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The Millicom Group - A.1.2. Acquisition of subsidiaries (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 13, 2018 | Oct. 07, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract] |  |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  | $ 403 |
Net loss of combined entity as if combination occurred at beginning of period |  |  | 59 |
Amortisation of combined entity |  |  | 85 |
Cable Onda S.A |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Percentage of controlling interest acquired |  | 80.00% |  |
Enterprise value of acquired entity |  | $ 1,460 |  |
Percentage ownership help by non-controlling interest | 20.00% | 20.00% |  |
Cash transferred | $ 956 |  |  |
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract] |  |  |  |
Intangible assets (excluding goodwill), net |  | $ 673 |  |
Property, plant and equipment, net |  | 348 |  |
Current assets (excluding cash) |  | 54 |  |
Cash and cash equivalents |  | 12 |  |
Total assets acquired |  | 1,088 |  |
Non-current liabilities |  | 422 |  |
Current liabilities |  | 141 |  |
Total liabilities assumed |  | 563 |  |
Fair value of assets acquired and liabilities assumed, net |  | 525 |  |
Transaction costs assumed by Cable Onda |  | 30 |  |
Fair value of non-controlling interest in Cable Onda (20%) |  | 111 |  |
Millicom’s interest in the fair value of Cable Onda (80%) |  | 444 |  |
Acquisition price |  | 956 |  |
Provisional Goodwill |  | 512 |  |
Indemnification assets |  | 4 |  |
Fair value of acquired receivables |  | 34 |  |
Deferred tax liabilities |  | 158 |  |
Tax contingent liabilities |  | 5 |  |
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  | 11 |  |
Revenue of acquiree since acquisition date |  |  | 17 |
Net loss of acquiree since acquisition date |  |  | 7 |
Cable Onda S.A | Bridge Facility |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Borrowings face amount |  | 250 |  |
Cable Onda S.A | 6.625% Notes |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Borrowings face amount |  | $ 500 |  |
Borrowings, interest rate |  | 6.625% |  |
Cable Onda S.A | Trademarks |  |  |  |
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract] |  |  |  |
Intangible assets (excluding goodwill), net |  | $ 280 |  |
Intangible assets useful lives |  | 3 years |  |
Cable Onda S.A | Customer lists |  |  |  |
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract] |  |  |  |
Intangible assets (excluding goodwill), net |  | $ 370 |  |
Intangible assets useful lives |  | 20 years |  |
Cable Onda S.A | Favorable content contracts |  |  |  |
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract] |  |  |  |
Intangible assets (excluding goodwill), net |  | $ 19 |  |
Intangible assets useful lives |  | 10 years |  |
Aggregated individually immaterial business combinations |  |  |  |
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract] |  |  |  |
Acquisition price |  |  | 9 |
TV Cable Parana |  |  |  |
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract] |  |  |  |
Acquisition price |  |  |  | $ 18
Provisional Goodwill |  |  | $ 1 |
Other tangible and intangible assets |  |  |  | 3
TV Cable Parana | Customer lists |  |  |  |
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract] |  |  |  |
Intangible assets (excluding goodwill), net |  |  |  | $ 14

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