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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Postretirement medical plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the period $ 29 $ 32 $ 29
Interest cost on projected benefit obligation 45 43 46
Expected return on plan assets (64) (63) (60)
Amortization of prior service cost (28) (28) (29)
Total pension cost (18) (16) (14)
US      
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the period 49 59 57
Interest cost on projected benefit obligation 180 167 175
Expected return on plan assets (232) (248) (242)
Amortization of prior service cost 10 13 12
Amortization of net loss 29 47 39
Settlement charge 37    
Total pension cost 73 38 41
International      
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the period 112 138 95
Interest cost on projected benefit obligation 333 304 306
Expected return on plan assets (592) (584) (541)
Amortization of prior service cost 7 10 97
Amortization of net loss 70 140 120
Total pension cost $ (70) $ 8 $ 77