Earnings (Loss) Per Share - Reconciliation of Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schlumberger Net Income
Basic	$ (11,383)	$ 644	$ (10,470)	$ 1,599
Diluted	$ (11,383)	$ 644	$ (10,470)	$ 1,599
Average Shares Outstanding
Basic	1,385	1,385	1,385	1,385
Assumed exercise of stock options				1
Unvested restricted stock		7		7
Diluted	1,385	1,392	1,385	1,393
Earnings (loss) per Share
Basic	$ (8.22)	$ 0.46	$ (7.56)	$ 1.15
Diluted	$ (8.22)	$ 0.46	$ (7.56)	$ 1.15

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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