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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following:
September 30,
2020
December 31,
2019
 (In millions)
Crude oil and natural gas liquids$241 $92 
Materials and supplies181 169 
Total Inventories$422 $261