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Pension and Other Postretirement Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2018
Compensation And Retirement Disclosure [Abstract] |
Net Pension Cost (Credit) for Schlumberger Pension Plans and US Postretirement Medical Plan | Net pension cost (credit) for the Schlumberger pension plans included the following components:
(Stated in millions) |  |
| Second Quarter |  |  | Six Months |  |
| 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |  |
| US |  |  | Int'l |  |  | US |  |  | Int'l |  |  | US |  |  | Int'l |  |  | US |  |  | Int'l |  |
Service cost | $ | 14 |  |  | $ | 38 |  |  | $ | 14 |  |  | $ | 19 |  |  | $ | 30 |  |  | $ | 70 |  |  | $ | 29 |  |  | $ | 48 |  |
Interest cost |  | 41 |  |  |  | 76 |  |  |  | 44 |  |  |  | 75 |  |  |  | 84 |  |  |  | 152 |  |  |  | 88 |  |  |  | 153 |  |
Expected return on plan assets |  | (63 | ) |  |  | (149 | ) |  |  | (62 | ) |  |  | (134 | ) |  |  | (125 | ) |  |  | (293 | ) |  |  | (122 | ) |  |  | (270 | ) |
Amortization of prior service cost |  | 3 |  |  |  | 3 |  |  |  | 3 |  |  |  | 24 |  |  |  | 6 |  |  |  | 5 |  |  |  | 6 |  |  |  | 48 |  |
Amortization of net loss |  | 12 |  |  |  | 27 |  |  |  | 9 |  |  |  | 27 |  |  |  | 24 |  |  |  | 70 |  |  |  | 19 |  |  |  | 60 |  |
| $ | 7 |  |  | $ | (5 | ) |  | $ | 8 |  |  | $ | 11 |  |  | $ | 19 |  |  | $ | 4 |  |  | $ | 20 |  |  | $ | 39 |  |
The net periodic benefit credit for the Schlumberger US postretirement medical plan included the following components:
(Stated in millions) |
| Second Quarter |  |  | Six Months |
| 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Service cost | $ | 8 |  |  | $ | 7 |  |  | $ | 16 |  |  | $ | 15 |
Interest cost |  | 10 |  |  |  | 12 |  |  |  | 22 |  |  |  | 23 |
Expected return on plan assets |  | (16 | ) |  |  | (16 | ) |  |  | (32 | ) |  |  | (31 | )
Amortization of prior service credit |  | (7 | ) |  |  | (7 | ) |  |  | (14 | ) |  |  | (14 | )
| $ | (5 | ) |  | $ | (4 | ) |  | $ | (8 | ) |  | $ | (7 | )

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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