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Investment Securities (Summary) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | $ 46,977.0 | $ 48,568.0
Securities available for sale debt securities, unrealized gains | 231.0 | 225.0
Securities available for sale debt securities, unrealized losses | (3,988.0) | (4,634.0)
Securities available for sale debt securities, fair value | 43,220.0 | 44,159.0
Held to maturity securities, amortized cost | 95,019.0 | 95,175.0
Held-to-maturity securities, unrealized gains | 229.0 | 115.0
Held-to-maturity securities, unrealized losses | (3,823.0) | (5,011.0)
Held-to-maturity securities, fair value | 91,425.0 | 90,279.0
Accrued interest, held-to-maturity | 257.0 | 282.0
Accrued interest, available-for-sale | 135.0 | $ 144.0
Net unrealized losses, related to securities transferred at fair value to held to maturity at a point in time | $ 4,900.0 |
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 | $ 8,453.0 | $ 9,196.0
Securities available for sale debt securities, unrealized gains | 14.0 | 10.0
Securities available for sale debt securities, unrealized losses | (720.0) | (836.0)
Securities available for sale debt securities, fair value | 7,747.0 | 8,370.0
Held to maturity securities, amortized cost | 36,838.0 | 36,571.0
Held-to-maturity securities, unrealized gains | 32.0 | 6.0
Held-to-maturity securities, unrealized losses | (1,162.0) | (1,617.0)
Held-to-maturity securities, fair value | 35,708.0 | 34,960.0
Residential mortgage-backed | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 31,510.0 | 32,114.0
Securities available for sale debt securities, unrealized gains | 25.0 | 13.0
Securities available for sale debt securities, unrealized losses | (2,840.0) | (3,304.0)
Securities available for sale debt securities, fair value | 28,695.0 | 28,823.0
Held to maturity securities, amortized cost | 45,191.0 | 45,271.0
Held-to-maturity securities, unrealized gains | 134.0 | 74.0
Held-to-maturity securities, unrealized losses | (2,455.0) | (3,095.0)
Held-to-maturity securities, fair value | 42,870.0 | 42,250.0
Residential mortgage-backed | Mortgage-backed Securities Non-agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 675.0 | 697.0
Securities available for sale debt securities, unrealized gains | 123.0 | 131.0
Securities available for sale debt securities, unrealized losses | (11.0) | (9.0)
Securities available for sale debt securities, fair value | 787.0 | 819.0
Held to maturity securities, amortized cost | 272.0 | 276.0
Held-to-maturity securities, unrealized gains |  |
Held-to-maturity securities, unrealized losses | (19.0) | (21.0)
Held-to-maturity securities, fair value | 253.0 | 255.0
Commercial mortgage-backed | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 1,852.0 | 1,845.0
Securities available for sale debt securities, unrealized gains | 1.0 |
Securities available for sale debt securities, unrealized losses | (148.0) | (170.0)
Securities available for sale debt securities, fair value | 1,705.0 | 1,675.0
Held to maturity securities, amortized cost | 822.0 | 848.0
Held-to-maturity securities, unrealized gains | 10.0 | 4.0
Held-to-maturity securities, unrealized losses | (19.0) | (26.0)
Held-to-maturity securities, fair value | 813.0 | 826.0
Commercial mortgage-backed | Mortgage-backed Securities Non-agency |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 1,020.0 | 1,325.0
Securities available for sale debt securities, unrealized gains |  |
Securities available for sale debt securities, unrealized losses | (65.0) | (69.0)
Securities available for sale debt securities, fair value | 955.0 | 1,256.0
Held to maturity securities, amortized cost | 1,604.0 | 1,667.0
Held-to-maturity securities, unrealized gains | 1.0 |
Held-to-maturity securities, unrealized losses | (31.0) | (40.0)
Held-to-maturity securities, fair value | 1,574.0 | 1,627.0
Debt securities, available for sale, amortized cost | 142.0 | 142.0
Debt securities, held to maturity, amortized cost | 6.0 | 7.0
Asset-backed |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 393.0 | 103.0
Securities available for sale debt securities, unrealized gains | 28.0 | 27.0
Securities available for sale debt securities, unrealized losses | (2.0) | (1.0)
Securities available for sale debt securities, fair value | 419.0 | 129.0
Held to maturity securities, amortized cost | 6,884.0 | 7,188.0
Held-to-maturity securities, unrealized gains | 13.0 | 6.0
Held-to-maturity securities, unrealized losses | (97.0) | (140.0)
Held-to-maturity securities, fair value | 6,800.0 | 7,054.0
Other |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 3,074.0 | 3,288.0
Securities available for sale debt securities, unrealized gains | 40.0 | 44.0
Securities available for sale debt securities, unrealized losses | (202.0) | (245.0)
Securities available for sale debt securities, fair value | 2,912.0 | 3,087.0
Held to maturity securities, amortized cost | 3,408.0 | 3,354.0
Held-to-maturity securities, unrealized gains | 39.0 | 25.0
Held-to-maturity securities, unrealized losses | (40.0) | (72.0)
Held-to-maturity securities, fair value | $ 3,407.0 | $ 3,307.0

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