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Asset Impairments (Tables)
 6 Months Ended
Jun. 30, 2014
Asset Impairments [Abstract]  
Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]
Pre-tax (non-cash) asset impairment charges were as follows:
 
Three Months Ended
June 30,
 
Six Months Ended June 30,
(millions)
2014
 
2013
 
2014
 
2013
US Properties, Primarily Shelf and Deepwater Gulf of Mexico
$
18

 
$
—

 
$
23

 
$
—

Mari-B (Offshore Israel)
14

 
—

 
14

 
—

McCulloch and Other North Sea Properties
2

 
—

 
94

 
—

Total
$
34

 
$
—

 
$
131

 
$
—