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Investment Securities - Schedule of Available-for-Sale Securities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Investment securities available for sale:    
Total Amortized Cost $ 37,628 $ 40,733
Gross Unrealized Gains 485 539
Gross Unrealized Losses (458) (535)
Securities available for sale, at fair value 37,655 40,737
U.S. Treasury securities    
Investment securities available for sale:    
Total Amortized Cost 5,168 5,103
Gross Unrealized Gains 11 11
Gross Unrealized Losses (8) (49)
Securities available for sale, at fair value 5,171 5,065
RMBS    
Investment securities available for sale:    
Total Amortized Cost 27,735 29,179
Gross Unrealized Gains 460 491
Gross Unrealized Losses (403) (421)
Securities available for sale, at fair value 27,792 29,249
RMBS | Agency    
Investment securities available for sale:    
Total Amortized Cost 26,013 26,830
Gross Unrealized Gains 67 109
Gross Unrealized Losses (402) (412)
Securities available for sale, at fair value 25,678 26,527
RMBS | Non-Agency    
Investment securities available for sale:    
Total Amortized Cost 1,722 2,349
Gross Unrealized Gains 393 382
Gross Unrealized Losses (1) (9)
Securities available for sale, at fair value 2,114 2,722
Non-credit OTTI losses related to non-agency RMBS 1 9
CMBS    
Investment securities available for sale:    
Total Amortized Cost   5,011
Gross Unrealized Gains   35
Gross Unrealized Losses   (58)
Securities available for sale, at fair value   4,988
CMBS | Agency    
Investment securities available for sale:    
Total Amortized Cost 3,209 3,335
Gross Unrealized Gains 10 14
Gross Unrealized Losses (44) (45)
Securities available for sale, at fair value 3,175 3,304
CMBS | Non-Agency    
Investment securities available for sale:    
Total Amortized Cost   1,676
Gross Unrealized Gains   21
Gross Unrealized Losses   (13)
Securities available for sale, at fair value   1,684
Other ABS    
Investment securities available for sale:    
Total Amortized Cost 513 714
Gross Unrealized Gains 0 1
Gross Unrealized Losses (1) (1)
Securities available for sale, at fair value 512 714
Other securities    
Investment securities available for sale:    
Total Amortized Cost 1,003 726
Gross Unrealized Gains 4 1
Gross Unrealized Losses (2) (6)
Securities available for sale, at fair value $ 1,005 $ 721