Quarterly report pursuant to Section 13 or 15(d)

VIEs - Low Income Housing Tax Credit Partnership (Details)

v3.8.0.1
VIEs - Low Income Housing Tax Credit Partnership (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Low Income Housing Tax Credit Partnerships      
Variable Interest Entity [Line Items]      
Affordable housing tax credit investments $ 1,013   $ 996
Less: amortization (379)   (360)
Net affordable housing tax credit investments 634   636
Unfunded commitments 320   $ 335
Tax credits and other tax benefits recognized 23 $ 23  
Proportional Amortization Method      
Variable Interest Entity [Line Items]      
Tax credit amortization expense included in provision for income taxes $ 19 $ 17