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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Commitments and Contingencies    
Letters of credit and financial guarantees $ 3,935 $ 4,355
Carrying amount of the liability for letter of credit guarantees 38 39
Investments related to affordable housing and historic building rehabilitation projects 1,326 1,302
Amount of future funding commitments included in investments related to affordable housing and historic rehabilitation projects 404 464
Lending exposure to these affordable housing projects 89 151
Tax credits subject to recapture related to affordable housing projects 269 250
Investments in private equity and similar investments 322 291
Future funding commitments to consolidated private equity funds $ 207 $ 245