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Intangibles (Tables)
 12 Months Ended
Dec. 31, 2022
Intangibles Abstract  
Schedule of movements in intangibles
                     
  Notes Goodwill   Concessions     Software   Research and development project   Total
Balance at December 31, 2020   3,298   5,391     76   531   9,296
Additions   -   431     47   -   478
Disposals   -   (7)     -   -   (7)
Amortization   -   (240)     (35)   -   (275)
Acquisition of NLC 16(a) -   1,428     -   -   1,428
Impairment of discontinued operations 16(a) -   (1,422)     -   -   (1,422)
Translation adjustment   (90)   (358)     (2)   (37)   (487)
Balance at December 31, 2021   3,208   5,223     86   494   9,011
Cost   3,208   6,332     516   494   10,550
Accumulated amortization   -   (1,109)     (430)   -   (1,539)
Balance at December 31, 2021   3,208   5,223     86   494   9,011
Additions   -   1,087     39   -   1,126
Disposals   -   (13)     -   -   (13)
Amortization   -   (229)     (43)   -   (272)
Translation adjustment   (19)   366     5   34   386
Balance at December 31, 2022   3,189   6,434     87   528   10,238
Cost   3,189   7,808     564   528   12,089
Accumulated amortization   -   (1,374)     (477)   -   (1,851)
Balance at December 31, 2022   3,189   6,434     87   528   10,238
Schedule of estimated useful lives of intangibles
   
    Useful life
Railway concessions   5 to 37 years
Research and development project   19 years
Software   5 years