Fair Value, Changes in Fair Value of Assets Recorded at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Mortgages held for sale (LOCOM)	$ (3)	$ 33
Loans held for sale	(3)	0
Loans	(1,166)	(1,461)
Other Assets	(396)	(341)
Total	(1,568)	(1,769)
Commercial Portfolio Segment [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Loans	(165)	(125)
Consumer Portfolio Segment [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Loans	$ (1,001)	$ (1,336)

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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 Mortgages Held For Sale

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