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Capital structure and financing - C.1. Share capital and other equity reserves (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share Capital, Reserves And Other Equity Interest And Financial Instruments [Abstract]      
Number of shares authorised 133,333,200 133,333,200  
Number of shares issued and fully paid 101,739,217 101,739,217  
Par value per share (usd per share) $ 1.50 $ 1.50  
Share capital $ 153 $ 153  
Share premium 478 480  
Share capital and premium 630 633 [1]  
Disclosure of reserves within equity [line items]      
Other equity reserves [1] (544)    
Share based compensation [2] 24 30 $ 22
Issuance of shares 1 1 2
Remeasurements of post-employment benefit obligations (2) 0 0 [3]
Cash flow hedge reserve movement (1) (16) (1) [3]
Currency translation movement (19) (4) (81) [3]
Effect of restructuring in Tanzania [4]   0  
Other equity reserves (562) (544) [1]  
Legal reserve      
Disclosure of reserves within equity [line items]      
Other equity reserves 16 16 16
Other equity reserves 16 16 16
Equity settled transaction reserve      
Disclosure of reserves within equity [line items]      
Other equity reserves 52 47 46
Share based compensation 24 29 22
Issuance of shares (26) (25) (22)
Other equity reserves 50 52 47
Hedge reserve      
Disclosure of reserves within equity [line items]      
Other equity reserves (18) (1) 0
Cash flow hedge reserve movement (1) (16) (1)
Other equity reserves (19) (18) (1)
Currency translation reserve      
Disclosure of reserves within equity [line items]      
Other equity reserves (593) (599) (531)
Currency translation movement (12) (2) (68)
Effect of restructuring in Tanzania   9  
Other equity reserves (605) (593) (599)
Pension obligation reserve      
Disclosure of reserves within equity [line items]      
Other equity reserves (2) (3) (3)
Remeasurements of post-employment benefit obligations (2)   0
Other equity reserves (4) (2) (3)
Other reserves      
Disclosure of reserves within equity [line items]      
Other equity reserves (544) (538) (472)
Share based compensation [2],[5] 24 29 22
Issuance of shares [5] (26) (25) (22)
Remeasurements of post-employment benefit obligations (2)   1
Cash flow hedge reserve movement (1) (16) 0
Currency translation movement (12) (2) (67)
Effect of restructuring in Tanzania [4],[5]   9  
Other equity reserves $ (562) $ (544) $ (538)
[1] The consolidated statement of financial position at December 31, 2019 has been restated after finalization of the purchase accounting of our acquisitions in Nicaragua and Panama (note A.1.2.).
[2] Share-based compensation – see note C.1.
[3] 2018 was not restated for the application of IFRS 16, as the Group elected the modified retrospective approach.
[4] Effect of the restructuring in Tanzania A.1.2.
[5] Other reserves – see note C.1.