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The Millicom Group - A.3. Investments in associates (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of associates [line items] |  |  |  |
Investments in associates | $ 24 | $ 25 | [1] |
West Indian Ocean Cable Company Limited (WIOCC) |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate | 9.10% | 9.10% |  |
Investments in associates | $ 14 | $ 14 |  |
MKC Brilliant Holding GmbH (LIH) |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate | 35.00% | 35.00% |  | 35.00%
Milvik AB(i) |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate | 9.70% | 11.40% |  |
Investments in associates | $ 10 | $ 11 |  |
[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.).

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