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Remuneration (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Employees
Dec. 31, 2018
USD ($)
Employees
Dec. 31, 2017
USD ($)
Employees
Renumeration [abstract]      
Salaries $ 2,766 $ 2,863 $ 2,671
Pension costs 446 463 469
Payroll tax 413 409 387
Other compensations and social costs 330 318 290
Total payroll costs $ 3,955 $ 4,052 $ 3,818
Average number of employees | Employees 21,400 20,700 20,700
Part time employees as percentage of total employees 4.00% 3.00% 3.00%
Remuneration to members of the BoD and the CEC [abstract]      
Current employee benefits $ 10,958 $ 12,471 $ 11,067
Post-employment benefits 661 667 636
Other non-current benefits 18 21 25
Share-based payment benefits 147 197 175
Total compensation expense 11,782 13,356 11,902
Loans to the members of the BoD or the CEC 0 $ 0 $ 0
Compensation cost yet to be expensed 158    
2019 programme [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Estimated compensation expense 74    
2018 programme [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Estimated compensation expense 73    
2017 programme [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Estimated compensation expense 72    
2016 programme [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Estimated compensation expense $ 62