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The Millicom Group - A.1.2. Acquisition of subsidiaries and changes in non-controlling interests in subsidiaries Narrative (Details) - USD ($) $ in Millions |  | 2 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 29, 2022 | Dec. 31, 2021 | Nov. 12, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Put option liability |  |  | $ 290 | [1] |  | $ 0 |  | $ 290 | [1] |
Effect of the buy-out of non-controlling interest in Panama | [2] |  |  |  |  | 0 |  |  |  |
Total |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Effect of the buy-out of non-controlling interest in Panama |  | $ 78 |  |  |  | $ 78 | [2] |  |  |
Guatemala joint ventures |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  | 55.00% | 100.00% |  | 55.00% |  | 55.00%
Telecomunicaciones Digitales, S.A. |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Percentage of controlling interest acquired |  | 20.00% |  |  |  |  |  |  |  |
Acquisition price |  | $ 290 |  |  |  |  |  |  |  |
Put option liability |  | $ 290 |  |  |  |  |  |  |  |
Guatemala joint ventures |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Percentage of controlling interest acquired |  |  |  |  | 45.00% |  |  |  |  |
Acquisition price |  |  | 2,195 |  | $ 2,195 |  |  | $ 2,195 |  |
Acquisition-date fair value |  |  |  |  | $ 2,683 |  |  |  |  |
Revenue of acquiree since acquisition date |  |  | 223 |  |  |  |  |  |  |
Net profit (loss) of acquiree since acquisition date |  |  | $ 43 |  |  |  |  |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  |  |  |  |  |  | 1,380 |  |
Profit (loss) of combined entity as if combination occurred at beginning of period |  |  |  |  |  |  |  | $ 147 |  |
[1] | Restated after the finalization of the Guatemala purchase accounting. See note A.1.2. for further details.
[2] | Resulting from the exercise of the put option in Panama, see note A.1.2.

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