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
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Affordable Housing Tax Credit Partnerships      
Variable Interest Entity [Line Items]      
Affordable Housing Tax Credits and Other Tax Benefits, Amount $ 92 $ 91 $ 80
Affordable housing tax credit investments 1,147 996  
Less: amortization (439) (360)  
Net affordable housing tax credit investments 708 636  
Unfunded commitments 357 335  
Proportional Amortization Method      
Variable Interest Entity [Line Items]      
Tax credit amortization expense included in provision for income taxes 79 70 53
Proportional amortization method      
Tax credit amortization expense included in provision for income taxes 79 70 53
Equity Method      
Equity method      
Tax credit investment losses included in noninterest income $ 0 $ 0 $ 1