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, 2019
Dec. 31, 2018
Dec. 31, 2017
Affordable Housing Tax Credit Partnerships      
Variable Interest Entity [Line Items]      
Affordable Housing Tax Credits and Other Tax Benefits, Amount $ 98 $ 92 $ 91
Affordable housing tax credit investments 1,242 1,147  
Less: amortization (515) (439)  
Net affordable housing tax credit investments 727 708  
Unfunded commitments 332 357  
Proportional Amortization Method      
Variable Interest Entity [Line Items]      
Proportional amortization expense included in provision for income taxes 84 79 70
Proportional amortization method      
Proportional amortization expense included in provision for income taxes $ 84 $ 79 $ 70