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Assets and Liabilities Measured at Fair Value - Summary of Investments of Insurance Subsidiaries Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Money market funds and other | $ 188 | $ 96
Investments of insurance subsidiaries | 564 | 473
Less amounts classified as current assets | (87) | (92)
Asset fair value | 477 | 381
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Money market funds and other | 188 | 96
Investments of insurance subsidiaries | 188 | 96
Less amounts classified as current assets | (87) | (92)
Asset fair value | 101 | 4
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 | 376 | 377
Asset fair value | 376 | 377
Debt Securities [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt securities | 376 | 377
Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt securities | $ 376 | $ 377

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