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Deposits - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Deposit Liability [Line Items]
Deposits at fair value	$ 83,146	$ 44,855
U.S.
Deposit Liability [Line Items]
Time deposits, at or above FDIC insurance limit	24,440
Non-U.S.
Deposit Liability [Line Items]
Time deposits, at or above FDIC insurance limit	$ 49,650

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Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit.

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