Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Cash flows from operating activities
Net income	$ 681		$ 734
Adjustments to reconcile net income to net cash flows from operating activities
Net realized (gains) losses	89		104
Amortization of premiums/discounts on fixed maturities	36		53
Deferred income taxes	7		0
Unpaid losses and loss expenses	(320)		(598)
Unearned premiums	212		270
Future policy benefits	48		56
Insurance and reinsurance balances payable	158		112
Accounts payable, accrued expenses, and other liabilities	(46)		(64)
Income taxes payable	20		15
Insurance and reinsurance balances receivable	240		264
Reinsurance recoverable on losses and loss expenses	185		478
Reinsurance recoverable on policy benefits	2		(2)
Deferred policy acquisition costs	(128)		(99)
Prepaid reinsurance premiums	(32)		(52)
Other	(77)		(21)
Net cash flows from operating activities	1,075		1,250
Cash flows from investing activities
Purchases of fixed maturities available for sale	(4,305)		(3,522)
Purchases of to be announced mortgage-backed securities	(31)		0
Purchases of fixed maturities held to maturity	(21)		(30)
Purchases of equity securities	(39)		(37)
Sales of fixed maturities available for sale	2,002		2,208
Sales of equity securities	28		27
Maturities and redemptions of fixed maturities available for sale	1,481		1,550
Maturities and redemptions of fixed maturities held to maturity	324		212
Net change in short-term investments	(255)		(765)
Net derivative instruments settlements	(51)		(96)
Other	(153)		(50)
Net cash flows used for investing activities	(1,020)		(503)
Cash flows from financing activities
Dividends paid on Common Shares	(214)		(214)
Common Shares repurchased	(347)		(335)
Policyholder contract deposits	101		51
Policyholder contract withdrawals	(40)		(14)
Proceeds from issuance of long-term debt	800		0
Proceeds from issuance of short-term debt	477		426
Repayment of short-term debt	(477)		(426)
Proceeds from share-based compensation plans, including windfall tax benefits	39		40
Other	(6)		0
Net cash flows from (used for) financing activities	333		(472)
Effect of foreign currency rate changes on cash and cash equivalents	(95)		(7)
Net increase in cash	293		268
Cash – beginning of period	655	[1],[2]	579	[3]
Cash – end of period	948	[1],[4]	847	[3]
Supplemental cash flow information
Taxes paid	96		60
Interest paid	$ 48		$ 51

[1] ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2015 and December 31, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[2] ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[3] ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2014 and December 31, 2013, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[4] ACE maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various ACE entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual ACE accounts are translated daily into a single currency and pooled on a notional basis. Individual ACE entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At March 31, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.