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Investment Securities (Summary) (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | $ 46,017.0 | $ 48,568.0
Securities available for sale debt securities, unrealized gains | 214.0 | 225.0
Securities available for sale debt securities, unrealized losses | (4,444.0) | (4,634.0)
Securities available for sale debt securities, fair value | 41,787.0 | 44,159.0
Held to maturity securities, amortized cost | 93,874.0 | 95,175.0
Held-to-maturity securities, unrealized gains | 98.0 | 115.0
Held-to-maturity securities, unrealized losses | (5,076.0) | (5,011.0)
Held-to-maturity securities, fair value | 88,896.0 | 90,279.0
Accrued interest, held-to-maturity | 288.0 | 282.0
Accrued interest, available-for-sale | 143.0 | $ 144.0
Net unrealized losses, related to securities transferred at fair value to held to maturity at a point in time | $ 4,700.0 |
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 | $ 7,863.0 | $ 9,196.0
Securities available for sale debt securities, unrealized gains | 7.0 | 10.0
Securities available for sale debt securities, unrealized losses | (760.0) | (836.0)
Securities available for sale debt securities, fair value | 7,110.0 | 8,370.0
Held to maturity securities, amortized cost | 36,985.0 | 36,571.0
Held-to-maturity securities, unrealized gains | 3.0 | 6.0
Held-to-maturity securities, unrealized losses | (1,695.0) | (1,617.0)
Held-to-maturity securities, fair value | 35,293.0 | 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 | 30,867.0 | 32,114.0
Securities available for sale debt securities, unrealized gains | 6.0 | 13.0
Securities available for sale debt securities, unrealized losses | (3,218.0) | (3,304.0)
Securities available for sale debt securities, fair value | 27,655.0 | 28,823.0
Held to maturity securities, amortized cost | 44,278.0 | 45,271.0
Held-to-maturity securities, unrealized gains | 60.0 | 74.0
Held-to-maturity securities, unrealized losses | (3,119.0) | (3,095.0)
Held-to-maturity securities, fair value | 41,219.0 | 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 | 642.0 | 697.0
Securities available for sale debt securities, unrealized gains | 133.0 | 131.0
Securities available for sale debt securities, unrealized losses | (7.0) | (9.0)
Securities available for sale debt securities, fair value | 768.0 | 819.0
Held to maturity securities, amortized cost | 269.0 | 276.0
Held-to-maturity securities, unrealized gains |  |
Held-to-maturity securities, unrealized losses | (22.0) | (21.0)
Held-to-maturity securities, fair value | 247.0 | 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 | 1,759.0 | 1,845.0
Securities available for sale debt securities, unrealized gains | 1.0 |
Securities available for sale debt securities, unrealized losses | (167.0) | (170.0)
Securities available for sale debt securities, fair value | 1,593.0 | 1,675.0
Held to maturity securities, amortized cost | 839.0 | 848.0
Held-to-maturity securities, unrealized gains | 3.0 | 4.0
Held-to-maturity securities, unrealized losses | (30.0) | (26.0)
Held-to-maturity securities, fair value | 812.0 | 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 | 1,014.0 | 1,325.0
Securities available for sale debt securities, unrealized gains |  |
Securities available for sale debt securities, unrealized losses | (67.0) | (69.0)
Securities available for sale debt securities, fair value | 947.0 | 1,256.0
Held to maturity securities, amortized cost | 1,549.0 | 1,667.0
Held-to-maturity securities, unrealized gains |  |
Held-to-maturity securities, unrealized losses | (38.0) | (40.0)
Held-to-maturity securities, fair value | 1,511.0 | 1,627.0
Debt securities, available for sale, amortized cost | 141.0 | 142.0
Debt securities, held to maturity, amortized cost | 7.0 | 7.0
Asset-backed |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 910.0 | 103.0
Securities available for sale debt securities, unrealized gains | 28.0 | 27.0
Securities available for sale debt securities, unrealized losses | (4.0) | (1.0)
Securities available for sale debt securities, fair value | 934.0 | 129.0
Held to maturity securities, amortized cost | 6,645.0 | 7,188.0
Held-to-maturity securities, unrealized gains | 5.0 | 6.0
Held-to-maturity securities, unrealized losses | (112.0) | (140.0)
Held-to-maturity securities, fair value | 6,538.0 | 7,054.0
Other |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 2,962.0 | 3,288.0
Securities available for sale debt securities, unrealized gains | 39.0 | 44.0
Securities available for sale debt securities, unrealized losses | (221.0) | (245.0)
Securities available for sale debt securities, fair value | 2,780.0 | 3,087.0
Held to maturity securities, amortized cost | 3,309.0 | 3,354.0
Held-to-maturity securities, unrealized gains | 27.0 | 25.0
Held-to-maturity securities, unrealized losses | (60.0) | (72.0)
Held-to-maturity securities, fair value | $ 3,276.0 | $ 3,307.0

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