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			9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain					$ 69
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7	$ 5		$ 20	23
Interest cost	8	7		24	27
Expected return on plan assets	(23)	(19)		(49)	(52)
Amortization of prior service cost	(6)	(4)		(17)	(19)
Total pension (credit) cost	(14)	(11)		(22)	(90)
Curtailment gain			$ (69)		(69)
US
Defined Benefit Plan Disclosure [Line Items]
Service cost	10	10		33	41
Interest cost	32	36		95	111
Expected return on plan assets	(63)	(58)		(190)	(175)
Amortization of prior service cost		2			6
Amortization of net loss	11	9		33	31
Total pension (credit) cost	(10)	(1)		(29)	14
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	24	31		91	105
Interest cost	67	76		199	226
Expected return on plan assets	(159)	(148)		(478)	(443)
Amortization of net loss	58	39		169	119
Total pension (credit) cost	$ (10)	$ (2)		$ (19)	$ 7