Summary of Accounting Policies - Reconciliation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schlumberger Income from Continuing Operations
Basic	$ 2,072	$ 5,643	$ 6,801
Diluted	$ 2,072	$ 5,643	$ 6,801
Average shares outstanding:
Basic	1,267	1,295	1,323
Assumed exercise of stock options	4	9	6
Unvested restricted stock	4	4	4
Diluted	1,275	1,308	1,333
Earnings per Share from Continuing Operations
Basic	$ 1.63	$ 4.36	$ 5.14
Diluted	$ 1.63	$ 4.31	$ 5.10