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Earnings Per Share - Reconciliation of Earnings Per Share from Continuing Operations (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Schlumberger amounts attributable to:        
Basic $ 1,949 $ 1,715 $ 5,341 $ 5,137
Assumed exercise of stock options 0 0 0 0
Unvested restricted stock 0 0 0 0
Diluted $ 1,949 $ 1,715 $ 5,341 $ 5,137
Average shares outstanding:        
Basic 1,294 1,322 1,300 1,326
Assumed exercise of stock options 12 7 11 6
Unvested restricted stock 4 4 4 4
Diluted 1,310 1,333 1,315 1,336
Earnings per Share from Continuing Operations        
Basic $ 1.51 $ 1.30 $ 4.11 $ 3.87
Diluted $ 1.49 $ 1.29 $ 4.07 $ 3.84