Investments of Insurance Subsidiaries - Schedule of Investments (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amounts classified as current assets	$ (95)	$ (87)
Investment carrying value	553	477
Money market funds and other, Amortized Cost	270	188
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	270	188
Investment Owned, at Cost, Total	666	592
Investment Gains	2	1
Investment Losses	(20)	(29)
Investment Fiar Value	648	564
Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	396	404
Unrealized Amounts, Gains	2	1
Unrealized Amounts, Losses	(20)	(29)
Fair Value	$ 378	$ 376