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Indebtedness - Principal Payments Due on Long-Term Borrowings (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt Disclosure [Abstract]    
2025 (After September 30,) $ 0  
2026 0  
2027 587  
2028 500  
2029 400  
Thereafter 5,681  
Total principal payment $ 7,168 $ 7,694