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Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents as presented in our Consolidated Condensed Balance Sheets $ 1,163 $ 1,041 $ 1,498 $ 1,196
Restricted cash included in prepaid and other current assets 32 49 40 48
Restricted cash included in other noncurrent assets 0 34 0 49
Cash, cash equivalents and restricted cash as presented in our Consolidated Condensed Statements of Cash Flows 1,195 1,124 $ 1,538 $ 1,293
Foreign currency translation adjustment $ 2 $ 3