Income (loss) Per Share - Reconciliation of Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Schlumberger Net Income (Loss)
Basic	$ 431	$ (3,434)	$ 730	$ (10,810)
Diluted	$ 431	$ (3,434)	$ 730	$ (10,810)
Average Shares Outstanding
Basic	1,398	1,388	1,398	1,388
Unvested restricted stock	23		22
Diluted	1,421	1,388	1,420	1,388
Earnings Income (loss) per Share
Basic	$ 0.31	$ (2.47)	$ 0.52	$ (7.79)
Diluted	$ 0.30	$ (2.47)	$ 0.51	$ (7.79)