Fair Value, Changes in Fair Value of Assets Recorded at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Mortgages held for sale (LOCOM)	$ 18	$ 57
Loans held for sale	(1)	0
Loans	(675)	(853)
Other assets	(152)	(205)
Total	(810)	(1,001)
Total Commercial [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Loans	(74)	(72)
Total Consumer [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Loans	$ (601)	$ (781)

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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 Mortgages Held For Sale

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