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Other Taxes
 12 Months Ended
Dec. 31, 2012
Disclosure Text Block [Abstract]  
Other Taxes

18.  Other Taxes

 

       Taxes incurred, other than income taxes, were as follows:

         
 Years Ended December 31,
millions2012 2011 2010
Production and severance$855 $1,094 $770
Ad valorem 238  265  219
Other 131  133  79
Total$1,224 $1,492 $1,068