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Capital structure and financing - C.3. Debt and financing (Details) $ in Millions, $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2019 USD ($) | Jul. 31, 2018 USD ($) | Jul. 31, 2018 COP ($)
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Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total non-current financing | $ 5,631 | $ 5,915 |  |  |  |
Less: portion payable within one year | (54) | (129) |  |  |  |
Debt and financing – non-current | 5,578 | 5,786 | [1] | $ 4,123 |  |
Total non-current financing due after more than one year | 59 | 57 |  |  |  |
Debt and financing – current | 113 | 186 | [1] | $ 458 |  |
Borrowings | 5,691 | 5,972 |  |  |  |
Millicom International Cellular S.A. (Luxembourg) |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | 2,504 | 2,773 |  |  |  |
Colombia |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | 803 | 827 |  |  |  |
Paraguay |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | 738 | 502 |  |  |  |
Bolivia |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | 337 | 350 |  |  |  |
Panama |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | 869 | 918 |  |  |  |
Tanzania |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | 203 | 186 |  |  |  |
Costa Rica |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | 119 | 148 |  |  |  |
El Salvador |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | 118 | 268 |  |  |  |
Bilateral Facility With IIC |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings face amount |  |  |  |  | $ 50 | $ 144,054.5
Borrowings, interest rate |  |  |  |  | 9.45% | 9.45%
Bonds |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total non-current financing | 4,253 | 4,067 |  |  |  |
Total non-current financing due after more than one year | 44 | 46 |  |  |  |
Banks |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total non-current financing | 1,337 | 1,805 |  |  |  |
Total non-current financing due after more than one year | 15 | 11 |  |  |  |
Other Borrowings |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total non-current financing | $ 41 | $ 43 |  |  |  |
[1] | The consolidated statement of financial position at December 31, 2019 has been restated after finalization of the purchase accounting of our acquisitions in Nicaragua and Panama (note A.1.2.).

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