Summary of Accounting Policies - Reconciliation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Income (Loss) Attributable to Schlumberger
Basic	$ (1,505)	$ (1,687)	$ 2,072
Diluted	$ (1,505)	$ (1,687)	$ 2,072
Average Shares Outstanding
Basic	1,388	1,357	1,267
Assumed exercise of stock options			4
Unvested restricted stock			4
Diluted	1,388	1,357	1,275
Earnings (Loss) per Share
Basic	$ (1.08)	$ (1.24)	$ 1.63
Diluted	$ (1.08)	$ (1.24)	$ 1.63