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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, 2018
Dec. 31, 2017
Dec. 31, 2016
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 $ 1.5 $ 1.5  
Share capital $ 153 $ 153  
Share premium 482 484  
Share capital and premium 635 637 [1]  
Disclosure of reserves within equity [line items]      
Other equity reserves [1] (472)    
Share based compensation [2] 22 22 $ 14
Issuance of shares 2 1 4
Remeasurements of post-employment benefit obligations 0 (2) [3] (2) [3]
Cash flow hedge reserve movement (1) 4 [3] (3) [3]
Currency translation movement (81) 85 [3] (14) [3]
Other equity reserves (538) (472) [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 47 43 46
Share based compensation 22 22 14
Issuance of shares (22) (18) (17)
Other equity reserves 47 47 43
Hedge reserve      
Disclosure of reserves within equity [line items]      
Other equity reserves 0 (4) (1)
Cash flow hedge reserve movement   4 (3)
Other equity reserves 0 0 (4)
Currency translation reserve      
Disclosure of reserves within equity [line items]      
Other equity reserves (531) (616) (593)
Currency translation movement (68) 85 (23)
Other equity reserves (599) (531) (616)
Pension obligation reserve      
Disclosure of reserves within equity [line items]      
Other equity reserves (3) (1) 1
Remeasurements of post-employment benefit obligations   (2) (2)
Other equity reserves (3) (3) (1)
Other reserves      
Disclosure of reserves within equity [line items]      
Other equity reserves (472) (562) (531)
Share based compensation [2] 22 22 14
Issuance of shares (22) (18) (17)
Remeasurements of post-employment benefit obligations   (2) (2)
Cash flow hedge reserve movement   4 (3)
Currency translation movement (68) 85 (23)
Other equity reserves $ (538) $ (472) $ (562)
[1] Not restated for the application of IFRS 15 and 9, as the Group elected the modified retrospective approach for both standards.
[2] Share-based compensation – see note C.1.
[3] Re-presented for discontinued operations (shown in note A.4.).