Annual report pursuant to Section 13 and 15(d)

VIEs - Low Income Housing Tax Credit Partnerships (Details)

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VIEs - Low Income Housing Tax Credit Partnerships (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Affordable Housing Tax Credit Partnerships      
Variable Interest Entity [Line Items]      
Affordable housing tax credit investments $ 996 $ 877  
Less: amortization (360) (300)  
Net affordable housing tax credit investments 636 577  
Unfunded commitments 335 293  
Tax credits and other tax benefits recognized 91 80 $ 60
Proportional Amortization Method      
Variable Interest Entity [Line Items]      
Tax credit amortization expense included in provision for income taxes (1) 70 53 43
Proportional amortization method      
Tax credit amortization expense included in provision for income taxes (1) 70 53 43
Equity Method      
Equity method      
Tax credit investment losses included in noninterest income $ 0 $ 1 $ 0