Commitments and Contingencies (Narrative) (Details) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Carrying amount of the liability for letters of credit	$ 35,000,000	$ 41,000,000
Investments in affordable housing and historic building rehabilitation projects	1,200,000,000	1,200,000,000
Commitments to fund affordable housing investments	278,000,000	334,000,000
Outstanding loan commitments for affordable housing and historic rehabilitation projects	144,000,000	135,000,000
Outstanding loan balance for affordable housing and historic rehabilitation projects	69,000,000	36,000,000
Maximum risk exposure related to affordable housing and historic rehabilitation projects	1,300,000,000	1,300,000,000
Investments in venture capital funds	276,000,000	266,000,000
Future funding commitments	152,000,000	185,000,000
Notional/Contract Amount [Member]
Standby and commercial letters of credit	6,316,000,000	7,291,000,000
Commitments to fund affordable housing investments	278,000,000	334,000,000
Fair Value [Member]
Standby and commercial letters of credit	35,000,000	41,000,000
Commitments to fund affordable housing investments	$ 263,000,000	$ 316,000,000

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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Maximum risk exposure related to affordable housing and historic rehabilitation projects

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Amounts funded to affordable housing investments under outstanding loan commitments

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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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