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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 7	$ 16	$ 15
Interest cost	10	12	22	23
Expected return on plan assets	(16)	(16)	(32)	(31)
Amortization of prior service cost	(7)	(7)	(14)	(14)
Total pension cost	(5)	(4)	(8)	(7)
US
Defined Benefit Plan Disclosure [Line Items]
Service cost	14	14	30	29
Interest cost	41	44	84	88
Expected return on plan assets	(63)	(62)	(125)	(122)
Amortization of prior service cost	3	3	6	6
Amortization of net loss	12	9	24	19
Total pension cost	7	8	19	20
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	38	19	70	48
Interest cost	76	75	152	153
Expected return on plan assets	(149)	(134)	(293)	(270)
Amortization of prior service cost	3	24	5	48
Amortization of net loss	27	27	70	60
Total pension cost	$ (5)	$ 11	$ 4	$ 39