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Unsecured Borrowings - Unsecured Short-Term Borrowings (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt Disclosure [Abstract]    
Current portion of unsecured long-term borrowings $ 32,606 $ 38,521
Hybrid financial instruments 37,221 29,130
Other unsecured short-term borrowings 2,558 2,058
Total unsecured short-term borrowings $ 72,385 $ 69,709
Weighted average interest rate 5.28% 5.87%