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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

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