Supplementary Information - Change in Allowance for Doubtful Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting [Abstract]
Balance at beginning of year	$ 337	$ 340	$ 319
Additions	6	18	54
Amounts written off	(18)	(21)	(33)
Balance at end of year	$ 325	$ 337	$ 340