Segments, Geographical Area and Major Customer Information - Reconciliation of Segment Net Assets to Consolidated Total Assets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting [Abstract]
Segment net assets	$ 3,009	$ 2,969	$ 2,365
Accounts payable and other current liabilities	1,672	1,604
Other current and long-term assets	1,237	1,071
Total assets	$ 5,918	$ 5,644