Other Financial Data - Schedule of Other Current Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Other Financial Data [Abstract]
Deferred revenue	$ 329		$ 311
Taxes payable	164		139
Other	479		420
Total	972	$ 883	870
Revenue recognized from deferred revenue	100
Current portion of transition tax	$ 42		$ 42