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Commitments and Guarantees - Contractual Amounts of Credit-Related Off-Balance Sheet Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]    
Indemnified securities financing $ 331,552 $ 349,766
Stable value protection 23,280 23,409
Asset purchase agreements 4,210 4,107
Standby letters of credit $ 4,966 $ 4,720