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Other Taxes (Tables)
 12 Months Ended
Dec. 31, 2012
Table Text Block [Abstract]  
Other Taxes [Table Text Block]
         
 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