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Investment Securities - Investment Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Available-for-sale debt and other securities:    
Amortized Cost $ 50,171 $ 36,941
Unrealized Gains 180 1,313
Unrealized Losses (1,519) (144)
Fair Value [1] 48,832 38,110
Held-to-maturity securities:    
Amortized Cost 6 8
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 6 8
Trading debt securities 324 512
Equity securities 358 376
U.S. Treasury and federal agencies securities    
Available-for-sale debt and other securities:    
Amortized Cost 1,729 85
Unrealized Gains 0 1
Unrealized Losses (41) 0
Fair Value 1,688 86
Obligations of states and political subdivisions securities    
Available-for-sale debt and other securities:    
Amortized Cost 18 18
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 18 18
Held-to-maturity securities:    
Amortized Cost 4 6
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 4 6
Agency mortgage-backed securities | Residential mortgage backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 11,066 8,432
Unrealized Gains 40 368
Unrealized Losses (215) (18)
Fair Value 10,891 8,782
Agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 25,369 18,236
Unrealized Gains 120 784
Unrealized Losses (896) (69)
Fair Value 24,593 18,951
Non-agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 5,125 4,364
Unrealized Gains 5 128
Unrealized Losses (161) (13)
Fair Value 4,969 4,479
Asset-backed securities and other debt securities    
Available-for-sale debt and other securities:    
Amortized Cost 6,346 5,287
Unrealized Gains 15 32
Unrealized Losses (206) (44)
Fair Value 6,155 5,275
Held-to-maturity securities:    
Amortized Cost 2 2
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 2 2
Other securities    
Available-for-sale debt and other securities:    
Amortized Cost 518 519
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 518 519
FHLB, restricted stock holdings 30 30
FRB, restricted stock holdings 486 486
DTCC, restricted stock holdings $ 2 $ 3
[1] Amortized cost of $50,171 and $36,941 at March 31, 2022 and December 31, 2021, respectively.