Pension and Other Postretirement Benefit Plans - Net Pension Cost (Credit) for Schlumberger Pension Plans and US Postretirement Medical Plan (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 8
Interest cost	12	11
Expected return on plan assets	(16)	(15)
Amortization of prior service cost	(7)	(7)
Total pension cost (credit)	(3)	(3)
US
Defined Benefit Plan Disclosure [Line Items]
Service cost	14	16
Interest cost	45	43
Expected return on plan assets	(58)	(62)
Amortization of prior service cost	2	3
Amortization of net loss	8	12
Total pension cost (credit)	11	12
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	32	32
Interest cost	83	77
Expected return on plan assets	(150)	(147)
Amortization of prior service cost	2	3
Amortization of net loss	16	44
Total pension cost (credit)	$ (17)	$ 9