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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Curtailment gain |  |  | $ 69 |
Postretirement medical plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 5 | $ 8 | 23 | $ 23
Interest cost | 7 | 12 | 27 | 36
Expected return on plan assets | (19) | (16) | (52) | (49)
Amortization of prior service cost | (4) | (7) | (19) | (21)
Total pension cost (credit) | (11) | (3) | (90) | (11)
Curtailment gain |  |  | (69) |
US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 10 | 14 | 41 | 41
Interest cost | 36 | 45 | 111 | 136
Expected return on plan assets | (58) | (58) | (175) | (173)
Amortization of prior service cost | 2 | 3 | 6 | 7
Amortization of net loss | 9 | 7 | 31 | 23
Total pension cost (credit) | (1) | 11 | 14 | 34
International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 31 | 32 | 105 | 96
Interest cost | 76 | 82 | 226 | 248
Expected return on plan assets | (148) | (148) | (443) | (446)
Amortization of prior service cost |  | 2 |  | 6
Amortization of net loss | 39 | 16 | 119 | 47
Total pension cost (credit) | $ (2) | $ (16) | $ 7 | $ (49)

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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