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Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents as presented in our Consolidated Condensed Balance Sheets $ 1,178 $ 1,057 $ 1,498 $ 1,196
Restricted cash included in prepaid and other current assets 25 47 40 48
Restricted cash included in other noncurrent assets 0 23 0 49
Cash included in assets held for sale 6 0    
Cash, cash equivalents and restricted cash as presented in our Consolidated Condensed Statements of Cash Flows 1,209 1,127 $ 1,538 $ 1,293
Foreign currency translation adjustment $ (1) $ 1