Supplementary Information - Allowance for Credit Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Allowance for doubtful accounts
Balance at beginning of year	$ 400	$ 373
Provision	69	111
Write-offs	(34)	(23)
Prior year recoveries	(44)	(39)
Other	(50)	(22)
Balance at end of year	$ 341	$ 400