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Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
(In millions)
March 31, 2020
 
December 31, 2019
Crude oil and natural gas
$
12

 
$
10

Supplies and other items
66

 
62

Inventories
$
78

 
$
72