Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Commitments and Contingencies
Letters of credit and financial guarantees	$ 3,608	$ 4,355
Carrying amount of the liability for letter of credit guarantees	21	39
Investments related to affordable housing and historic building rehabilitation projects	1,371	1,302
Amount of future funding commitments included in investments related to affordable housing and historic rehabilitation projects	429	464
Lending exposure to these affordable housing projects	84	151
Tax credits subject to recapture related to affordable housing projects	284	250
Investments in private equity and similar investments	305	291
Future funding commitments to consolidated private equity funds	$ 208	$ 245

Carrying amount of the liability for letters of credit

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Outstanding commitments to fund affordable housing investments

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Future funding commitments to venture capital funds

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Investments in affordable housing and historic building rehabilitation projects

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Investments in venture capital and similar investments at fair value.

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Outstanding loan commitments to affordable housing investments

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Represents financial standby letters of credit, performance standby letters of credit, and commercial and similar letters of credit.

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Tax Credits Subject To Recapture Related To Affordable Housing Projects

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