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Indebtedness - Fair Value and Carrying Value of Long-Term Debt (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Carrying Value $ 6,983 $ 7,428
Level 2    
Debt Instrument [Line Items]    
Estimated Fair Value $ 6,283 $ 6,601