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Investment Securities (Summary) (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | $ 55,975.0 | $ 130,798.0
Securities available for sale debt securities, unrealized gains | 276.0 | 1,566.0
Securities available for sale debt securities, unrealized losses | (3,267.0) | (828.0)
Securities available for sale debt securities, fair value | 52,984.0 | 131,536.0
Held to maturity securities, amortized cost | 79,748.0 | 1,426.0
Held-to-maturity securities, unrealized gains | 38.0 | 103.0
Held-to-maturity securities, unrealized losses | (1,372.0) | (7.0)
Held-to-maturity securities, fair value | 78,414.0 | 1,522.0
Accrued interest, held-to-maturity | 191.0 | 5.0
Accrued interest, available-for-sale | 162.0 | 322.0
Debt securities, available-for-sale, allowance for credit loss | 133.0 | 130.0
Debt securities, held-to-maturity, allowance for credit loss | 4.0 | $ 3.0
Net unrealized losses, related to securities transferred at fair value to held to maturity at a point in time | $ 5,400.0 |
Fitch, AAA OR AA Rating | Credit Concentration Risk | Held-to-maturity Securities |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Concentration risk, percentage | 99.00% | 86.00%
U.S. Treasury and government agencies |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | $ 13,877.0 | $ 46,210.0
Securities available for sale debt securities, unrealized gains | 15.0 | 324.0
Securities available for sale debt securities, unrealized losses | (849.0) | (370.0)
Securities available for sale debt securities, fair value | 13,043.0 | 46,164.0
Held to maturity securities, amortized cost | 31,582.0 | 814.0
Held-to-maturity securities, unrealized gains | 13.0 | 76.0
Held-to-maturity securities, unrealized losses | (407.0) |
Held-to-maturity securities, fair value | 31,188.0 | 890.0
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 | 34,240.0 | 67,326.0
Securities available for sale debt securities, unrealized gains | 13.0 | 695.0
Securities available for sale debt securities, unrealized losses | (2,074.0) | (389.0)
Securities available for sale debt securities, fair value | 32,179.0 | 67,632.0
Held to maturity securities, amortized cost | 36,880.0 |
Held-to-maturity securities, unrealized gains | 8.0 |
Held-to-maturity securities, unrealized losses | (840.0) |
Held-to-maturity securities, fair value | 36,048.0 |
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 | 762.0 | 927.0
Securities available for sale debt securities, unrealized gains | 167.0 | 231.0
Securities available for sale debt securities, unrealized losses | (4.0) |
Securities available for sale debt securities, fair value | 925.0 | 1,158.0
Held to maturity securities, amortized cost | 288.0 |
Held-to-maturity securities, unrealized losses | (6.0) |
Held-to-maturity securities, fair value | 282.0 |
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 | 2,040.0 | 1,740.0
Securities available for sale debt securities, unrealized gains | 1.0 | 39.0
Securities available for sale debt securities, unrealized losses | (94.0) | (6.0)
Securities available for sale debt securities, fair value | 1,947.0 | 1,773.0
Held to maturity securities, amortized cost | 86.0 |
Held-to-maturity securities, unrealized losses | (1.0) |
Held-to-maturity securities, fair value | 85.0 |
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 | 1,396.0 | 3,423.0
Securities available for sale debt securities, unrealized gains |  | 31.0
Securities available for sale debt securities, unrealized losses | (46.0) | (18.0)
Securities available for sale debt securities, fair value | 1,350.0 | 3,436.0
Held to maturity securities, amortized cost | 1,842.0 |
Held-to-maturity securities, unrealized gains | 3.0 |
Held-to-maturity securities, unrealized losses | (20.0) |
Held-to-maturity securities, fair value | 1,825.0 |
Asset-backed |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 112.0 | 6,380.0
Securities available for sale debt securities, unrealized gains | 32.0 | 60.0
Securities available for sale debt securities, unrealized losses | (1.0) | (31.0)
Securities available for sale debt securities, fair value | 143.0 | 6,409.0
Held to maturity securities, amortized cost | 6,690.0 |
Held-to-maturity securities, unrealized gains | 3.0 |
Held-to-maturity securities, unrealized losses | (72.0) |
Held-to-maturity securities, fair value | 6,621.0 |
Other |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Securities available for sale debt securities, amortized cost | 3,548.0 | 4,792.0
Securities available for sale debt securities, unrealized gains | 48.0 | 186.0
Securities available for sale debt securities, unrealized losses | (199.0) | (14.0)
Securities available for sale debt securities, fair value | 3,397.0 | 4,964.0
Held to maturity securities, amortized cost | 2,380.0 | 612.0
Held-to-maturity securities, unrealized gains | 11.0 | 27.0
Held-to-maturity securities, unrealized losses | (26.0) | (7.0)
Held-to-maturity securities, fair value | $ 2,365.0 | $ 632.0

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