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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Curtailment gain | $ 69 |  | $ 69 |
Postretirement medical plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 9 | $ 7 | 18 | $ 15
Interest cost | 10 | 12 | 20 | 24
Expected return on plan assets | (17) | (17) | (34) | (33)
Amortization of prior service cost | (7) | (7) | (14) | (14)
Total pension cost (credit) | (74) | (5) | (79) | (8)
Curtailment gain | (69) |  | (69) |
US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 16 | 13 | 31 | 27
Interest cost | 38 | 46 | 75 | 91
Expected return on plan assets | (59) | (57) | (117) | (115)
Amortization of prior service cost | 2 | 2 | 4 | 4
Amortization of net loss | 11 | 8 | 22 | 16
Total pension cost (credit) | 8 | 12 | 15 | 23
International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 37 | 32 | 74 | 64
Interest cost | 75 | 83 | 150 | 166
Expected return on plan assets | (147) | (148) | (294) | (298)
Amortization of prior service cost |  | 2 |  | 4
Amortization of net loss | 39 | 15 | 79 | 31
Total pension cost (credit) | $ 4 | $ (16) | $ 9 | $ (33)

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