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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following:
September 30,
2021
December 31,
2020
 (In millions)
Crude oil and natural gas liquids$76 $226 
Materials and supplies186 152 
Total Inventories$262 $378