Quarterly report pursuant to Section 13 or 15(d)

VIEs - Low Income Housing Tax Credit Partnership (Details)

v3.10.0.1
VIEs - Low Income Housing Tax Credit Partnership (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Low Income Housing Tax Credit Partnerships          
Variable Interest Entity [Line Items]          
Affordable housing tax credit investments $ 1,024   $ 1,024   $ 996
Less: amortization (399)   (399)   (360)
Net affordable housing tax credit investments 625   625   636
Unfunded commitments 293   293   $ 335
Tax credits and other tax benefits recognized 23 $ 23 46 $ 46  
Proportional Amortization Method          
Variable Interest Entity [Line Items]          
Tax credit amortization expense included in provision for income taxes $ 20 $ 17 $ 39 $ 34