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Investment Securities - Investment Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Available-for-sale debt and other securities:    
Amortized Cost $ 55,958 $ 57,530
Unrealized Gains 19 19
Unrealized Losses (5,258) (6,046)
Fair Value [1] 50,719 51,503
Held-to-maturity securities:    
Amortized Cost [2] 2 5
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 2 5
Trading debt securities 1,174 414
Equity securities 323 317
U.S. Treasury and federal agencies securities    
Available-for-sale debt and other securities:    
Amortized Cost 2,828 2,683
Unrealized Gains 1 0
Unrealized Losses (140) (188)
Fair Value 2,689 2,495
Obligations of states and political subdivisions securities    
Available-for-sale debt and other securities:    
Amortized Cost 3 18
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 3 18
Held-to-maturity securities:    
Amortized Cost   3
Unrealized Gains   0
Unrealized Losses   0
Fair Value   3
Agency mortgage-backed securities | Residential mortgage backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 12,246 12,604
Unrealized Gains 6 5
Unrealized Losses (1,179) (1,372)
Fair Value 11,073 11,237
Agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 29,231 29,824
Unrealized Gains 10 11
Unrealized Losses (3,058) (3,513)
Fair Value 26,183 26,322
Non-agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 5,057 5,235
Unrealized Gains 0 0
Unrealized Losses (507) (520)
Fair Value 4,550 4,715
Asset-backed securities and other debt securities    
Available-for-sale debt and other securities:    
Amortized Cost 5,703 6,292
Unrealized Gains 2 3
Unrealized Losses (374) (453)
Fair Value 5,331 5,842
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 890 874
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 890 874
FHLB, restricted stock holdings 396 381
FRB, restricted stock holdings 491 491
DTCC, restricted stock holdings $ 3 $ 2
[1] Amortized cost of $55,958 and $57,530 at March 31, 2023 and December 31, 2022, respectively.
[2] Fair value of $2 and $5 at March 31, 2023 and December 31, 2022, respectively.