Other Financial Data - Schedule of Other Current Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Other Financial Data [Abstract]
Deferred revenue	$ 296	$ 270
Taxes payable	80	93
Leases	234	210
Other	561	513
Total	1,171	1,086
Deferred revenue recognized	$ 454	$ 532