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Inventories
6 Months Ended
Jun. 30, 2024
Inventory Disclosure [Abstract]  
Inventories 2.  Inventories
Inventories consisted of the following:
June 30,
2024
December 31,
2023
 (In millions)
Crude oil and natural gas liquids$94 $72 
Materials and supplies288 232 
Total Inventories$382 $304