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Investment Securities - Schedule of Investment Securities Maturity Information (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Investment securities available for sale |  |
Non-amortizing securities maturing in one year or less, cost | $ 0 | $ 0
Non-amortizing securities maturing in after one through five years, cost | 2,054 | 2,049
Non-amortizing securities maturing in after five through 10 years, cost | 515 | 523
Non-amortizing securities maturing in after 10 years, cost | 17 | 17
Investment securities available for sale, cost | 9,857 | 9,215
Non-amortizing securities maturing in one year or less, fair value | 0 | 0
Non-amortizing securities maturing in after one through five years, fair value | 1,951 | 2,048
Non-amortizing securities maturing in after five through 10 years, fair value | 506 | 548
Non-amortizing securities maturing in after 10 years, fair value | 16 | 17
Investment securities available for sale, fair value | 9,210 | 9,203
Investment securities held to maturity |  |
Non-amortizing securities maturing in one year or less, cost | 53 | 2
Non-amortizing securities maturing in after one through five years, cost | 920 | 0
Non-amortizing securities maturing in after five through 10 years, cost | 1,340 | 0
Investment securities held to maturity, cost | 9,832 | 3,809
Non-amortizing securities maturing in one year or less, fair value | 52 | 2
Non-amortizing securities maturing in after one through five years, fair value | 863 | 0
Non-amortizing securities maturing in after five through 10 years, fair value | 1,215 | 0
Investment securities held to maturity, cost, fair value | 8,812 | 3,759
Government agency |  |
Investment securities available for sale |  |
Without single maturity date, cost | 191 | 221
Investment securities available for sale, cost | 191 | 221
Without single maturity date, fair value | 190 | 221
Investment securities available for sale, fair value | 190 | 221
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 1,544 |
Investment securities held to maturity, cost, fair value | 1,424 |
Residential mortgage-backed securities |  |
Investment securities available for sale |  |
Without single maturity date, cost | 5,448 | 4,757
Investment securities available for sale, cost | 5,448 | 4,757
Without single maturity date, fair value | 5,020 | 4,729
Investment securities available for sale, fair value | 5,020 | 4,729
Investment securities held to maturity |  |
Without single maturity date, cost | 4,633 | 2,322
Investment securities held to maturity, cost | 4,633 | 2,322
Without single maturity date, fair value | 4,119 | 2,306
Investment securities held to maturity, cost, fair value | 4,119 | 2,306
Commercial mortgage-backed securities |  |
Investment securities available for sale |  |
Without single maturity date, cost | 1,632 | 1,648
Investment securities available for sale, cost | 1,632 | 1,648
Without single maturity date, fair value | 1,527 | 1,640
Investment securities available for sale, fair value | 1,527 | 1,640
Investment securities held to maturity |  |
Without single maturity date, cost | 2,886 | 1,485
Investment securities held to maturity, cost | 2,886 | 1,485
Without single maturity date, fair value | 2,563 | 1,451
Investment securities held to maturity, cost, fair value | $ 2,563 | $ 1,451

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