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Investments of Insurance Subsidiaries - Schedule of Investments (Detail) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amounts classified as current assets | $ (95) | $ (87)
Investment carrying value | 553 | 477
Money market funds and other, Amortized Cost | 270 | 188
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 | 270 | 188
Investment Owned, at Cost, Total | 666 | 592
Investment Gains | 2 | 1
Investment Losses | (20) | (29)
Investment Fiar Value | 648 | 564
Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 396 | 404
Unrealized Amounts, Gains | 2 | 1
Unrealized Amounts, Losses | (20) | (29)
Fair Value | $ 378 | $ 376

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