Earnings Per Share - Reconciliation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Schlumberger Net Income
Basic	$ 492	$ 430	$ 913	$ 955
Diluted	$ 492	$ 430	$ 913	$ 955
Average Shares Outstanding
Basic	1,384	1,384	1,385	1,385
Assumed exercise of stock options		1		1
Unvested restricted stock	11	7	11	7
Diluted	1,395	1,392	1,396	1,393
Earnings per Share
Basic	$ 0.36	$ 0.31	$ 0.66	$ 0.69
Diluted	$ 0.35	$ 0.31	$ 0.65	$ 0.69

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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units 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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