Business Developments and Risks and Uncertainties (Schedule of Results of Operations from Discontinued Operation) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues
Revenues	$ 116	$ 58
Cost of sales	58	29
Total revenues from discontinued operations	58	29
Expenses:
Operating	67	28
Interest	4	1
Increase (decrease) on loss on disposal group	(10)	54
Total expenses from discontinued operations	61	83
Income (loss) before income taxes from discontinued operations	(3)	(54)
Provision (benefit) for income taxes from discontinued operations	0	0
Income (loss) from discontinued operations, net of income taxes	$ (3)	$ (54)	$ 0