Pension and Other Benefit Plans - Net Pension Cost (Credit) for Schlumberger Pension Plans and US Postretirement Medical Plan (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	$ 29	$ 30	$ 42
Interest cost on projected benefit obligation	46	47	48
Expected return on plan assets	(60)	(57)	(52)
Amortization of prior service cost	(29)	(32)	(32)
Amortization of net loss			13
Total pension cost	(14)	(12)	19
US Plan Assets
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	57	62	86
Interest cost on projected benefit obligation	175	177	170
Expected return on plan assets	(242)	(235)	(229)
Amortization of prior service cost	12	12	12
Amortization of net loss	39	79	123
Total pension cost	41	95	162
International
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	95	110	167
Interest cost on projected benefit obligation	306	311	297
Expected return on plan assets	(541)	(517)	(498)
Amortization of prior service cost	97	122	121
Amortization of net loss	120	78	170
Total pension cost	$ 77	$ 104	$ 257