Other Financial Data - Schedule of Other Current Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Other Financial Data [Abstract]
Deferred revenue	$ 337		$ 337		$ 251
Leases	223		223
Taxes payable	133		133		83
Other	504		504		602
Total	1,197		1,197		$ 936
Revenue recognized from deferred revenue	$ 95	$ 115	$ 241	$ 215