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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
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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.).

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