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Investment Securities - Investment Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Available-for-sale debt and other securities:    
Amortized Cost $ 43,596 $ 55,789
Unrealized Gains 7 9
Unrealized Losses (4,617) (5,379)
Fair Value 38,986 50,419
Held-to-maturity securities:    
Amortized Cost 11,443 2
Unrealized Gains 4 0
Unrealized Losses (260) 0
Fair Value 11,187 2
Trading debt securities 1,132 899
Equity securities 476 613
U.S. Treasury and federal agencies securities    
Available-for-sale debt and other securities:    
Amortized Cost 3,504 4,477
Unrealized Gains 2 1
Unrealized Losses 0 (142)
Fair Value 3,506 4,336
Held-to-maturity securities:    
Amortized Cost 2,338  
Unrealized Gains 0  
Unrealized Losses (39)  
Fair Value 2,299  
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 5,556 11,564
Unrealized Gains 0 0
Unrealized Losses (799) (1,282)
Fair Value 4,757 10,282
Held-to-maturity securities:    
Amortized Cost 5,092  
Unrealized Gains 0  
Unrealized Losses (160)  
Fair Value 4,932  
Agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 24,315 28,945
Unrealized Gains 0 5
Unrealized Losses (3,160) (3,230)
Fair Value 21,155 25,720
Held-to-maturity securities:    
Amortized Cost 4,011  
Unrealized Gains 4  
Unrealized Losses (61)  
Fair Value 3,954  
Non-agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 4,816 4,872
Unrealized Gains 0 0
Unrealized Losses (413) (427)
Fair Value 4,403 4,445
Asset-backed securities and other debt securities    
Available-for-sale debt and other securities:    
Amortized Cost 4,609 5,207
Unrealized Gains 5 3
Unrealized Losses (245) (298)
Fair Value 4,369 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 794 722
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 794 722
Held-to-maturity securities:    
FHLB, restricted stock holdings 293 224
FRB, restricted stock holdings 499 496
DTCC, restricted stock holdings $ 2 $ 2