Schedule II - Valuation and Qualifying Accounts and Reserves (Detail) - Allowance for Credit Losses - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 2	$ 4	$ 7
Charged to Income		9	9	5
Other Charges		(1)	(1)	0
Payments & Deductions	[1]	9	10	8
Balance at End of Period		$ 1	$ 2	$ 4

[1] Write-off of individual bad debt accounts