Changes in Fair Value of Assets Recorded at Fair Value on Nonrecurring Basis (Details) (USD $) In Millions	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Fair Value Assets Measured On Nonrecurring Basis Increase Decrease [Line Items]
Mortgages held for sale	$ 8	$ 23
Loans held for sale	0	9
Loans	(3,613)	(6,927)
Mortgage servicing rights (amortized)	(7)	0
Other Assets	(164)	(144)
Total	(3,776)	(7,039)
Total Commercial [Member]
Fair Value Assets Measured On Nonrecurring Basis Increase Decrease [Line Items]
Loans	(684)	(1,809)
Total Consumer [Member]
Fair Value Assets Measured On Nonrecurring Basis Increase Decrease [Line Items]
Loans	$ (2,929)	$ (5,118)

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Increase Decrease In Fair Value Assets Measured On Nonrecurring Basis Loans Held For Sale

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Increase Decrease In Fair Value Assets Measured On Nonrecurring Basis Loans

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Increase decrease in fair value assets measured on nonrecurring basis mortgage servicing rights (amortized).

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Increase Decrease In Fair Value Assets Measured On Nonrecurring Basis Mortgages Held For Sale

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Increase Decrease In Fair Value Assets Measured On Nonrecurring Basis Other Assets

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