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