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Performance B.4. People (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
employee
Dec. 31, 2019
USD ($)
employee
Dec. 31, 2018
USD ($)
employee
Number of permanent employees:      
Continuing operations (employees) | employee 16,955,000 17,687,000 16,725,000
Joint ventures (Guatemala, Honduras and Ghana) (employees) | employee 4,464,000 4,688,000 4,416,000
Discontinued operations (employees) | employee 0 0 262,000
Total (employees) | employee 21,419,000 22,375,000 21,403,000
Classes of employee benefits expense:      
Wages and salaries $ (356) $ (358) $ (346)
Social security (66) (68) (60)
Share based compensation (24) (27) (21)
Pension and other long-term benefit costs (4) (4) (7)
Other employees related costs (27) (39) (67)
Total $ (477) $ (496) $ (500)