Other Income, Net (Components of Other Income, Net) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Other income		$ 2	$ 2	$ 5	$ 5
Other expense		(4)	(1)	(11)
Gains on sales of assets	[1]		20	32	37
Allowance for equity funds used during construction			1		4
Other income, net		$ (2)	$ 22	$ 26	$ 46

[1] Includes amounts recognized in connection with the transfer of property to satisfy litigation. See Note 10 for additional information.