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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2012
Supplemental Cash Flow Information  
Supplemental Cash Flow Information
          
(Millions) 2012 2011 2010
Cash income tax payments, net of refunds $ 1,717 $ 1,542 $ 1,509
Cash interest payments   166   219   178
Capitalized interest   23   19   17