Commitments And Contingencies Commitments And Contingencies (Contractual Amounts of Credit-Related Off-Balance Sheet Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]
Indemnified securities financing	$ 291,075	$ 302,342
Stable Value Protection	33,512	40,963
Asset purchase agreements	5,063	5,056
Standby letters of credit	$ 4,552	$ 3,938