Commitments and Guarantees Contingencies (Details) (USD $) In Billions, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Unfunded commitments to extend credit		$ 23.15	$ 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%	100.00%
Cash collateral provided for securities lending		15.40	11.29
Accrued expenses and other liabilities
Loss Contingencies [Line Items]
Cash collateral received in connection to securities finance activities		$ 7.40	$ 6.62