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Investment Securities - Investment Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Available-for-sale debt and other securities:    
Amortized Cost $ 36,941 $ 34,982
Unrealized Gains 1,313 2,568
Unrealized Losses (144) (37)
Fair Value 38,110 37,513
Held-to-maturity securities:    
Amortized Cost 8 11
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 8 11
Trading debt securities 512 560
Equity securities 376 313
U.S. Treasury and federal agencies securities    
Available-for-sale debt and other securities:    
Amortized Cost 85 74
Unrealized Gains 1 4
Unrealized Losses 0 0
Fair Value 86 78
Obligations of states and political subdivisions securities    
Available-for-sale debt and other securities:    
Amortized Cost 18 17
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 18 17
Held-to-maturity securities:    
Amortized Cost 6 9
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 6 9
Agency mortgage-backed securities | Residential mortgage backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 8,432 11,147
Unrealized Gains 368 768
Unrealized Losses (18) (8)
Fair Value 8,782 11,907
Agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 18,236 16,745
Unrealized Gains 784 1,481
Unrealized Losses (69) (5)
Fair Value 18,951 18,221
Non-agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 4,364 3,323
Unrealized Gains 128 267
Unrealized Losses (13) 0
Fair Value 4,479 3,590
Asset-backed securities and other debt securities    
Available-for-sale debt and other securities:    
Amortized Cost 5,287 3,152
Unrealized Gains 32 48
Unrealized Losses (44) (24)
Fair Value 5,275 3,176
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 519 524
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 519 524
FHLB, restricted stock holdings 30 40
FRB, restricted stock holdings 486 482
DTCC, restricted stock holdings $ 3 $ 2