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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Low Income Housing Tax Credit Partnerships          
Variable Interest Entity [Line Items]          
Affordable housing tax credit investments $ 1,221   $ 1,221   $ 1,147
Less: amortization (483)   (483)   (439)
Net affordable housing tax credit investments 738   738   708
Unfunded commitments 358   358   $ 357
Tax credits and other tax benefits recognized 26 $ 23 53 $ 46  
Proportional Amortization Method          
Variable Interest Entity [Line Items]          
Proportional amortization expense included in provision for income taxes $ 22 $ 20 $ 44 $ 39