Other Financial Data - Schedule of Other Non-Current Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Other Financial Data [Abstract]
Taxes payable	$ 529	$ 288
Leases	153	136
Compensation and benefits	67	56
Deferred revenue	49	49
Other	304	190
Total other non-current liabilities	1,102	$ 719
Transition tax for accumulated foreign earnings, noncurrent	$ 222