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Impairments (Tables)
 12 Months Ended
Dec. 31, 2016
Impairment Of Long Lived Assets Abstract [Abstract]  
Impairment Charges
During 2016, 2015 and 2014, we recognized the following before-tax impairment charges:
 
 
Millions of Dollars
 
2016

 
2015

 
2014

 
 
 
 
 
 
Midstream
$
3

 
1

 
—

Refining
2

 
3

 
147

Marketing and Specialties
—

 
3

 
3

 
$
5

 
7

 
150