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Inventories (Tables)
 3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
 
March 31,
 
December 31,
(In millions)
2019
 
2018
Crude oil and natural gas
$
12

 
$
11

Supplies and other items
71

 
85

Inventories
$
83

 
$
96