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Capital structure and financing - C.2. Dividend distributions (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Share Capital, Reserves And Other Equity Interest And Financial Instruments [Abstract] |  |  |
Statutory reserves unavailable for distribution | $ 472 | $ 486 | $ 310

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- Definition Share Capital, Reserves And Other Equity Interest And Financial Instruments [Abstract] + References No definition available. + Details
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Namespace Prefix: | tigo_
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- Definition Statutory Reserves Unavailable For Distribution + References No definition available. + Details
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Namespace Prefix: | tigo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant