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Remuneration (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Employees
Dec. 31, 2019
USD ($)
Employees
Dec. 31, 2018
USD ($)
Employees
Renumeration [abstract]      
Salaries $ 2,625 $ 2,766 $ 2,863
Pension costs 432 446 462
Payroll tax 368 413 409
Other compensations and social costs 283 330 318
Total payroll costs $ 3,707 $ 3,955 $ 4,052
Average number of employees | Employees 21,700 21,400 20,700
Part time employees as percentage of total employees 2.00% 4.00% 3.00%
Remuneration to members of the BoD and the CEC [abstract]      
Current employee benefits $ 8,986 $ 10,958 $ 12,471
Post-employment benefits 589 661 667
Other non-current benefits 14 18 21
Share-based payment benefits 119 147 197
Total compensation expense 9,708 11,782 13,356
Loans to the members of the BoD or the CEC 0 $ 0 $ 0
Compensation cost yet to be expensed 164    
2021 programme [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Estimated compensation expense 79    
2020 programme [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Estimated compensation expense 74    
2019 programme [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Estimated compensation expense 73    
2018 programme [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Estimated compensation expense $ 72