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Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
(In millions)
September 30, 2019
 
December 31, 2018
Crude oil and natural gas
$
9

 
$
11

Supplies and other items
62

 
85

Inventories
$
71

 
$
96