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Performance B.4. People (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) employee | Dec. 31, 2017 USD ($) employee | Dec. 31, 2016 USD ($) employee
Number of permanent employees: |  |  |
Continuing operations | employee | 16,987 | 14,404 | 13,211
Joint ventures (Guatemala, Honduras and Ghana – for 2018 and 2017) | employee | 4,416 | 4,326 | 4,023
Discontinued operations | employee | 0 | 397 | 751
Total | employee | 21,403 | 19,127 | 17,985
Classes of employee benefits expense: |  |  |
Wages and salaries | $ (356) | $ (320) | $ (290)
Social security | (61) | (57) | (67)
Share based compensation | (21) | (22) | (14)
Pension and other long-term benefit costs | (7) | (8) | (6)
Other employee related costs | (70) | (45) | (74)
Total | $ (514) | $ (451) | $ (451)

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