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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2014
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 2014 and 2013:
(In millions)
N.A. E&P
 
Int'l E&P
 
OSM
 
Total
2013
 
 
 
 
 
 
 
Beginning balance, gross
$
343

 
$
182

 
$
1,412

 
$
1,937

Less: accumulated impairments
—

 
—

 
(1,412
)
 
(1,412
)
Beginning balance, net
343

 
182

 
—

 
525

Dispositions
4

(a) 
(30
)
 
—

 
(26
)
Ending balance, net
$
347

 
$
152

 
$
—

 
$
499

2014
 
 
 
 
 
 
 
Beginning balance, gross
$
347

 
$
152

 
$
1,412

 
$
1,911

Less: accumulated impairments
—

 
—

 
(1,412
)
 
(1,412
)
Beginning balance, net
347

 
152

 
—

 
499

Dispositions
(3
)
 
(37
)
 
—

 
(40
)
Ending balance, net
$
344

 
$
115

 
$
—

 
$
459