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Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2020
Intangibles |
Schedule of changes in intangibles |
|  |  |  |  |  |  |  |  |  | Research |  |
|  |  |  |  |  |  |  |  |  | and development |  |
|  | Goodwill |  | Concessions |  | Contract right |  | Software |  | project and patents |  | Total
Balance at December 31, 2018 |  | 3,653 |  | 4,061 |  | 137 |  | 111 |  | — |  | 7,962
Additions |  | — |  | 439 |  | — |  | 39 |  | — |  | 478
Disposals |  | — |  | (17) |  | — |  | — |  | — |  | (17)
Amortization |  | — |  | (239) |  | (2) |  | (66) |  | — |  | (307)
Impairment (note 18) |  | — |  | (112) |  | — |  | (11) |  | — |  | (123)
Acquisition of subsidiary |  | — |  | 3 |  | — |  | 1 |  | 724 |  | 728
Translation adjustment |  | (24) |  | (165) |  | 5 |  | 2 |  | (40) |  | (222)
Balance at December 31, 2019 |  | 3,629 |  | 3,970 |  | 140 |  | 76 |  | 684 |  | 8,499
Cost |  | 3,629 |  | 5,090 |  | 248 |  | 888 |  | 684 |  | 10,539
Accumulated amortization |  | — |  | (1,120) |  | (108) |  | (812) |  | — |  | (2,040)
Balance at December 31, 2019 |  | 3,629 |  | 3,970 |  | 140 |  | 76 |  | 684 |  | 8,499
Additions |  | — |  | 2,513 |  | — |  | 29 |  | — |  | 2,542
Disposals |  | — |  | (7) |  | (134) |  | — |  | — |  | (141)
Amortization |  | — |  | (177) |  | (1) |  | (23) |  | — |  | (201)
Translation adjustment |  | (331) |  | (908) |  | (5) |  | (6) |  | (153) |  | (1,403)
Balance at December 31, 2020 |  | 3,298 |  | 5,391 |  | — |  | 76 |  | 531 |  | 9,296
Cost |  | 3,298 |  | 6,393 |  | 102 |  | 743 |  | 531 |  | 11,067
Accumulated amortization |  | — |  | (1,002) |  | (102) |  | (667) |  | — |  | (1,771)
Balance at December 31, 2020 |  | 3,298 |  | 5,391 |  | — |  | 76 |  | 531 |  | 9,296
Schedule of estimated useful lives of intangibles |
|  | Useful life
Railways concessions |  | 3 to 50 years
Usufruct |  | 22 to 31 years
Software |  | 5 years

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