Investments of Insurance Subsidiaries - Schedule of Investments (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amounts classified as current assets	$ (103)	$ (92)
Investment carrying value	382	381
Money market funds and other, Amortized Cost	124	96
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	124	96
Investment Owned, at Cost, Total	528	511
Investment Gains	0	0
Investment Losses	(43)	(38)
Investment Fiar Value	485	473
Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	404	415
Unrealized Amounts, Gains	0	0
Unrealized Amounts, Losses	(43)	(38)
Fair Value	$ 361	$ 377