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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Loss Contingencies [Line Items] |  |
Fair value | $ 9,060,000,000 | $ 5,780,000,000
Loans pledged to FHLB, collateral for wholesale borrowings | 44,500,000,000 | 33,900,000,000
Commitments | 22,368,000,000 |
Commitments to purchase securities | 0 |
Asset pledged as collateral |  |
Loss Contingencies [Line Items] |  |
Fair value | 4,000,000 | 464,000,000
Mortgage-Related Securities |  |
Loss Contingencies [Line Items] |  |
Securities held to maturity, mortgaged related securities, pledged | 430,000,000 | 704,000,000
Total loan commitments |  |
Loss Contingencies [Line Items] |  |
Commitments | 21,827,000,000 | 2,800,000,000
Commercial, performance stand-by, and financial stand-by letters of credit |  |
Loss Contingencies [Line Items] |  |
Commitments | $ 541,000,000 | $ 291,000,000

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