Other Financial Data - Schedule of Other Non-Current Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Other Financial Data [Abstract]
Taxes payable	$ 585		$ 529
Leases	169		153
Compensation and benefits	56		67
Deferred revenue	65		49
Other	222		304
Total other non-current liabilities	1,097	$ 1,099	1,102
Transition tax for accumulated foreign earnings, noncurrent	$ 240		$ 222