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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

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