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Fair Value Measurements - Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Detail) - Recurring - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Fair Value Measurements |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading account | $ 101 | $ 106
Investment securities available for sale: | 18,849 | 10,440
Equity securities | 235 | 268
Real estate loans held for sale | 521 | 379
Other assets | 255 | 324
Total assets | 19,961 | 11,517
Other liabilities | 822 | 943
Total liabilities | 822 | 943
Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading account | 101 | 101
Investment securities available for sale: | 0 | 0
Equity securities | 235 | 258
Real estate loans held for sale | 0 | 0
Other assets | 0 | 0
Total assets | 336 | 359
Other liabilities | 0 | 0
Total liabilities | 0 | 0
Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading account | 0 | 5
Investment securities available for sale: | 18,849 | 10,440
Equity securities | 0 | 10
Real estate loans held for sale | 521 | 379
Other assets | 251 | 309
Total assets | 19,621 | 11,143
Other liabilities | 790 | 911
Total liabilities | 790 | 911
Level 3 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading account | 0 | 0
Investment securities available for sale: | 0 | 0
Equity securities | 0 | 0
Real estate loans held for sale | 0 | 0
Other assets | 4 | 15
Total assets | 4 | 15
Other liabilities | 32 | 32
Total liabilities | 32 | 32
U.S. Treasury | Fair Value Measurements |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 7,931 | 7,705
U.S. Treasury | Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 0 | 0
U.S. Treasury | Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 7,931 | 7,705
U.S. Treasury | Level 3 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 0 | 0
Commercial | Fair Value Measurements |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 3,702 | 416
Commercial | Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 0 | 0
Commercial | Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 3,702 | 416
Commercial | Level 3 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 0 | 0
Residential | Fair Value Measurements |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 7,214 | 2,154
Residential | Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 0 | 0
Residential | Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 7,214 | 2,154
Residential | Level 3 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 0 | 0
Other | Fair Value Measurements |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 2 | 165
Other | Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 0 | 0
Other | Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 2 | 165
Other | Level 3 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | $ 0 | $ 0

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