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Investment Securities (Summary) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Available-for-sale Securities, Amortized Cost $ 45,353 $ 48,568
Securities available for sale debt securities, unrealized gains 257 225
Securities available for sale debt securities, unrealized losses (3,825) (4,634)
Securities available for sale debt securities, fair value 41,785 44,159
Held-to-maturity, Amortized costs 90,784 95,175
Held-to-maturity securities, unrealized gains 179 115
Held-to-maturity securities, unrealized losses (4,015) (5,011)
Debt Securities, Held-to-maturity, Fair Value 86,948 90,279
Accrued Interest, held-to-maturity 281 282
Accrued interest, available-for-sale $ 144 $ 144
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other Other
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other Other
Debt securities, available-for-sale, allowance for credit loss $ 86 $ 142
Debt securities, held-to-maturity, allowance for credit loss 6 7
Unrealized losses related to transfers $ (4,200) $ (5,100)
Fitch, AAA OR AA Rating | Credit Concentration Risk | Investments    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Concentration risk, percentage 97.00% 97.00%
U.S. Treasury and government agencies    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Available-for-sale Securities, Amortized Cost $ 7,596 $ 9,196
Securities available for sale debt securities, unrealized gains 22 10
Securities available for sale debt securities, unrealized losses (667) (836)
Securities available for sale debt securities, fair value 6,951 8,370
Held-to-maturity, Amortized costs 36,529 36,571
Held-to-maturity securities, unrealized gains 9 6
Held-to-maturity securities, unrealized losses (1,141) (1,617)
Debt Securities, Held-to-maturity, Fair Value 35,397 34,960
Agency    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Available-for-sale Securities, Amortized Cost 30,643 32,114
Securities available for sale debt securities, unrealized gains 46 13
Securities available for sale debt securities, unrealized losses (2,809) (3,304)
Securities available for sale debt securities, fair value 27,880 28,823
Held-to-maturity, Amortized costs 42,686 45,271
Held-to-maturity securities, unrealized gains 92 74
Held-to-maturity securities, unrealized losses (2,733) (3,095)
Debt Securities, Held-to-maturity, Fair Value 40,045 42,250
Non-agency    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Available-for-sale Securities, Amortized Cost 585 697
Securities available for sale debt securities, unrealized gains 118 131
Securities available for sale debt securities, unrealized losses (7) (9)
Securities available for sale debt securities, fair value 696 819
Held-to-maturity, Amortized costs 259 276
Held-to-maturity securities, unrealized gains
Held-to-maturity securities, unrealized losses (17) (21)
Debt Securities, Held-to-maturity, Fair Value 242 255
Agency    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Available-for-sale Securities, Amortized Cost 1,680 1,845
Securities available for sale debt securities, unrealized gains 1
Securities available for sale debt securities, unrealized losses (135) (170)
Securities available for sale debt securities, fair value 1,546 1,675
Held-to-maturity, Amortized costs 939 848
Held-to-maturity securities, unrealized gains 9 4
Held-to-maturity securities, unrealized losses (23) (26)
Debt Securities, Held-to-maturity, Fair Value 925 826
Non-agency    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Available-for-sale Securities, Amortized Cost 913 1,325
Securities available for sale debt securities, unrealized gains 1
Securities available for sale debt securities, unrealized losses (45) (69)
Securities available for sale debt securities, fair value 869 1,256
Held-to-maturity, Amortized costs 1,373 1,667
Held-to-maturity securities, unrealized gains 2
Held-to-maturity securities, unrealized losses (27) (40)
Debt Securities, Held-to-maturity, Fair Value 1,348 1,627
Asset-backed Securities    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Available-for-sale Securities, Amortized Cost 1,092 103
Securities available for sale debt securities, unrealized gains 25 27
Securities available for sale debt securities, unrealized losses (1) (1)
Securities available for sale debt securities, fair value 1,116 129
Held-to-maturity, Amortized costs 5,890 7,188
Held-to-maturity securities, unrealized gains 17 6
Held-to-maturity securities, unrealized losses (39) (140)
Debt Securities, Held-to-maturity, Fair Value 5,868 7,054
Other debt    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Available-for-sale Securities, Amortized Cost 2,844 3,288
Securities available for sale debt securities, unrealized gains 44 44
Securities available for sale debt securities, unrealized losses (161) (245)
Securities available for sale debt securities, fair value 2,727 3,087
Held-to-maturity, Amortized costs 3,108 3,354
Held-to-maturity securities, unrealized gains 50 25
Held-to-maturity securities, unrealized losses (35) (72)
Debt Securities, Held-to-maturity, Fair Value $ 3,123 $ 3,307