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, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	$ 69
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	31	$ 29	$ 32
Interest cost on projected benefit obligation	36	45	43
Expected return on plan assets	(70)	(64)	(63)
Amortization of prior service cost	(25)	(28)	(28)
Total pension cost	(97)	(18)	(16)
Curtailment gain	(69)
US
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	55	49	59
Interest cost on projected benefit obligation	148	180	167
Expected return on plan assets	(233)	(232)	(248)
Amortization of prior service cost	8	10	13
Amortization of net loss	41	29	47
Settlement charge		37
Total pension cost	19	73	38
International
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	140	112	138
Interest cost on projected benefit obligation	301	333	304
Expected return on plan assets	(591)	(592)	(584)
Amortization of prior service cost		7	10
Amortization of net loss	159	70	140
Total pension cost	$ 9	$ (70)	$ 8