Business Developments and Risks and Uncertainties (Schedule of Results of Operations from Discontinued Operation) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues
Revenues	$ 31		$ 63
Cost of sales	14		31
Total revenues from discontinued operations	17		32
Expenses:
Operating	16		36
Interest	1		2
Increase (decrease) on loss on disposal group	(3)		(6)
Total expenses from discontinued operations	14		32
Income (loss) before income taxes from discontinued operations	3		0
Provision (benefit) for income taxes from discontinued operations	0		0
Income (loss) from discontinued operations, net of income taxes	$ 3	$ 0	$ 0	$ 0