Other Income, Net (Components of Other Income, Net) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Other income		$ 1	$ 1	$ 3	$ 3
Other expense		(5)		(7)	1
Gains on sales of assets	[1]	22	17	32	17
Allowance for equity funds used during construction			2		3
Other income, net		$ 18	$ 20	$ 28	$ 24

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