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The Millicom Group - A.3.2. Acquisitions and disposals of interests in associates (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 19, 2017 | Dec. 18, 2017 | Apr. 30, 2017 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Africa Internet Holding GmbH (AIH) |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |
Gain (loss) on dilution in investment by associate |  |  |  |  |  |  | $ 43 |
Dilution in investment in associate percent |  |  |  |  |  |  | 10.00% |
Proportion of ownership interest in associate |  |  |  |  | 10.15% | 10.15% |  |
Africa Internet Holding GmbH (AIH) | Dilution of interest in associate |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |
Gain (loss) on dilution in investment by associate |  |  |  | $ 7 |  |  |  |
Helios Towers Africa Ltd (HTA) |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |
Gain (loss) on dilution in investment by associate |  |  |  |  |  |  | $ 16 |
Proportion of ownership interest in associate |  |  |  |  | 22.83% | 22.83% | 22.80% | 28.20%
MKC Brilliant Holding GmbH (LIH) |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  |  |  | 35.00% | 35.00% | 35.00% |
Impairment loss |  |  |  |  |  | $ 48 | $ 40 |
Gains (losses) on disposal |  |  | $ (11) |  |  |  |  |
Milvik AB |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |
Gain (loss) on dilution in investment by associate | $ 11 |  |  |  |  |  |  |
Proportion of ownership interest in associate | 12.00% | 20.40% |  |  | 12.30% | 12.30% |  |
Contributions to associate by other investors | $ 97 |  |  |  |  |  |  |
Proceeds from sales of interests in associates | 24 |  |  |  |  |  |  |
Gains (losses) on disposal | $ 21 |  |  |  |  |  |  |

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