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Investment Securities (Summary) (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | $ 54,896 | $ 45,353
Securities available for sale debt securities, unrealized gains | 202 | 257
Securities available for sale debt securities, unrealized losses | (3,910) | (3,825)
Securities available for sale debt securities, fair value | 51,188 | 41,785
Held to maturity securities, amortized cost | 87,457 | 90,784
Held-to-maturity securities, unrealized gains | 62 | 179
Held-to-maturity securities, unrealized losses | (5,264) | (4,015)
Held-to-maturity securities, fair value | 82,255 | 86,948
Accrued interest, held-to-maturity | 268 | 281
Accrued interest, available-for-sale | 252 | 144
Debt securities, available for sale, amortized cost | 88 | 86
Debt securities, held to maturity, amortized cost | 5 | 6
Net unrealized losses, related to securities transferred at fair value to held to maturity at a point in time | $ 3,800 | $ 4,200
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] |  |
Securities available for sale debt securities, amortized cost | $ 16,868 | $ 7,596
Securities available for sale debt securities, unrealized gains | 19 | 22
Securities available for sale debt securities, unrealized losses | (413) | (667)
Securities available for sale debt securities, fair value | 16,474 | 6,951
Held to maturity securities, amortized cost | 35,468 | 36,529
Held-to-maturity securities, unrealized gains |  | 9
Held-to-maturity securities, unrealized losses | (1,302) | (1,141)
Held-to-maturity securities, fair value | 34,166 | 35,397
Agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 30,234 | 30,643
Securities available for sale debt securities, unrealized gains | 15 | 46
Securities available for sale debt securities, unrealized losses | (3,153) | (2,809)
Securities available for sale debt securities, fair value | 27,096 | 27,880
Held to maturity securities, amortized cost | 41,865 | 42,686
Held-to-maturity securities, unrealized gains | 13 | 92
Held-to-maturity securities, unrealized losses | (3,805) | (2,733)
Held-to-maturity securities, fair value | 38,073 | 40,045
Non-agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 534 | 585
Securities available for sale debt securities, unrealized gains | 99 | 118
Securities available for sale debt securities, unrealized losses | (9) | (7)
Securities available for sale debt securities, fair value | 624 | 696
Held to maturity securities, amortized cost | 250 | 259
Held-to-maturity securities, unrealized gains |  |
Held-to-maturity securities, unrealized losses | (23) | (17)
Held-to-maturity securities, fair value | 227 | 242
Agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 1,758 | 1,680
Securities available for sale debt securities, unrealized gains |  | 1
Securities available for sale debt securities, unrealized losses | (141) | (135)
Securities available for sale debt securities, fair value | 1,617 | 1,546
Held to maturity securities, amortized cost | 956 | 939
Held-to-maturity securities, unrealized gains | 2 | 9
Held-to-maturity securities, unrealized losses | (31) | (23)
Held-to-maturity securities, fair value | 927 | 925
Non-agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 824 | 913
Securities available for sale debt securities, unrealized gains | 1 | 1
Securities available for sale debt securities, unrealized losses | (28) | (45)
Securities available for sale debt securities, fair value | 797 | 869
Held to maturity securities, amortized cost | 1,189 | 1,373
Held-to-maturity securities, unrealized gains | 2 | 2
Held-to-maturity securities, unrealized losses | (17) | (27)
Held-to-maturity securities, fair value | 1,174 | 1,348
Asset-backed |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 2,097 | 1,092
Securities available for sale debt securities, unrealized gains | 27 | 25
Securities available for sale debt securities, unrealized losses | (4) | (1)
Securities available for sale debt securities, fair value | 2,120 | 1,116
Held to maturity securities, amortized cost | 4,833 | 5,890
Held-to-maturity securities, unrealized gains | 22 | 17
Held-to-maturity securities, unrealized losses | (30) | (39)
Held-to-maturity securities, fair value | 4,825 | 5,868
Other |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 2,581 | 2,844
Securities available for sale debt securities, unrealized gains | 41 | 44
Securities available for sale debt securities, unrealized losses | (162) | (161)
Securities available for sale debt securities, fair value | 2,460 | 2,727
Held to maturity securities, amortized cost | 2,896 | 3,108
Held-to-maturity securities, unrealized gains | 23 | 50
Held-to-maturity securities, unrealized losses | (56) | (35)
Held-to-maturity securities, fair value | $ 2,863 | $ 3,123

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