Revenue - Changes in the Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 698	$ 736	$ 658
Current-period provision for expected credit losses	747	775	758
Write-offs charged against the allowance, net of recoveries and other	(707)	(812)	(680)
Ending balance	$ 738	$ 698	$ 736