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Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 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 $ 993 $ 1,032 $ 1,498 $ 1,196
Restricted cash included in prepaid and other current assets 6 45 40 48
Restricted cash included in other noncurrent assets 0 5 0 49
Cash, cash equivalents and restricted cash as presented in our Consolidated Condensed Statements of Cash Flows 999 1,082 $ 1,538 $ 1,293
Foreign currency translation adjustment $ 1 $ 3