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Investment Securities - Investment Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Available-for-sale debt and other securities:    
Amortized Cost $ 43,754 $ 55,789
Unrealized Gains 12 9
Unrealized Losses (3,370) (5,379)
Fair Value 40,396 50,419
Held-to-maturity securities:    
Amortized Cost 11,358 2
Unrealized Gains 197 0
Unrealized Losses (1) 0
Fair Value 11,554 2
Trading debt securities 1,176 899
Equity securities 428 613
U.S. Treasury and federal agencies securities    
Available-for-sale debt and other securities:    
Amortized Cost 4,354 4,477
Unrealized Gains 0 1
Unrealized Losses (4) (142)
Fair Value 4,350 4,336
Held-to-maturity securities:    
Amortized Cost 2,354  
Unrealized Gains 25  
Unrealized Losses 0  
Fair Value 2,379  
Obligations of states and political subdivisions securities    
Available-for-sale debt and other securities:    
Amortized Cost 0 2
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 0 2
Agency mortgage-backed securities | Residential mortgage backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 5,623 11,564
Unrealized Gains 0 0
Unrealized Losses (606) (1,282)
Fair Value 5,017 10,282
Held-to-maturity securities:    
Amortized Cost 4,992  
Unrealized Gains 75  
Unrealized Losses (1)  
Fair Value 5,066  
Agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 24,008 28,945
Unrealized Gains 5 5
Unrealized Losses (2,294) (3,230)
Fair Value 21,719 25,720
Held-to-maturity securities:    
Amortized Cost 4,010  
Unrealized Gains 97  
Unrealized Losses 0  
Fair Value 4,107  
Non-agency mortgage-backed securities | Commercial mortgage-backed securities    
Available-for-sale debt and other securities:    
Amortized Cost 4,677 4,872
Unrealized Gains 2 0
Unrealized Losses (280) (427)
Fair Value 4,399 4,445
Asset-backed securities and other debt securities    
Available-for-sale debt and other securities:    
Amortized Cost 4,315 5,207
Unrealized Gains 5 3
Unrealized Losses (186) (298)
Fair Value 4,134 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 777 722
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 777 722
Held-to-maturity securities:    
FHLB, restricted stock holdings 275 224
FRB, restricted stock holdings 499 496
DTCC, restricted stock holdings $ 3 $ 2