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Fair Value Measurements - Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-Sale | $ 12,134 | $ 10,440
U.S. Treasury and Federal Agencies [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-Sale | 7,719 | 7,705
Commercial Mortgage-Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-Sale | 1,343 | 416
Residential Mortgage-Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-Sale | 2,910 | 2,154
Other Debt Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-Sale | 162 | 165
Fair Value Measurements, Recurring [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading account | 99 | 106
Debt Securities, Available-for-Sale | 12,134 | 10,440
Equity Securities, FV-NI, Current | 356 | 268
Real estate loans held for sale | 728 | 379
Other assets | 318 | 324
Total assets | 13,635 | 11,517
Other liabilities | 1,072 | 943
Total liabilities | 1,072 | 943
Fair Value Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading account | 99 | 101
Equity Securities, FV-NI, Current | 343 | 258
Total assets | 442 | 359
Fair Value Measurements, Recurring [Member] | Significant Observable Inputs (Level 2) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading account |  | 5
Debt Securities, Available-for-Sale | 12,134 | 10,440
Equity Securities, FV-NI, Current | 13 | 10
Real estate loans held for sale | 728 | 379
Other assets | 312 | 309
Total assets | 13,187 | 11,143
Other liabilities | 1,036 | 911
Total liabilities | 1,036 | 911
Fair Value Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other assets | 6 | 15
Total assets | 6 | 15
Other liabilities | 36 | 32
Total liabilities | 36 | 32
Fair Value Measurements, Recurring [Member] | U.S. Treasury and Federal Agencies [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-Sale | 7,719 | 7,705
Fair Value Measurements, Recurring [Member] | U.S. Treasury and Federal Agencies [Member] | Significant Observable Inputs (Level 2) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-Sale | 7,719 | 7,705
Fair Value Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-Sale | 1,343 | 416
Fair Value Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member] | Significant Observable Inputs (Level 2) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-Sale | 1,343 | 416
Fair Value Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-Sale | 2,910 | 2,154
Fair Value Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Significant Observable Inputs (Level 2) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-Sale | 2,910 | 2,154
Fair Value Measurements, Recurring [Member] | Other Debt Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-Sale | 162 | 165
Fair Value Measurements, Recurring [Member] | Other Debt Securities [Member] | Significant Observable Inputs (Level 2) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-Sale | $ 162 | $ 165

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