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The Millicom Group - A.2. Joint Ventures (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of joint ventures [line items] |  |  |  |
Statutory reserves unavailable for distribution | $ 345,000,000 | $ 324,000,000 | $ 345,000,000 | $ 321,000,000
Increase (Decrease) Joint Ventures [Roll Forward] |  |  |  |
Investments in joint ventures |  | 2,966,000,000 |  |
Results for the year |  | (68,000,000) | (6,000,000) | 0
Investments in joint ventures | 2,966,000,000 | 2,867,000,000 | 2,966,000,000 |
Joint ventures |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Assets (liabilities) | 3,457,000,000 | 3,405,000,000 | 3,457,000,000 |
Statutory reserves unavailable for distribution | 123,000,000 | 133,000,000 | 123,000,000 |
Dividends and advances paid to Millicom |  | $ 243,000,000 | 203,000,000 |
Guatemala joint ventures |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Proportion of ownership interest in joint venture |  | 55.00% |  |
Dividends and advances paid to Millicom |  | $ 211,000,000 | 162,000,000 | 77,000,000
Increase (Decrease) Joint Ventures [Roll Forward] |  |  |  |
Investments in joint ventures |  | 2,145,000,000 | 2,179,000,000 |
Adjustment on adoption of IFRS 15 and IFRS 9 (net of tax) |  | 18,000,000 |  |
Capital increase |  | 0 |  |
Change in scope |  |  | 0 |
Results for the year |  | 131,000,000 | 126,000,000 | 106,000,000
Dividends declared during the year |  | (177,000,000) | (168,000,000) |
Currency exchange differences |  | (14,000,000) | 7,000,000 |
Investments in joint ventures | 2,145,000,000 | $ 2,103,500,000 | $ 2,145,000,000 | 2,179,000,000
Comunicaciones Celulares S.A |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Proportion of ownership interest in joint venture |  | 55.00% | 55.00% |
Navega.com S.A. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Proportion of ownership interest in joint venture |  | 55.00% | 55.00% |
Honduras joint ventures |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Proportion of ownership interest in joint venture |  | 66.70% |  |
Dividends and advances paid to Millicom |  | $ 32,000,000 | $ 40,000,000 | 66,000,000
Increase (Decrease) Joint Ventures [Roll Forward] |  |  |  |
Investments in joint ventures |  | 726,000,000 | 766,000,000 |
Adjustment on adoption of IFRS 15 and IFRS 9 (net of tax) |  | 5,000,000 |  |
Capital increase |  | 3,000,000 |  |
Change in scope |  |  | 0 |
Results for the year |  | 23,000,000 | 15,000,000 | 9,000,000
Dividends declared during the year |  | 0 | (46,000,000) |
Currency exchange differences |  | (26,000,000) | (9,000,000) |
Investments in joint ventures | 726,000,000 | $ 730,100,000 | $ 726,000,000 | 766,000,000
Telefonica Celular S.A |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Proportion of ownership interest in joint venture |  | 66.70% | 66.70% |
Navega S.A. de CV |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Proportion of ownership interest in joint venture |  | 66.70% | 66.70% |
Ghana |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Proportion of ownership interest in joint venture |  | 50.00% | 50.00% |
Dividends and advances paid to Millicom | 0 | $ 0 |  |
Increase (Decrease) Joint Ventures [Roll Forward] |  |  |  |
Investments in joint ventures |  | 96,000,000 | $ 0 |
Adjustment on adoption of IFRS 15 and IFRS 9 (net of tax) |  | 0 |  |
Capital increase |  | 0 |  |
Change in scope |  |  | 102,000,000 |
Results for the year | (6,000,000) | (68,000,000) | (6,000,000) |
Dividends declared during the year |  | 0 | 0 |
Currency exchange differences |  | 3,000,000 | 0 |
Investments in joint ventures | $ 96,000,000 | $ 31,800,000 | $ 96,000,000 | $ 0

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