Earnings Per Share - Reconciliation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schlumberger Net Income (Loss)
Basic	$ 545	$ 176	$ 749	$ (1,482)
Diluted	$ 545	$ 176	$ 749	$ (1,482)
Average Shares Outstanding
Basic	1,385	1,392	1,388	1,345
Assumed exercise of stock options	1	4	2
Unvested restricted stock	6	5	5
Diluted	1,392	1,401	1,395	1,345
Earnings (Loss) per Share
Basic	$ 0.39	$ 0.13	$ 0.54	$ (1.10)
Diluted	$ 0.39	$ 0.13	$ 0.54	$ (1.10)