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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Supplemental disclosures:    
Cash paid for income taxes, net of refunds $ 31 $ 15
Cash paid for interest 103 106
Non-cash investing and financing activities:    
Construction in progress additions included in accounts payable 17 8
Turnaround additions included in accounts payable 1 3
Change in accounts payable related to construction in progress additions 9 (5)
Change in accounts payable related to turnaround additions (2) 3
Landlord incentives for leasehold improvements $ 0 $ 1