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Pension and Other Postretirement Benefit Plans - Net Pension (Credit) Cost for Schlumberger Pension Plans and US Postretirement Medical Plan (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Postretirement medical plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | $ 7 | $ 9
Interest cost | 8 | 10
Expected return on plan assets | (14) | (17)
Amortization of prior service cost | (5) | (7)
Total pension (credit) cost | (4) | (5)
US |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 11 | 15
Interest cost | 32 | 37
Expected return on plan assets | (63) | (58)
Amortization of prior service cost |  | 2
Amortization of net loss | 11 | 11
Total pension (credit) cost | (9) | 7
International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 33 | 37
Interest cost | 69 | 75
Expected return on plan assets | (158) | (147)
Amortization of net loss | 52 | 40
Total pension (credit) cost | $ (4) | $ 5

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