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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	$ 69		$ 69
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	9	$ 7	18	$ 15
Interest cost	10	12	20	24
Expected return on plan assets	(17)	(17)	(34)	(33)
Amortization of prior service cost	(7)	(7)	(14)	(14)
Total pension cost (credit)	(74)	(5)	(79)	(8)
Curtailment gain	(69)		(69)
US
Defined Benefit Plan Disclosure [Line Items]
Service cost	16	13	31	27
Interest cost	38	46	75	91
Expected return on plan assets	(59)	(57)	(117)	(115)
Amortization of prior service cost	2	2	4	4
Amortization of net loss	11	8	22	16
Total pension cost (credit)	8	12	15	23
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	37	32	74	64
Interest cost	75	83	150	166
Expected return on plan assets	(147)	(148)	(294)	(298)
Amortization of prior service cost		2		4
Amortization of net loss	39	15	79	31
Total pension cost (credit)	$ 4	$ (16)	$ 9	$ (33)