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Assets and Liabilities Measured at Fair Value - Schedule of Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Money market funds and other | $ 270 | $ 188
Investments of insurance subsidiaries | 648 | 564
Less amounts classified as current assets | (95) | (87)
Asset fair value | 553 | 477
Debt Securities [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt securities | 378 | 376
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Money market funds and other | 270 | 188
Investments of insurance subsidiaries | 270 | 188
Less amounts classified as current assets | (95) | (87)
Asset fair value | 175 | 101
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments of insurance subsidiaries | 378 | 376
Asset fair value | 378 | 376
Significant Other Observable Inputs (Level 2) [Member] | Debt Securities [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt securities | $ 378 | $ 376

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