Pension and Other Benefit Plans - Net Pension Cost for Schlumberger Pension Plans and US Postretirement Medical Plan (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
US Plan Assets
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	$ 86	$ 72	$ 80
Interest cost on projected benefit obligation and on accumulated postretirement benefit obligation	170	164	150
Expected return on plan assets	(229)	(208)	(200)
Amortization of prior service cost	12	12	12
Amortization of net loss	123	82	122
Total pension cost	162	122	164
International
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	167	126	127
Interest cost on projected benefit obligation and on accumulated postretirement benefit obligation	297	288	253
Expected return on plan assets	(498)	(450)	(384)
Amortization of prior service cost	121	120	117
Amortization of net loss	170	94	155
Total pension cost	257	178	268
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	42	43	48
Interest cost on projected benefit obligation and on accumulated postretirement benefit obligation	48	60	56
Expected return on plan assets	(52)	(45)	(37)
Amortization of prior service cost	(32)	(4)	(4)
Amortization of net loss	13	1	23
Total pension cost	$ 19	$ 55	$ 86