Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Commitments and Contingencies
Letters of credit and financial guarantees written	$ 5,205	$ 5,164
Carrying amount of the liability for letter of credit guarantees	42	30
Investments related to affordable housing and historic building rehabilitation projects	1,195	1,223
Amount of future funding commitments included in investments related to affordable housing and historic rehabilitation projects	391	461
Lending exposure to affordable housing projects	96	87
Tax credits subject to recapture related to affordable housing projects	206	193
Investments in private equity and similar investments	330	323
Future funding commitments to private equity and similar investments	$ 113	$ 129

Carrying amount of the liability for letters of credit

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Outstanding commitments to fund affordable housing investments

No definition available.

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Future funding commitments to venture capital funds

No definition available.

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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.

No definition available.

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Outstanding loan commitments to affordable housing investments

No definition available.

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

No definition available.

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Tax Credits Subject To Recapture Related To Affordable Housing Projects

No definition available.

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