Income (loss) Per Share - Reconciliation of Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schlumberger Net Income (Loss)
Basic	$ 550	$ (82)	$ 1,280	$ (10,892)
Diluted	$ 550	$ (82)	$ 1,280	$ (10,892)
Average Shares Outstanding
Basic	1,402	1,391	1,399	1,389
Unvested restricted stock	22		23
Diluted	1,424	1,391	1,422	1,389
Earnings Income (loss) per Share
Basic	$ 0.39	$ (0.06)	$ 0.92	$ (7.84)
Diluted	$ 0.39	$ (0.06)	$ 0.90	$ (7.84)