Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Assets
Fixed maturities available for sale, at fair value (amortized cost - $41,661 and $40,450) (includes hybrid financial instruments of $400 and $357)	$ 43,468	$ 41,967
Fixed maturities held to maturity, at amortized cost (fair value - $8,348 and $8,605)	8,117	8,447
Equity securities, at fair value (cost - $662 and $671)	679	647
Short-term investments, at fair value and amortized cost	2,099	2,301
Other investments (cost - $2,221 and $2,112)	2,429	2,314
Total investments	56,792	55,676
Cash	715	614
Securities lending collateral	2,204	1,375
Accrued investment income	561	547
Insurance and reinsurance balances receivable	4,487	4,387
Reinsurance recoverable on losses and loss expenses	12,057	12,389
Reinsurance recoverable on policy benefits	243	249
Deferred policy acquisition costs	1,649	1,548
Value of business acquired	669	676
Goodwill and other intangible assets	4,860	4,799
Prepaid reinsurance premiums	1,643	1,541
Deferred tax assets	568	673
Investments in partially-owned insurance companies (cost - $339 and $345)	346	352
Other assets	2,955	2,495
Total assets	89,749	87,321
Liabilities
Unpaid losses and loss expenses	37,247	37,477
Unearned premiums	6,664	6,334
Future policy benefits	4,358	4,274
Insurance and reinsurance balances payable	3,454	3,542
Deposit liabilities	690	663
Securities lending payable	2,211	1,385
Payable for securities purchased	569	287
Accounts payable, accrued expenses, and other liabilities	3,724	3,948
Income taxes payable	201	159
Short-term debt	1,531	1,251
Long-term debt	3,360	3,360
Trust preferred securities	309	309
Total liabilities	64,318	62,989
Commitments and contingencies
Shareholders' equity
Common Shares (CHF 30.27 par value; 342,832,412 shares issued; 338,653,382 and 336,927,276 shares outstanding)	10,095	10,095
Common Shares in treasury (4,179,030 and 5,905,136 shares)	(227)	(327)
Additional paid-in capital	5,054	5,326
Retained earnings	8,300	7,327
Accumulated other comprehensive income (AOCI)	2,209	1,911
Total shareholders' equity	25,431	24,332
Total liabilities and shareholders' equity	$ 89,749	$ 87,321