Earnings (Loss) Per Share - Reconciliation of Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schlumberger Net Income (Loss)
Basic	$ (3,434)	$ 492	$ (10,810)	$ 913
Diluted	$ (3,434)	$ 492	$ (10,810)	$ 913
Average Shares Outstanding
Basic	1,388	1,384	1,388	1,385
Unvested restricted stock		11		11
Diluted	1,388	1,395	1,388	1,396
Earnings (loss) per Share
Basic	$ (2.47)	$ 0.36	$ (7.79)	$ 0.66
Diluted	$ (2.47)	$ 0.35	$ (7.79)	$ 0.65