Earnings 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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schlumberger Net Income (Loss)
Basic	$ 430	$ (74)	$ 955	$ 205
Diluted	$ 430	$ (74)	$ 955	$ 205
Average Shares Outstanding
Basic	1,384	1,387	1,385	1,390
Assumed exercise of stock options	1		1	2
Unvested restricted stock	7		7	5
Diluted	1,392	1,387	1,393	1,397
Earnings (loss) per Share
Basic	$ 0.31	$ (0.05)	$ 0.69	$ 0.15
Diluted	$ 0.31	$ (0.05)	$ 0.69	$ 0.15

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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