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, 2020	Mar. 31, 2019
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9	$ 8
Interest cost	10	12
Expected return on plan assets	(17)	(16)
Amortization of prior service cost	(7)	(7)
Total pension cost (credit)	(5)	(3)
US
Defined Benefit Plan Disclosure [Line Items]
Service cost	15	14
Interest cost	37	45
Expected return on plan assets	(58)	(58)
Amortization of prior service cost	2	2
Amortization of net loss	11	8
Total pension cost (credit)	7	11
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	37	32
Interest cost	75	83
Expected return on plan assets	(147)	(150)
Amortization of prior service cost		2
Amortization of net loss	40	16
Total pension cost (credit)	$ 5	$ (17)