Charges and Credits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended					3 Months Ended	12 Months Ended		3 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2013 Venezuela Bolivar Official Currency Exchange Rate To Dollar	Dec. 31, 2012 Venezuela Bolivar Official Currency Exchange Rate To Dollar	Mar. 31, 2013 Other Restructuring	Dec. 31, 2012 Merger-related integration costs	Dec. 31, 2011 Merger-related integration costs	Dec. 31, 2012 Severance and other	Dec. 31, 2011 Write-off of Assets in Libya	Jun. 30, 2011 Grant made by Schlumberger to Schlumberger Foundation	Jun. 30, 2013 Drilling Related Technology	Jun. 30, 2013 Contract Drilling
Restructuring Cost And Reserve [Line Items]
Pre tax and after tax gain from deconsolidation of business		$ 1,028
Impairment charge, Pretax									128	113	33	60	50	222	142
Impairment charge, Net									112	95	27	60	40	203	142
Exchange rate						0.063	0.043
Currency loss before tax								92
Currency loss after tax								92
Pretax provision relating to accounts receivable	152		(420)	161	223
After tax provision relating to accounts receivable	$ 122		$ (469)	$ 139	$ 195