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Investment Securities - Investment Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Available-for-sale debt and other securities:    
Amortized Cost $ 55,557 $ 57,530
Unrealized Gains 4 19
Unrealized Losses (7,668) (6,046)
Fair Value [1] 47,893 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 1,222 414
Equity securities 250 317
U.S. Treasury and federal agencies securities    
Available-for-sale debt and other securities:    
Amortized Cost 3,680 2,683
Unrealized Gains 1 0
Unrealized Losses (219) (188)
Fair Value 3,462 2,495
Obligations of states and political subdivisions securities    
Available-for-sale debt and other securities:    
Amortized Cost 2 18
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 2 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 11,743 12,604
Unrealized Gains 0 5
Unrealized Losses (1,867) (1,372)
Fair Value 9,876 11,237
Agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 29,055 29,824
Unrealized Gains 0 11
Unrealized Losses (4,594) (3,513)
Fair Value 24,461 26,322
Non-agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 4,922 5,235
Unrealized Gains 0 0
Unrealized Losses (597) (520)
Fair Value 4,325 4,715
Asset-backed securities and other debt securities    
Available-for-sale debt and other securities:    
Amortized Cost 5,378 6,292
Unrealized Gains 3 3
Unrealized Losses (391) (453)
Fair Value 4,990 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 777 874
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 777 874
FHLB, restricted stock holdings 281 381
FRB, restricted stock holdings 494 491
DTCC, restricted stock holdings $ 2 $ 2
[1] Amortized cost of $55,557 and $57,530 at September 30, 2023 and December 31, 2022, respectively.
[2] Fair value of $2 and $5 at September 30, 2023 and December 31, 2022, respectively.