Business Developments and Risks and Uncertainties (Schedule of Results of Operations from Discontinued Operation) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues
Revenues	$ 29	$ 23	$ 92	$ 23
Cost of sales	15	11	46	11
Total revenues from discontinued operations	14	12	46	12
Expenses:
Operating	16	11	53	11
Interest	1	0	3	0
Increase (decrease) on loss on disposal group	(2)	0	(8)	0
Total expenses from discontinued operations	15	11	48	11
Income (loss) before income taxes from discontinued operations	(1)	1	(2)	1
Provision (benefit) for income taxes from discontinued operations	0	0	0	0
Income (loss) from discontinued operations, net of income taxes	$ (1)	$ 1	$ (2)	$ 1