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Long-term Debt (Tables)
9 Months Ended
Sep. 30, 2011
Long-term Debt [Abstract] 
Long-term Debt
                 
    (Stated in millions)  
    Sept. 30,     Dec. 31,  
    2011     2010  
3.30% Senior Notes due 2021
  $ 1,595     $ —  
4.50% Guaranteed Notes due 2014
    1,364       1,319  
2.75% Guaranteed Notes due 2015
    1,357       1,310  
1.95% Senior Notes due 2016
    1,099       —  
4.20% Guaranteed Notes due 2021
    1,099       —  
5.25% Guaranteed Notes due 2013
    682       659  
2.65% Guaranteed Notes due 2016
    498       —  
3.00% Guaranteed Notes due 2013
    450       450  
Floating Rate Senior Notes due 2014
    299       —  
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
    287       133  
 
           
 
    8,730       5,504  
Fair value adjustment — hedging
    10       13  
 
           
 
  $ 8,740     $ 5,517