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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
US Plan Assets
Defined Benefit Plan Disclosure [Line Items]
Service cost — benefits earned during period	$ 16	$ 21	$ 35	$ 41
Interest cost on projected benefit obligation	35	38	76	75
Expected return on plan assets	(44)	(51)	(96)	(103)
Amortization of prior service cost	3	3	6	6
Amortization of net loss	24	31	44	63
Total pension cost	34	42	65	82
International
Defined Benefit Plan Disclosure [Line Items]
Service cost — benefits earned during period	29	34	60	67
Interest cost on projected benefit obligation	56	63	128	124
Expected return on plan assets	(88)	(100)	(200)	(200)
Amortization of prior service cost	22	29	52	59
Amortization of net loss	32	37	52	74
Total pension cost	51	63	92	124
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost — benefits earned during period	11	12	22	24
Interest cost on projected benefit obligation	15	15	30	30
Expected return on plan assets	(10)	(9)	(21)	(18)
Amortization of prior service cost	(1)	(1)	(2)	(2)
Amortization of net loss	3	8	4	15
Total pension cost	$ 18	$ 25	$ 33	$ 49