Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Cash flows from operating activities
Net income	$ 734		$ 953
Adjustments to reconcile net income to net cash flows from operating activities
Net realized (gains) losses	104		(206)
Amortization of premiums/discounts on fixed maturities	53		66
Deferred income taxes	0		35
Unpaid losses and loss expenses	(598)		(505)
Unearned premiums	270		267
Future policy benefits	56		44
Insurance and reinsurance balances payable	112		(41)
Accounts payable, accrued expenses, and other liabilities	(64)		144
Income taxes payable	15		29
Insurance and reinsurance balances receivable	264		(45)
Reinsurance recoverable on losses and loss expenses	478		435
Reinsurance recoverable on policy benefits	(2)		10
Deferred policy acquisition costs	(99)		(121)
Prepaid reinsurance premiums	(52)		(58)
Other	(21)		(94)
Net cash flows from operating activities	1,250		913
Cash flows from investing activities
Purchases of fixed maturities available for sale	(3,522)		(5,446)
Purchases of to be announced mortgage-backed securities	0		(19)
Purchases of fixed maturities held to maturity	(30)		(142)
Purchases of equity securities	(37)		(107)
Sales of fixed maturities available for sale	2,208		2,745
Sales of to be announced mortgage-backed securities	0		19
Sales of equity securities	27		31
Maturities and redemptions of fixed maturities available for sale	1,550		2,016
Maturities and redemptions of fixed maturities held to maturity	212		491
Net change in short-term investments	(765)		(687)
Net derivative instruments settlements	(96)		(279)
Acquisition of subsidiaries	0		(33)
Other	(50)		(55)
Net cash flows used for investing activities	(503)		(1,466)
Cash flows from financing activities
Dividends paid on Common Shares	(214)		(2)
Common Shares repurchased	(335)		(154)
Proceeds from issuance of long-term debt	0		947
Proceeds from issuance of short-term debt	426		659
Repayment of short-term debt	(426)		(658)
Proceeds from share-based compensation plans, including windfall tax benefits	40		21
Other	37		0
Net cash flows (used for) from financing activities	(472)		813
Effect of foreign currency rate changes on cash and cash equivalents	(7)		(20)
Net increase in cash	268		240
Cash – beginning of period	579	[1],[2]	615	[3]
Cash – end of period	847	[2],[4]	855	[3]
Supplemental cash flow information
Taxes paid	60		43
Interest paid	$ 51		$ 31

[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 December 31, 2013, 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 March 31, 2014 and December 31, 2013, 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, 2013 and December 31, 2012, 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, 2014, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.