Annual report pursuant to Section 13 and 15(d)

VIEs - Unconsolidated VIEs (Details)

v3.8.0.1
VIEs - Unconsolidated VIEs (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Variable Interest Entity [Line Items]    
Total Assets $ 775 $ 687
Total Liabilities 640 588
Maximum Exposure to Loss 761 673
Trust 2016 Unconsolidated    
Variable Interest Entity [Line Items]    
Total Assets 7 15
Total Liabilities 0 0
Maximum Exposure to Loss 7 15
2015-1 Automobile Trust    
Variable Interest Entity [Line Items]    
Total Assets 1 2
Total Liabilities 0 0
Maximum Exposure to Loss 1 2
Trust Preferred Securities    
Variable Interest Entity [Line Items]    
Total Assets 14 14
Total Liabilities 252 253
Maximum Exposure to Loss 0 0
Affordable Housing Tax Credit Partnerships    
Variable Interest Entity [Line Items]    
Total Assets 636 577
Total Liabilities 335 293
Maximum Exposure to Loss 636 577
Other Investments    
Variable Interest Entity [Line Items]    
Total Assets 117 79
Total Liabilities 53 42
Maximum Exposure to Loss $ 117 $ 79