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23 Post-employment Benefits (Details 4) - Participants | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Unified Plan [member] |  |
Disclosure of defined benefit plans [line items] |  |
Number of active participants | 22 | 27
Number of inactive participants | 4,274 | 4,337
Total | 4,296 | 4,364
Plan III [member] |  |
Disclosure of defined benefit plans [line items] |  |
Number of active participants | 7,401 | 7,647
Number of inactive participants | 4,633 | 4,324
Total | 12,034 | 11,971
Assistance Plan [member] |  |
Disclosure of defined benefit plans [line items] |  |
Number of active participants | 6,546 | 6,963
Number of inactive participants | 9,032 | 8,433
Number of dependent people | 21,716 | 22,183
Total | 37,294 | 37,579

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