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Investments of Insurance Subsidiaries - Schedule of Investments (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Amounts classified as current assets $ (94) $ (88)
Investment carrying value 573 569
Money market funds and other, Amortized Cost 339 296
Money market funds and other, Unrealized Gains 0 0
Money market funds and other, Unrealized Losses 0 0
Money market funds and other, Fair Value 339 296
Investment Owned, at Cost, Total 682 684
Investment Gains 1 0
Investment Losses (16) (27)
Investment Fiar Value 667 657
Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 343 388
Unrealized Amounts, Gains 1 0
Unrealized Amounts, Losses (16) (27)
Fair Value $ 328 $ 361