Pension and Other Postretirement Benefit Plans - Net Pension Cost for Schlumberger Pension Plans and US Postretirement Medical Plan (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7	$ 8	$ 22	$ 23
Interest cost	11	11	35	35
Expected return on plan assets	(15)	(14)	(46)	(43)
Amortization of prior service cost	(7)	(8)	(22)	(24)
Total pension cost	(4)	(3)	(11)	(9)
US Plan Assets
Defined Benefit Plan Disclosure [Line Items]
Service cost	14	16	44	47
Interest cost	44	44	131	133
Expected return on plan assets	(60)	(60)	(181)	(178)
Amortization of prior service cost	3	3	9	9
Amortization of net loss	10	20	29	60
Total pension cost	11	23	32	71
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	24	27	71	83
Interest cost	76	78	230	235
Expected return on plan assets	(135)	(128)	(406)	(391)
Amortization of prior service cost	24	30	73	91
Amortization of net loss	30	20	90	59
Total pension cost	$ 19	$ 27	$ 58	$ 77