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Revenue - Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2016
Revenue from Contract with Customer [Abstract]    
Contract assets included in prepaid and other current assets $ 28 $ 26
Contract liabilities included in accrued liabilities (1) (1)
Contract liabilities included in other non-current liabilities (7) (7)
Net contract asset $ 20 $ 18