Commitments and Guarantees Contingencies (Details) (USD $) In Billions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Unfunded commitments to extend credit	$ 24.15	$ 21.30
Unfunded commitments to extend credit, short term	78.00%
Unfunded Commitment to Extend Credit, Term	1 year
Percent of fair market value that must be maintained in collateral	100.00%
Cash collateral provided for securities lending	15.78	11.29
Accrued expenses and other liabilities
Loss Contingencies [Line Items]
Cash collateral received in connection to securities finance activities	$ 7.01	$ 6.62