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The Millicom Group - A.1. Subsidiaries (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Telemovil El Salvador S.A. de C.V.
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100.00%	100.00%	100.00%
Navega.com SA, Sucursal El Salvador
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100.00%	100.00%	100.00%
Cable Costa Rica S.A.
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100.00%	100.00%	100.00%
Telefonica Celular de Bolivia S.A.
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100.00%	100.00%	100.00%
Telefonica Celular del Paraguay S.A.
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100.00%	100.00%	100.00%
Cable Onda S.A
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	80.00%
Millicom Ghana Company Limited
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	0.00%	0.00%	100.00%
Sentel GSM S.A.
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	0.00%	100.00%	100.00%
MIC Tanzania Public Limited Company
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100.00%	100.00%	100.00%
Millicom Tchad S.A.
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100.00%	100.00%	100.00%
Millicom Rwanda Limited
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	0.00%	100.00%	100.00%
Zanzibar Telecom Limited
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	85.00%	85.00%	85.00%
Millicom International Operations S.A.
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100.00%	100.00%	100.00%
Millicom International Operations B.V.
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100.00%	100.00%	100.00%
Millicom LIH S.A.
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100.00%	100.00%	100.00%
MIC Latin America B.V.
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100.00%	100.00%	100.00%
Millicom Africa B.V.
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100.00%	100.00%	100.00%
Millicom Holding B.V.
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100.00%	100.00%	100.00%
Millicom Spain S.L.
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100.00%	100.00%	100.00%

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2018-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2018-01-01
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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