Commitments and Guarantees - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Loss Contingencies [Line Items]
Unfunded commitments to extend credit, short term	73.00%
Term of unfunded commitment	1 year
Cash collateral provided for securities lending	$ 21,200	$ 20,120
Accrued expenses and other liabilities
Loss Contingencies [Line Items]
Cash collateral received in connection to securities finance activities	$ 5,020	$ 3,270