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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 8	$ 23	$ 24
Interest cost	12	11	36	33
Expected return on plan assets	(16)	(15)	(49)	(47)
Amortization of prior service cost	(7)	(7)	(21)	(21)
Total pension cost (credit)	(3)	(3)	(11)	(11)
US
Defined Benefit Plan Disclosure [Line Items]
Service cost	14	14	41	44
Interest cost	45	41	136	125
Expected return on plan assets	(58)	(61)	(173)	(186)
Amortization of prior service cost	3	3	7	9
Amortization of net loss	7	12	23	36
Total pension cost (credit)	11	9	34	28
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	32	35	96	105
Interest cost	82	77	248	229
Expected return on plan assets	(148)	(149)	(446)	(442)
Amortization of prior service cost	2	3	6	8
Amortization of net loss	16	35	47	105
Total pension cost (credit)	$ (16)	$ 1	$ (49)	$ 5