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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
 
December 31,
(In millions)
2019
 
2018
Crude oil and natural gas
$
10

 
$
11

Supplies and other items
62

 
85

Inventories
$
72

 
$
96