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Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following:
June 30,
2020
December 31,
2019
 (In millions)
Crude oil and natural gas liquids$204  $92  
Materials and supplies156  169  
Total Inventories$360  $261