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Unsecured Borrowings - Schedule of Unsecured Borrowings (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt Disclosure [Abstract]    
Unsecured short-term borrowings $ 72,385 $ 69,709
Unsecured long-term borrowings 276,914 242,634
Total $ 349,299 $ 312,343