Investments of Insurance Subsidiaries - Schedule of Investments (Detail) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amounts classified as current assets	$ (101)	$ (88)
Investment carrying value	531	569
Money market funds and other, Amortized Cost	301	296
Money market funds and other, Unrealized Gains	0	0
Money market funds and other, Unrealized Losses	0	0
Money market funds and other, Fair Value	301	296
Investment Owned, at Cost, Total	650	684
Investment Gains	1	0
Investment Losses	(19)	(27)
Investment Fiar Value	632	657
Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	349	388
Unrealized Amounts, Gains	1	0
Unrealized Amounts, Losses	(19)	(27)
Fair Value	$ 331	$ 361