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Asset Impairments (Tables)
 12 Months Ended
Dec. 31, 2015
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)
2015
 
2014
 
2013
Onshore US
$
—

 
$
42

 
$
39

Deepwater Gulf of Mexico
158

 
350

 
—

Equatorial Guinea
339

 
—

 
—

Eastern Mediterranean
36

 
14

 
47

North Sea
—

 
94

 
—

Total
$
533

 
$
500

 
$
86