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, 2018	Mar. 31, 2017
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 8
Interest cost	11	11
Expected return on plan assets	(15)	(15)
Amortization of prior service cost	(7)	(7)
Total pension cost	(3)	(3)
US Plan Assets
Defined Benefit Plan Disclosure [Line Items]
Service cost	16	15
Interest cost	43	44
Expected return on plan assets	(62)	(60)
Amortization of prior service cost	3	3
Amortization of net loss	12	10
Total pension cost	12	12
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	32	29
Interest cost	77	78
Expected return on plan assets	(147)	(136)
Amortization of prior service cost	3	24
Amortization of net loss	44	33
Total pension cost	$ 9	$ 28