Quarterly report pursuant to Section 13 or 15(d)

VIEs - Low Income Housing Tax Credit Partnerships (Details)

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VIEs - Low Income Housing Tax Credit Partnerships (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Affordable Housing Tax Credit Partnerships          
Variable Interest Entity [Line Items]          
Affordable housing tax credit investments $ 1,957   $ 1,957   $ 1,568
Less: amortization (664)   (664)   (612)
Net affordable housing tax credit investments 1,293   1,293   956
Unfunded commitments 644   644   $ 500
Tax credits and other tax benefits recognized 44 $ 30 77 $ 59  
Proportional Amortization Method          
Variable Interest Entity [Line Items]          
Proportional amortization expense included in provision for income taxes $ 30 $ 25 $ 58 $ 50