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Borrowings - Additional Information (Detail) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2024 USD ($)
Debt Instrument [Line Items] |  |
Credit facility drawn | $ 3,000 | $ 3,000
FHLBs Facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | 17,700 | 17,700
Federal Reserve Bank of New York |  |
Debt Instrument [Line Items] |  |
Available line of credit | 24,500 | 24,500
Junior Subordinated Debt |  |
Debt Instrument [Line Items] |  |
Repayment of subordinated debt | $ 130 |
Loss on extinguishment of debt |  | $ 20
Short-term Borrowings |  |
Debt Instrument [Line Items] |  |
Stated maturity |  | 1 year

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