Earnings Per Share - Reconciliation of Earnings Per Share from Continuing Operations (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schlumberger amounts attributable to:
Basic	$ 1,800	$ 2,219	$ 3,392	$ 3,423
Diluted	$ 1,800	$ 2,219	$ 3,392	$ 3,423
Average shares outstanding:
Basic	1,300	1,327	1,303	1,329
Assumed exercise of stock options	11	5	9	6
Unvested restricted stock	4	4	4	4
Diluted	1,315	1,336	1,316	1,339
Earnings per Share from Continuing Operations
Basic	$ 1.38	$ 1.67	$ 2.60	$ 2.58
Diluted	$ 1.37	$ 1.66	$ 2.58	$ 2.56