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Other Noncurrent Liabilities (Tables)
 9 Months Ended
Sep. 30, 2020
Other Liabilities Disclosure [Abstract]  
Other Noncurrent Liabilities [Table Text Block]
September 30,
2020		December 31,
2019
 (in millions)
Reserve for underground storage tank removal$74 $67 
Accrued environmental expense, long-term15 23 
Other16 7 
Total$105 $97