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Long-term Debt (Tables)
3 Months Ended
Jun. 30, 2011
Long-term Debt [Abstract]  
Long-term Debt
                 
    (Stated in millions)  
    Jun. 30,     Dec. 31,  
    2011     2010  
 
               
4.50% Guaranteed Notes due 2014
  $   1,437     $   1,319  
2.75% Guaranteed Notes due 2015
    1,428       1,310  
4.200% Guaranteed Notes due 2021
    1,099        
5.25% Guaranteed Notes due 2013
    718       659  
2.65% Guaranteed Notes due 2016
    497        
3.00% Guaranteed Notes due 2013
    450       450  
9.75% Senior Notes due 2019
          776  
8.625% Senior Notes due 2014
          272  
6.00% Senior Notes due 2016
          218  
Commercial paper borrowings
          367  
Other variable rate debt
    103       133  
 
           
 
    5,732       5,504  
Fair value adjustment — hedging
    13       13  
 
           
 
  $   5,745     $   5,517