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Capital structure and financing - C.3.4. Finance leases (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) tower | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Cash received from sales and leaseback transaction | $ 141 | $ 167 | $ 0
Finance lease liabilities | 353 | 365 |
Income from tower deal transactions | 65 | 63 | $ 0
Tanzania (excluding Zantel) |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Finance lease liabilities | $ 112 | 121 |
Colombia |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Number of units in agreement | tower | 1,207 |  |
Cumulative number of units transferred | tower | 902 |  |
Agreement price | $ 147 |  |
Cash received from sales and leaseback transaction | 26 | 86 |
Income from tower deal transactions | $ 13 | 37 |
Paraguay |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Number of units in agreement | tower | 1,410 |  |
Cumulative number of units transferred | tower | 1,276 |  |
Agreement price | $ 125 |  |
Cash received from sales and leaseback transaction | 41 | 75 |
Finance lease liabilities | 27 | 21 |
Income from tower deal transactions | $ 19 | 26 |
El Salvador |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Number of units in agreement | tower | 811 |  |
Cumulative number of units transferred | tower | 496 |  |
Agreement price | $ 145 |  |
Cash received from sales and leaseback transaction | 73 | 0 |
Finance lease liabilities | 26 | 20 |
Income from tower deal transactions | 33 | 0 |
Other Geographical Areas |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Finance lease liabilities | 6 | 17 |
Movil | Colombia |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Finance lease liabilities | 83 | 87 |
UNE EPM Telecommunicaciones SA | Colombia |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Finance lease liabilities | $ 99 | $ 100 |

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