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, 2024	Dec. 31, 2023
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Money market funds and other	$ 296	$ 188
Investments of insurance subsidiaries	657	564
Less amounts classified as current assets	(88)	(87)
Asset fair value	569	477
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	296	188
Investments of insurance subsidiaries	296	188
Less amounts classified as current assets	(88)	(87)
Asset fair value	208	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	361	376
Asset fair value	361	376
Debt Securities [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities	361	376
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	$ 361	$ 376