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Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | $ 19,054 | $ 10,691
Investment securities available for sale, gross unrealized gains | 34 | 0
Investment securities available for sale, gross unrealized losses | 239 | 251
Investment securities available for sale, estimated fair value | 18,849 | 10,440
Total debt securities Amortized cost | 33,249 | 26,021
Total debt securities Gross unrealized gains | 43 | 13
Total debt securities Gross unrealized losses | 1,488 | 1,286
Total debt securities Estimated fair value | 31,804 | 24,748
Readily marketable securities Amortized cost | 235 | 266
Readily marketable securities Gross unrealized gains | 3 | 5
Readily marketable securities Gross unrealized losses | 3 | 3
Readily marketable securities Estimated fair value | 235 | 268
Other securities, Amortized cost | 772 | 859
Other securities, Estimated fair value | 772 | 859
Equity and other securities, Amortized Cost | 1,007 | 1,125
Equity securities, Gross Unrealized Gains | 3 | 5
Equity securities, Gross Unrealized Losses | 3 | 3
Equity and other securities, Estimated Fair Value | 1,007 | 1,127
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized cost for held to maturity | 14,195 | 15,330
Gross unrealized gains for held to maturity | 9 | 13
Gross unrealized losses for held to maturity | 1,249 | 1,035
Investment securities, held to maturity, fair value | 12,955 | 14,308
U.S. Treasury |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 7,945 | 7,818
Investment securities available for sale, gross unrealized gains | 13 | 0
Investment securities available for sale, gross unrealized losses | 27 | 113
Investment securities available for sale, estimated fair value | 7,931 | 7,705
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized cost for held to maturity | 1,015 | 1,005
Gross unrealized gains for held to maturity | 0 | 0
Gross unrealized losses for held to maturity | 14 | 31
Investment securities, held to maturity, fair value | 1,001 | 974
Commercial |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 3,739 | 425
Investment securities available for sale, gross unrealized gains | 8 | 0
Investment securities available for sale, gross unrealized losses | 45 | 9
Investment securities available for sale, estimated fair value | 3,702 | 416
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized cost for held to maturity | 2,034 | 2,033
Gross unrealized gains for held to maturity | 0 | 0
Gross unrealized losses for held to maturity | 157 | 130
Investment securities, held to maturity, fair value | 1,877 | 1,903
Residential |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 7,368 | 2,272
Investment securities available for sale, gross unrealized gains | 13 | 0
Investment securities available for sale, gross unrealized losses | 167 | 118
Investment securities available for sale, estimated fair value | 7,214 | 2,154
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized cost for held to maturity | 8,773 | 9,747
Gross unrealized gains for held to maturity | 0 | 4
Gross unrealized losses for held to maturity | 961 | 802
Investment securities, held to maturity, fair value | 7,812 | 8,949
Other |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 2 | 176
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 0 | 11
Investment securities available for sale, estimated fair value | 2 | 165
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized cost for held to maturity | 1 | 2
Gross unrealized gains for held to maturity | 0 | 0
Gross unrealized losses for held to maturity | 0 | 0
Investment securities, held to maturity, fair value | 1 | 2
State and political subdivisions |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized cost for held to maturity | 2,335 | 2,501
Gross unrealized gains for held to maturity | 0 | 0
Gross unrealized losses for held to maturity | 117 | 67
Investment securities, held to maturity, fair value | 2,218 | 2,434
Privately issued |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
Amortized cost for held to maturity | 37 | 42
Gross unrealized gains for held to maturity | 9 | 9
Gross unrealized losses for held to maturity | 0 | 5
Investment securities, held to maturity, fair value | $ 46 | $ 46

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