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Supplemental Cash Flow Information (Tables)
 3 Months Ended
Mar. 31, 2019
Supplemental Cash Flow Elements [Abstract]  
Schedule of cash flows related to income taxes, interest, and construction in process
Cash flows related to income taxes, interest and construction in process were as follows:
 
Three Months Ended March 31,
(in millions)
2019
 
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
)
 
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