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Asset Impairments (Tables)
 12 Months Ended
Dec. 31, 2013
Impairments [Abstract]  
Asset Impairment Charges Pre Tax (non-cash)
Pre-tax (non-cash) asset impairment charges were as follows:
 
Year Ended December 31,
(millions)
2013
 
2012
 
2011
Piceance (Onshore US)
$
—

 
$
39

 
$
487

South Raton (Deepwater Gulf of Mexico)
—

 
34

 
—

Mari-B (Offshore Israel)
47

 
31

 
—

Other Onshore US Properties
39

 
—

 
270

Total
$
86

 
$
104

 
$
757