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Accounts Payable and Accrued Liabilities (Tables)
 12 Months Ended
Dec. 31, 2010
Accounts Payable and Accrued Liabilities (Tables) [Abstract]  
Accrued Liabilities
                 
    December 31,  
    2010     2009  
    (Millions)  
Income taxes
  $ 275     $ 112  
Interest on debt
    162       199  
Employee costs
    146       158  
Taxes other than income taxes
    110       176  
Other, including other loss contingencies
    309       303  
 
           
 
  $ 1,002     $ 948