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Payroll, staff and employee benefits obligations - Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Employee benefits obligations      
Restructuring reserves (early retirement plans) $ 106 $ 108 $ 149
TOTAL 3,917 3,501 3,363
Net liabilities related to assets held for sale 1    
Pension benefits      
Employee benefits obligations      
Pension benefits and other benefits liabilities 3,111 2,651 2,545
Net liabilities related to assets held for sale 1    
Other benefits      
Employee benefits obligations      
Pension benefits and other benefits liabilities $ 700 $ 742 $ 669