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Loss Per Share - Reconciliation of Loss Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Schlumberger Net Income (Loss)        
Basic $ (82) $ (11,383) $ (10,892) $ (10,470)
Diluted $ (82) $ (11,383) $ (10,892) $ (10,470)
Average Shares Outstanding        
Basic 1,391 1,385 1,389 1,385
Diluted 1,391 1,385 1,389 1,385
Earnings (loss) per Share        
Basic $ (0.06) $ (8.22) $ (7.84) $ (7.56)
Diluted $ (0.06) $ (8.22) $ (7.84) $ (7.56)