Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Nonrecurring Fair Value Inputs (Details)

v3.6.0.2
Fair Value Measurements - Nonrecurring Fair Value Inputs (Details) - Nonrecurring - Level 3 - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Market Comparables | Minimum    
Fair Value Inputs [Abstract]    
OREO discount 8.00% 7.00%
Cost to sell 7.00% 8.00%
Market Comparables | Maximum    
Fair Value Inputs [Abstract]    
OREO discount 56.00% 55.00%
Cost to sell 45.00% 45.00%
Instruments backed by residential real estate assets    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, fair value $ 1,416 $ 2,739
Instruments backed by residential real estate assets | Market Comparables | Weighted Average    
Fair Value Inputs [Abstract]    
OREO discount 21.00% 20.00%
Cost to sell 9.00% 10.00%