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Summary of Accounting Policies - Reconciliation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Income (Loss) Attributable to Schlumberger
Basic	$ 2,138	$ (1,505)	$ (1,687)
Diluted	$ 2,138	$ (1,505)	$ (1,687)
Average Shares Outstanding
Basic	1,385	1,388	1,357
Unvested restricted stock	8
Diluted	1,393	1,388	1,357
Earnings (Loss) per Share
Basic	$ 1.54	$ (1.08)	$ (1.24)
Diluted	$ 1.53	$ (1.08)	$ (1.24)

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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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