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Asset Impairments (Tables)
 12 Months Ended
Dec. 31, 2017
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)
2017
 
2016
 
2015
Gulf of Mexico
$
63

 
$
—

 
$
158

Israel
—

 
88

 
36

Equatorial Guinea
—

 
—

 
339

Other International
7

 
4

 
—

Total
$
70

 
$
92

 
$
533