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Other Taxes (Tables)
12 Months Ended
Dec. 31, 2013
Table Text Block [Abstract]  
Other Taxes
Taxes incurred, other than income taxes, for the years ended December 31 were as follows: 
millions
2013
 
2012
 
2011
Production and severance
$
706

 
$
855

 
$
1,094

Ad valorem
277

 
238

 
265

Other
94

 
131

 
133

Total
$
1,077

 
$
1,224

 
$
1,492