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Investment Securities - Investment Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Available-for-sale debt and other securities:    
Amortized Cost $ 43,400 $ 55,789
Unrealized Gains 5 9
Unrealized Losses (4,614) (5,379)
Fair Value [1] 38,791 50,419
Held-to-maturity securities:    
Amortized Cost [2] 11,520 2
Unrealized Gains 4 0
Unrealized Losses (183) 0
Fair Value 11,341 2
Trading debt securities 1,151 899
Equity securities 380 613
U.S. Treasury and federal agencies securities    
Available-for-sale debt and other securities:    
Amortized Cost 2,773 4,477
Unrealized Gains 1 1
Unrealized Losses 0 (142)
Fair Value 2,774 4,336
Held-to-maturity securities:    
Amortized Cost 2,321  
Unrealized Gains 0  
Unrealized Losses (29)  
Fair Value 2,292  
Obligations of states and political subdivisions securities    
Available-for-sale debt and other securities:    
Amortized Cost 2 2
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 2 2
Agency mortgage-backed securities | Residential mortgage backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 5,630 11,564
Unrealized Gains 0 0
Unrealized Losses (779) (1,282)
Fair Value 4,851 10,282
Held-to-maturity securities:    
Amortized Cost 5,194  
Unrealized Gains 0  
Unrealized Losses (109)  
Fair Value 5,085  
Agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 24,445 28,945
Unrealized Gains 1 5
Unrealized Losses (3,163) (3,230)
Fair Value 21,283 25,720
Held-to-maturity securities:    
Amortized Cost 4,003  
Unrealized Gains 4  
Unrealized Losses (45)  
Fair Value 3,962  
Non-agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 4,837 4,872
Unrealized Gains 0 0
Unrealized Losses (403) (427)
Fair Value 4,434 4,445
Asset-backed securities and other debt securities    
Available-for-sale debt and other securities:    
Amortized Cost 4,913 5,207
Unrealized Gains 3 3
Unrealized Losses (269) (298)
Fair Value 4,647 4,912
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 800 722
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 800 722
Held-to-maturity securities:    
FHLB, restricted stock holdings 301 224
FRB, restricted stock holdings 496 496
DTCC, restricted stock holdings $ 3 $ 2
[1] Amortized cost of $43,400 and $55,789 at March 31, 2024 and December 31, 2023, respectively.
[2] Fair value of $11,341 and $2 at March 31, 2024 and December 31, 2023, respectively.