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Asset Impairments (Tables)
 12 Months Ended
Dec. 31, 2014
Asset Impairment Charges [Abstract]  
Asset Impairment Charges Pre Tax (non-cash)
Pre-tax (non-cash) asset impairment charges were as follows:
 
Year Ended December 31,
(millions)
2014
 
2013
 
2012
Onshore US
$
42

 
$
39

 
$
39

Deepwater Gulf of Mexico
350

 
—

 
34

Eastern Mediterranean
14

 
47

 
31

North Sea
94

 
—

 
—

Total
$
500

 
$
86

 
$
104