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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
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | $ 4,580 | $ 3,785
Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Reasonably possible change in risk variable, percent | 10.00% |
Debt | $ 4,580 | 3,785
Reasonably possible increase in risk variable, impact on profit before tax | 53 | 104
Reasonably possible decrease in risk variable, impact on profit before tax | (53) | (104)
US Dollar | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 3,132 | 1,983
Total debt denominated in other currencies | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 1,448 | 1,802
Colombia | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 718 | 834
Chad | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 62 | 61
Tanzania | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 112 | 121
Bolivia | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 306 | 337
Paraguay | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 207 | 191
Luxembourg (SEK denominated) | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 43 | 243
Other | Foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | $ 0 | $ 15

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