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23 Post-employment benefits (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of defined benefit plans [line items]      
Post-employment benefits R$ 238,326 R$ 243,750 R$ 237,597
Management [Member]      
Disclosure of defined benefit plans [line items]      
Post-employment benefits 1,560 1,725 1,690
Pension Plans [Member] | Management [Member]      
Disclosure of defined benefit plans [line items]      
Post-employment benefits 1,450 1,598 1,500
Healthcare Plan [Member] | Management [Member]      
Disclosure of defined benefit plans [line items]      
Post-employment benefits 110 127 190
Employees [Member]      
Disclosure of defined benefit plans [line items]      
Post-employment benefits 236,766 242,025 235,907
Employees [Member] | Pension Plans [Member]      
Disclosure of defined benefit plans [line items]      
Post-employment benefits 72,067 78,209 78,680
Employees [Member] | Healthcare Plan - Post Employment [Member]      
Disclosure of defined benefit plans [line items]      
Post-employment benefits 99,578 97,866 97,511
Employees [Member] | Healthcare Plan - Active Employees [Member]      
Disclosure of defined benefit plans [line items]      
Post-employment benefits 87,515 86,580 81,617
Employees [Member] | Transfers To Construction In Progress [Member]      
Disclosure of defined benefit plans [line items]      
Post-employment benefits R$ (22,394) R$ (20,630) R$ (21,901)