Pension and Other Benefit Plans - Net Pension Cost for Schlumberger Pension Plans and US Postretirement Medical Plan (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
US Plan Assets
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	$ 80	$ 68	$ 59
Interest cost on projected benefit obligation	150	152	150
Expected return on plan assets	(200)	(185)	(170)
Amortization of net loss	122	95	89
Amortization of prior service cost	12	12	12
Total pension cost	164	142	140
International
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	127	86	64
Interest cost on projected benefit obligation	253	241	226
Expected return on plan assets	(384)	(328)	(279)
Amortization of net loss	155	76	31
Amortization of prior service cost	117	120	120
Total pension cost	268	195	162
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	48	29	24
Interest cost on projected benefit obligation	56	58	57
Expected return on plan assets	(37)	(30)	(20)
Amortization of net loss	23	16	13
Amortization of prior service cost	(4)	(7)	(11)
Total pension cost	$ 86	$ 66	$ 63