned premiums	441		402		522
Future policy benefits	236		191		158
Insurance and reinsurance balances payable	376		176		(151)
Accounts payable, accrued expenses, and other liabilities	13		37		(42)
Income taxes payable	103		(45)		(167)
Insurance and reinsurance balances receivable	(469)		(624)		335
Reinsurance recoverable on losses and loss expenses	119		787		372
Reinsurance recoverable on policy benefits	4		23		52
Deferred policy acquisition costs	(397)		(503)		(340)
Prepaid reinsurance premiums	(89)		(31)		(123)
Other	149		212		335
Net cash flows from operating activities	4,496		4,022		3,995
Cash flows from investing activities
Purchases of fixed maturities available for sale	(15,553)		(21,340)		(23,572)
Purchases of to be announced mortgage-backed securities			(58)		(389)
Purchases of fixed maturities held to maturity	(267)		(447)		(388)
Purchases of equity securities	(251)		(264)		(135)
Sales of fixed maturities available for sale	7,482		10,355		14,321
Sales of to be announced mortgage-backed securities			58		448
Sales of equity securities	670		142		119
Maturities and redemptions of fixed maturities available for sale	6,413		6,941		5,523
Maturities and redemptions of fixed maturities held to maturity	875		1,488		1,451
Net change in short-term investments	(603)		524		117
Net derivative instruments settlements	(230)		(471)		(281)
Acquisition of subsidiaries (net of cash acquired of $20, $38, and $8)	(766)		(977)		(98)
Other	(274)		(393)		(555)
Net cash flows used for investing activities	(2,504)		(4,442)		(3,439)
Cash flows from financing activities
Dividends paid on Common Shares	(862)		(517)		(815)
Common Shares repurchased	(1,429)		(287)		(11)
Proceeds from issuance of long-term debt	699		947
Proceeds from issuance of short-term debt	1,978		2,572		2,933
Repayment of short-term debt	(1,977)		(2,572)		(2,783)
Repayments of Long-term Debt	(501)
Proceeds from share-based compensation plans, including windfall tax benefits	127		135		126
Other	188		113
Net cash flows (used for) from financing activities	(1,777)		391		(550)
Effect of foreign currency rate changes on cash and cash equivalents	(139)		(7)		(5)
Net increase (decrease) in cash	76		(36)		1
Cash – beginning of year	579	[1],[2],[3]	615	[1],[4]	614	[4]
Cash – end of year	655	[2],[5]	579	[1],[2],[3]	615	[1],[4]
Supplemental cash flow information
Taxes paid	349		218		438
Interest paid	$ 264		$ 253		$ 240

[1] (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, 2013 and 2012, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[2] (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, 2014 and 2013, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[3] (1) ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Refer to Note 1 f) for additional information. At December 31, 2013, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[4] (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 and 2011, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

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