Pension and Other Postretirement Benefit Plans - Net Pension (Credit) Cost for Schlumberger Pension Plans and US Postretirement Medical Plan (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7	$ 9
Interest cost	8	10
Expected return on plan assets	(14)	(17)
Amortization of prior service cost	(5)	(7)
Total pension (credit) cost	(4)	(5)
US
Defined Benefit Plan Disclosure [Line Items]
Service cost	11	15
Interest cost	32	37
Expected return on plan assets	(63)	(58)
Amortization of prior service cost		2
Amortization of net loss	11	11
Total pension (credit) cost	(9)	7
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	33	37
Interest cost	69	75
Expected return on plan assets	(158)	(147)
Amortization of net loss	52	40
Total pension (credit) cost	$ (4)	$ 5