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Investment Securities - Investment Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Available-for-sale debt and other securities:    
Amortized Cost $ 57,372 $ 36,941
Unrealized Gains 6 1,313
Unrealized Losses (6,089) (144)
Fair Value [1] 51,289 38,110
Held-to-maturity securities:    
Amortized Cost 5 8
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 5 8
Trading debt securities 414 512
Equity securities 315 376
U.S. Treasury and federal agencies securities    
Available-for-sale debt and other securities:    
Amortized Cost 2,581 85
Unrealized Gains 0 1
Unrealized Losses (204) 0
Fair Value 2,377 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 3 6
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 3 6
Agency mortgage-backed securities | Residential mortgage backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 12,573 8,432
Unrealized Gains 0 368
Unrealized Losses (1,341) (18)
Fair Value 11,232 8,782
Agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 29,440 18,236
Unrealized Gains 1 784
Unrealized Losses (3,552) (69)
Fair Value 25,889 18,951
Non-agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 5,256 4,364
Unrealized Gains 0 128
Unrealized Losses (548) (13)
Fair Value 4,708 4,479
Asset-backed securities and other debt securities    
Available-for-sale debt and other securities:    
Amortized Cost 6,630 5,287
Unrealized Gains 5 32
Unrealized Losses (444) (44)
Fair Value 6,191 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 874 519
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 874 519
FHLB, restricted stock holdings 382 30
FRB, restricted stock holdings 490 486
DTCC, restricted stock holdings $ 2 $ 3
[1] Amortized cost of $57,372 and $36,941 at September 30, 2022 and December 31, 2021, respectively.