Commitments and Guarantees Contingencies (Details) (USD $) In Billions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Cash collateral provided for securities lending	$ 11.32	$ 11.29
Percent of fair market value that must be maintained in collateral	100.00%
Unfunded commitments to extend credit	21.77	21.30
Unfunded commitments to extend credit, short term	77.00%
Accrued expenses and other liabilities
Loss Contingencies [Line Items]
Cash collateral received in connection to securities finance activities	$ 6.29	$ 6.62