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Inventories
3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Inventories 2.  Inventories
Inventories consisted of the following:
March 31,
2022
December 31,
2021
 (In millions)
Crude oil and natural gas liquids$83 $52 
Materials and supplies160 171 
Total Inventories$243 $223