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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Postretirement medical plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the period $ 32 $ 29 $ 30
Interest cost on projected benefit obligation 43 46 47
Expected return on plan assets (63) (60) (57)
Amortization of prior service cost (28) (29) (32)
Total pension cost (16) (14) (12)
US      
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the period 59 57 62
Interest cost on projected benefit obligation 167 175 177
Expected return on plan assets (248) (242) (235)
Amortization of prior service cost 13 12 12
Amortization of net loss 47 39 79
Total pension cost 38 41 95
International      
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the period 138 95 110
Interest cost on projected benefit obligation 304 306 311
Expected return on plan assets (584) (541) (517)
Amortization of prior service cost 10 97 122
Amortization of net loss 140 120 78
Total pension cost $ 8 $ 77 $ 104