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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
The table below displays the allocated beginning goodwill balances by segment along with changes in the carrying amount of goodwill for 2017 and 2016:
(In millions)
U.S. E&P
 
Int'l E&P
 
Total
2016
 
 
 
 
 
Beginning balance, gross
$
—

 
$
115

 
$
115

Less: accumulated impairments
—

 
—

 
—

Beginning balance, net
—

 
115

 
115

  Dispositions
—

 
—

 
—

Impairment
—

 
—

 
—

Ending balance, net
$
—

 
$
115

 
$
115

2017
 
 
 
 
 
Beginning balance, gross
$
—

 
$
115

 
$
115

Less: accumulated impairments
—

 
—

 
—

Beginning balance, net
—

 
115

 
115

Dispositions
—

 
—

 
—

Impairment
—

 
—

 
—

Ending balance, net
$
—

 
$
115

 
$
115