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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.

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