Other Financial Data - Schedule of Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Provision	$ 3	$ 4	$ 30	$ 19
Accounts written off, net of recoveries	(8)	0	(31)	(11)
Foreign currency translation and other	1	1	1	4
Balance at end of period	98	89	98	89
Cumulative Effect, Period Of Adoption, Adjusted Balance
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 102	$ 84	$ 98	$ 77