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Investment Securities - AFS and HTM Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
AFS securities    
Amortized Cost $ 62,896 $ 62,275
Gross Unrealized Gains 488 62
Gross Unrealized Losses 346 1,276
Fair Value 63,038 61,061
HTM securities    
Amortized Cost 40,028 30,771
Gross Unrealized Gains 646 52
Gross Unrealized Losses 155 858
Fair Value 40,519 29,965
Amortized Cost 102,924 93,046
Gross Unrealized Gains 1,134 114
Gross Unrealized Losses 501 2,134
Fair Value 103,557 91,026
U.S. Treasury and agency securities    
AFS securities    
Amortized Cost 55,903 57,008
Gross Unrealized Gains 406 50
Gross Unrealized Losses 285 1,153
Fair Value 56,024 55,905
HTM securities    
Amortized Cost 39,444 30,288
Gross Unrealized Gains 626 52
Gross Unrealized Losses 155 849
Fair Value 39,915 29,491
U.S. Treasury securities    
AFS securities    
Amortized Cost 32,931 36,268
Gross Unrealized Gains 218 40
Gross Unrealized Losses 159 656
Fair Value 32,990 35,652
HTM securities    
Amortized Cost 25,232 17,832
Gross Unrealized Gains 509 44
Gross Unrealized Losses 69 403
Fair Value 25,672 17,473
U.S. agency securities    
AFS securities    
Amortized Cost 22,972 20,740
Gross Unrealized Gains 188 10
Gross Unrealized Losses 126 497
Fair Value 23,034 20,253
HTM securities    
Amortized Cost 14,212 12,456
Gross Unrealized Gains 117 8
Gross Unrealized Losses 86 446
Fair Value 14,243 12,018
Corporate and other debt    
AFS securities    
Amortized Cost 6,993 5,267
Gross Unrealized Gains 82 12
Gross Unrealized Losses 61 123
Fair Value 7,014 5,156
HTM securities    
Amortized Cost 584  
Fair Value 604  
Agency CMBS    
AFS securities    
Amortized Cost 2,888 1,054
Gross Unrealized Gains 57 0
Gross Unrealized Losses 37 62
Fair Value 2,908 992
Non-agency CMBS    
AFS securities    
Amortized Cost 220 461
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2 14
Fair Value 218 447
HTM securities    
Amortized Cost 584 483
Gross Unrealized Gains 20 0
Gross Unrealized Losses 0 9
Fair Value 604 474
Auto loan ABS    
AFS securities    
Amortized Cost 4  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value 4  
Corporate bonds    
AFS securities    
Amortized Cost 1,842 1,585
Gross Unrealized Gains 10 0
Gross Unrealized Losses 5 32
Fair Value 1,847 1,553
State and municipal securities    
AFS securities    
Amortized Cost 333 200
Gross Unrealized Gains 10 2
Gross Unrealized Losses 0 0
Fair Value 343 202
FFELP Student Loan ABS    
AFS securities    
Amortized Cost 1,706 1,967
Gross Unrealized Gains 5 10
Gross Unrealized Losses 17 15
Fair Value $ 1,694 $ 1,962
HTM securities    
Third party guarantees (as a percent) 95.00%