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Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Sep. 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 $ 1,032 $ 1,087 $ 1,196 $ 1,085
Restricted cash included in prepaid and other current assets 45 47 48 45
Restricted cash included in other noncurrent assets 5 63 49 110
Cash, cash equivalents and restricted cash as presented in our Consolidated Condensed Statements of Cash Flows 1,082 1,197 $ 1,293 $ 1,240
Foreign currency translation adjustment $ 3 $ (5)