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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Low Income Housing Tax Credit Partnerships          
Variable Interest Entity [Line Items]          
Affordable housing tax credit investments $ 1,219   $ 1,219   $ 1,147
Less: amortization (505)   (505)   (439)
Net affordable housing tax credit investments 714   714   708
Unfunded commitments 338   338   $ 357
Tax credits and other tax benefits recognized 26 $ 24 79 $ 70  
Proportional Amortization Method          
Variable Interest Entity [Line Items]          
Proportional amortization expense included in provision for income taxes $ 22 $ 19 $ 66 $ 59