Quarterly report pursuant to Section 13 or 15(d)

VIEs - Low Income Housing Tax Credit Partnership (Details)

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VIEs - Low Income Housing Tax Credit Partnership (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Low Income Housing Tax Credit Partnerships    
Variable Interest Entity [Line Items]    
Affordable housing tax credit investments $ 1,343 $ 1,242
Less: amortization (540) (515)
Net affordable housing tax credit investments 803 727
Unfunded commitments 386 332
Tax credits and other tax benefits recognized 29 27
Proportional Amortization Method    
Variable Interest Entity [Line Items]    
Proportional amortization expense included in provision for income taxes $ 25 $ 22