Summary of Accounting Policies - Reconciliation of Earnings Per Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Line Items]
Income from continuing operations	$ 6,801	$ 5,230	$ 4,516
Schlumberger Income from Continuing Operations, Diluted	$ 6,801	$ 5,230	$ 4,516
Basic	1,323	1,330	1,349
Weighted Average Shares Outstanding, Assumed exercise of stock options	6	5	10
Weighted Average Shares Outstanding, Unvested restricted stock	4	4	2
Weighted Average Shares Outstanding, Diluted	1,333	1,339	1,361
Income from continuing operations	$ 5.14	$ 3.93	$ 3.35
Income from continuing operations	$ 5.10	$ 3.91	$ 3.32