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Other Noncurrent Liabilities (Tables)
 6 Months Ended
Jun. 30, 2020
Other Liabilities Disclosure [Abstract]  
Other Noncurrent Liabilities [Table Text Block]
 
June 30,
2020
 
December 31,
2019
 
(in millions)
Reserve for underground storage tank removal
$
69

 
$
67

Accrued environmental expense, long-term
18

 
23

Other
10

 
7

Total
$
97

 
$
97