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Charges (Tables)
 3 Months Ended
Jun. 30, 2011
Charges [Abstract]  
Summary of Charges
                             
    (Stated in millions)     Consolidated Statement
    Pretax     Tax     Net     of Income Classification
Merger-related integration costs
  $ 66     $ 14     $ 52     Merger & integration
Donation to the Schlumberger Foundation
    50       10       40     General & administrative
 
                     
 
  $ 116     $ 24     $ 92      
 
                     
                             
    (Stated in millions)     Consolidated Statement
    Pretax     Tax     Net     of Income Classification
Merger-related transaction costs
  $ 35     $ —     $ 35     Merger & integration
Impact of elimination of tax deduction related to Medicare Part D subsidy
    —       (40 )     40     Taxes on income
 
                     
 
  $ 35     $ (40 )   $ 75