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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain		$ 69		$ 69
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6	9	$ 13	18
Interest cost	8	10	16	20
Expected return on plan assets	(12)	(17)	(26)	(34)
Amortization of prior service cost	(6)	(7)	(11)	(14)
Total pension (credit) cost	(4)	(74)	(8)	(79)
Curtailment gain		(69)		(69)
US
Defined Benefit Plan Disclosure [Line Items]
Service cost	12	16	23	31
Interest cost	31	38	63	75
Expected return on plan assets	(64)	(59)	(127)	(117)
Amortization of prior service cost		2		4
Amortization of net loss	11	11	22	22
Total pension (credit) cost	(10)	8	(19)	15
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	34	37	67	74
Interest cost	63	75	132	150
Expected return on plan assets	(161)	(147)	(319)	(294)
Amortization of net loss	59	39	111	79
Total pension (credit) cost	$ (5)	$ 4	$ (9)	$ 9