Earnings Per Share - Reconciliation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Schlumberger Net Income
Basic	$ 421	$ 525
Diluted	$ 421	$ 525
Average Shares Outstanding
Basic	1,385	1,385
Assumed exercise of stock options		1
Unvested restricted stock	12	8
Diluted	1,397	1,394
Earnings per Share
Basic	$ 0.30	$ 0.38
Diluted	$ 0.30	$ 0.38

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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