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Investment Securities - Schedule of Investment Securities Maturity Information (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Investment securities available for sale |  |
Non-amortizing securities maturing in one year or less, cost | $ 5,674 | $ 37
Non-amortizing securities maturing in after one through five years, cost | 4,996 | 2,068
Non-amortizing securities maturing in after five through 10 years, cost | 408 | 483
Non-amortizing securities maturing in after 10 years, cost | 17 | 17
Amortized Cost | 20,688 | 9,967
Non-amortizing securities maturing in one year or less, fair value | 5,658 | 37
Non-amortizing securities maturing in after one through five years, fair value | 4,959 | 1,928
Non-amortizing securities maturing in after five through 10 years, fair value | 369 | 455
Non-amortizing securities maturing in after 10 years, fair value | 16 | 14
Investment securities available for sale, fair value | 19,936 | 8,995
Investment securities held to maturity |  |
Non-amortizing securities maturing in one year or less, cost | 27 | 51
Non-amortizing securities maturing in after one through five years, cost | 1,636 | 1,479
Non-amortizing securities maturing in after five through 10 years, cost | 622 | 789
Amortized Cost | 9,979 | 10,279
Non-amortizing securities maturing in one year or less, fair value | 26 | 51
Non-amortizing securities maturing in after one through five years, fair value | 1,508 | 1,328
Non-amortizing securities maturing in after five through 10 years, fair value | 533 | 663
Investment securities held to maturity, cost, fair value | 8,503 | 8,795
Government agency |  |
Investment securities available for sale |  |
Without single maturity date, cost | 120 | 164
Without single maturity date, fair value | 117 | 162
Residential mortgage-backed securities |  |
Investment securities available for sale |  |
Without single maturity date, cost | 7,154 | 5,424
Without single maturity date, fair value | 6,686 | 4,795
Investment securities held to maturity |  |
Without single maturity date, cost | 4,205 | 4,605
Without single maturity date, fair value | 3,561 | 3,882
Commercial mortgage-backed securities |  |
Investment securities available for sale |  |
Without single maturity date, cost | 2,319 | 1,774
Without single maturity date, fair value | 2,131 | 1,604
Investment securities held to maturity |  |
Without single maturity date, cost | 3,489 | 3,355
Without single maturity date, fair value | $ 2,875 | $ 2,871

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