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Lease liability and Right-of-use assets (Details 3) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Movements of the right-of-use assets [roll forward]    
Right-of-use assets at beginning of period $ 1,677  
Impact of business combinations 32  
Additions to right-of-use assets 346 $ 537
Depreciation charge (330) (305)
Lease contract terminations, right-of-use assets (63) (98)
Impact of divestments (32) (17)
Increase decrease through net exchange differences, right-of-use assets 46 6
Right-of-use assets at end of period 1,676 1,677
Impairment loss recognised in profit or loss, right of use assets $ 0 0
Discontinued operations    
Movements of the right-of-use assets [roll forward]    
Additions to right-of-use assets   $ 3