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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7	$ 8	$ 15	$ 16
Interest cost	12	10	24	22
Expected return on plan assets	(17)	(16)	(33)	(32)
Amortization of prior service cost	(7)	(7)	(14)	(14)
Total pension cost (credit)	(5)	(5)	(8)	(8)
US
Defined Benefit Plan Disclosure [Line Items]
Service cost	13	14	27	30
Interest cost	46	41	91	84
Expected return on plan assets	(57)	(61)	(115)	(125)
Amortization of prior service cost	2	3	4	6
Amortization of net loss	8	10	16	24
Total pension cost (credit)	12	7	23	19
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	32	38	64	70
Interest cost	83	76	166	152
Expected return on plan assets	(148)	(149)	(298)	(293)
Amortization of prior service cost	2	3	4	5
Amortization of net loss	15	27	31	70
Total pension cost (credit)	$ (16)	$ (5)	$ (33)	$ 4