Investments of Insurance Subsidiaries - Schedule of Investments (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amounts classified as current assets	$ (104)	$ (87)
Investment carrying value	483	477
Money market funds and other, Amortized Cost	221	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	221	188
Investment Owned, at Cost, Total	618	592
Investment Gains	0	1
Investment Losses	(31)	(29)
Investment Fiar Value	587	564
Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	397	404
Unrealized Amounts, Gains	0	1
Unrealized Amounts, Losses	(31)	(29)
Fair Value	$ 366	$ 376