Pension and Other Postretirement Benefits - Net Pension Cost for Schlumberger Pension Plans and US Postretirement Medical Plan (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
US Plan Assets
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during period	$ 19	$ 21
Interest cost on projected benefit obligation	41	37
Expected return on plan assets	(52)	(51)
Amortization of prior service cost	3	3
Amortization of net loss	20	30
Total pension cost	31	40
International
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during period	31	34
Interest cost on projected benefit obligation	72	64
Expected return on plan assets	(113)	(100)
Amortization of prior service cost	30	29
Amortization of net loss	20	37
Total pension cost	40	64
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during period	11	12
Interest cost on projected benefit obligation	15	15
Expected return on plan assets	(11)	(9)
Amortization of prior service cost	(1)	(1)
Amortization of net loss	1	7
Total pension cost	$ 15	$ 24