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Inventories (Tables)
 6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
 
June 30,
 
December 31,
(In millions)
2018
 
2017
Crude oil and natural gas
$
11

 
$
9

Supplies and other items
106

 
117

Inventories
$
117

 
$
126