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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 | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Money market funds and other | $ 301 | $ 296
Investments of insurance subsidiaries | 632 | 657
Less amounts classified as current assets | (101) | (88)
Asset fair value | 531 | 569
Debt Securities [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt securities | 331 | 361
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 | 301 | 296
Investments of insurance subsidiaries | 302 | 296
Less amounts classified as current assets | (101) | (88)
Asset fair value | 201 | 208
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Debt Securities [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt securities | 1 |
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 | 330 | 361
Asset fair value | 330 | 361
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 | $ 330 | $ 361

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