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Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents as presented in our Consolidated Condensed Balance Sheets $ 1,057 $ 1,041 $ 1,196 $ 1,085
Restricted cash included in prepaid and other current assets 47 46 48 45
Restricted cash included in other noncurrent assets 23 71 49 110
Cash, cash equivalents and restricted cash as presented in our Consolidated Condensed Statements of Cash Flows 1,127 1,158 $ 1,293 $ 1,240
Foreign currency translation adjustment $ 1 $ (3)