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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
US Plan Assets
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 13	$ 21	$ 31	$ 43
Interest cost	45	44	89	85
Expected return on plan assets	(58)	(59)	(118)	(115)
Amortization of prior service cost	3	1	6	6
Amortization of net loss	17	31	40	62
Total pension cost	20	38	48	81
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	19	50	56	99
Interest cost	77	75	157	149
Expected return on plan assets	(129)	(129)	(263)	(257)
Amortization of prior service cost	31	31	61	61
Amortization of net loss	17	36	39	74
Total pension cost	15	63	50	126
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	10	15	21
Interest cost	12	11	24	24
Expected return on plan assets	(15)	(13)	(29)	(26)
Amortization of prior service cost	(8)	(8)	(16)	(16)
Amortization of net loss		2		7
Total pension cost	$ (4)	$ 2	$ (6)	$ 10