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Financial risk management - D.2.1. Debt denominated in US Dollars and other currencies (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | $ 5,691 | $ 5,972
Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | $ 5,691 | 5,972
Reasonably possible change in risk variable, percent | 10.00% |
Reasonably possible increase (decrease) in risk variable, impact on profit before tax | $ 45 | 17
Debt denominated in US dollars | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 3,384 | 3,535
Total debt denominated in other currencies | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 2,307 | 2,437
Colombia | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 614 | 531
Tanzania | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 40 | 14
Bolivia | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 337 | 350
Paraguay | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 180 | 206
El Salvador | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 118 | 268
Panama | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 869 | 918
Luxembourg (COP denominated) | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 41 | 43
Costa Rica | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | $ 107 | $ 107

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