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Investment Securities - AFS and HTM Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
AFS securities    
Amortized Cost $ 89,558 $ 102,515
Gross Unrealized Gains 27 954
Gross Unrealized Losses 5,952 639
Fair  Value 83,633 102,830
HTM securities    
Amortized Cost 77,636 80,168
Gross Unrealized Gains 0 1,079
Gross Unrealized Losses 11,243 1,365
Fair  Value 66,393 79,882
Amortized cost 167,194 182,683
Gross Unrealized Gains 27 2,033
Gross Unrealized Losses 17,195 2,004
Fair  Value 150,026 182,712
U.S. Treasury securities    
AFS securities    
Amortized Cost 56,113 58,974
Gross Unrealized Gains 9 343
Gross Unrealized Losses 2,504 296
Fair  Value 53,618 59,021
HTM securities    
Amortized Cost 29,589 28,653
Gross Unrealized Gains 0 882
Gross Unrealized Losses 1,932 81
Fair  Value 27,657 29,454
U.S. agency securities    
AFS securities    
Amortized Cost 23,918 26,780
Gross Unrealized Gains 1 274
Gross Unrealized Losses 2,879 241
Fair  Value 21,040 26,813
HTM securities    
Amortized Cost 44,945 48,195
Gross Unrealized Gains 0 169
Gross Unrealized Losses 9,006 1,228
Fair  Value 35,939 47,136
Agency CMBS    
AFS securities    
Amortized Cost 6,144 14,476
Gross Unrealized Gains 3 289
Gross Unrealized Losses 449 89
Fair  Value 5,698 14,676
HTM securities    
Amortized Cost 1,954 2,267
Gross Unrealized Gains 0 0
Gross Unrealized Losses 172 51
Fair  Value 1,782 2,216
Non-agency CMBS    
HTM securities    
Amortized Cost 1,148 1,053
Gross Unrealized Gains 0 28
Gross Unrealized Losses 133 5
Fair  Value 1,015 1,076
State and municipal securities    
AFS securities    
Amortized Cost 2,170 613
Gross Unrealized Gains 14 37
Gross Unrealized Losses 90 2
Fair  Value 2,094 648
FFELP student loan ABS:    
AFS securities    
Amortized Cost 1,213 1,672
Gross Unrealized Gains 0 11
Gross Unrealized Losses 30 11
Fair  Value $ 1,183 $ 1,672
HTM securities    
Third party guarantees (as a percent) 95.00%