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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Supplemental disclosures:    
Cash paid for interest $ 2 $ 3
Non-cash investing activities:    
Capital expenditure additions included in accounts payable (6) (1)
Turnaround expenditures included in accounts payable $ (7) $ 0