Commitments and Guarantees (Contractual Amounts of Credit-Related Off-Balance Sheet Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Indemnified securities financing	$ 346,789	$ 320,078
Stable value protection	24,484	24,906
Asset purchase agreements	4,304	4,685
Standby letters of credit	$ 4,870	$ 4,612