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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