Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Assets
Fixed maturities available for sale, at fair value (amortized cost - $44,666 and $40,450) (includes hybrid financial instruments of $309 and $357)	$ 47,306		$ 41,967
Fixed maturities held to maturity, at amortized cost (fair value - $7,633 and $8,605)	7,270		8,447
Equity securities, at fair value (cost - $707 and $671)	744		647
Short-term investments, at fair value and amortized cost	2,228		2,301
Other investments (cost - $2,465 and $2,112)	2,716		2,314
Total investments	60,264		55,676
Cash	615	[1],[2]	614
Securities lending collateral	1,791		1,375
Accrued investment income	552		547
Insurance and reinsurance balances receivable	4,147		4,387
Reinsurance recoverable on losses and loss expenses	12,078		12,389
Reinsurance recoverable on policy benefits	241		249
Deferred policy acquisition costs	1,873		1,548
Value of business acquired	614		676
Goodwill and other intangible assets	4,975		4,799
Prepaid reinsurance premiums	1,617		1,541
Deferred tax assets	453		673
Investments in partially-owned insurance companies (cost - $451 and $345)	454		352
Other assets	2,871		2,495
Total assets	92,545		87,321
Liabilities
Unpaid losses and loss expenses	37,946		37,477
Unearned premiums	6,864		6,334
Future policy benefits	4,470		4,274
Insurance and reinsurance balances payable	3,472		3,542
Securities lending payable	1,795		1,385
Accounts payable, accrued expenses, and other liabilities	5,377		4,898
Income taxes payable	20		159
Short-term debt	1,401		1,251
Long-term debt	3,360		3,360
Trust preferred securities	309		309
Total liabilities	65,014		62,989
Shareholders' equity
Common Shares (CHF 28.89 and CHF 30.27 par value; 342,832,412 shares issued; 340,321,534 and 336,927,276 shares outstanding)	9,591		10,095
Common Shares in treasury (2,510,878 and 5,905,136 shares)	(159)		(327)
Additional paid-in capital	5,179		5,326
Retained earnings	10,033		7,327
Accumulated other comprehensive income (AOCI)	2,887		1,911
Total shareholders' equity	27,531		24,332
Total liabilities and shareholders' equity	$ 92,545		$ 87,321

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

[2] 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.