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Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
 
September 30,
 
December 31,
(In millions)
2017
 
2016
Crude oil and natural gas
$
9

 
$
6

Supplies and other items
123

 
130

Inventories
$
132

 
$
136