Pension and Other Postretirement Benefit Plans - Net Pension Cost for Schlumberger Pension Plans and US Postretirement Medical Plan (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
US Plan Assets
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 18	$ 22
Interest cost	44	41
Expected return on plan assets	(61)	(56)
Amortization of prior service cost	3	5
Amortization of net loss (gain)	23	31
Total pension cost	27	43
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	37	49
Interest cost	80	74
Expected return on plan assets	(134)	(128)
Amortization of prior service cost	30	30
Amortization of net loss (gain)	22	38
Total pension cost	35	63
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	11
Interest cost	12	13
Expected return on plan assets	(14)	(13)
Amortization of prior service cost	(8)	(8)
Amortization of net loss (gain)		5
Total pension cost	$ (2)	$ 8