Commitments and Guarantees - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Unfunded commitments to extend credit	$ 22,580	$ 24,250
Unfunded commitments to extend credit, short term	76.00%
Term of unfunded commitment	1 year
Cash collateral provided for securities lending	$ 20,120	15,940
Accrued expenses and other liabilities
Loss Contingencies [Line Items]
Cash collateral received in connection to securities finance activities	$ 3,270	$ 6,480