Other Financial Data - Schedule of Other Current Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Other Financial Data [Abstract]
Deferred revenue	$ 334		$ 334		$ 296
Taxes payable	42		42		80
Leases	217		217		234
Liabilities held for sale	38		38		0
Other	717		717		561
Total	1,348		1,348		$ 1,171
Revenue recognized from deferred revenue	$ 104	$ 69	$ 448	$ 357