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24. Post-Employment Benefits (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of defined benefit plans [line items]      
Post-employment benefits R$ 243,750 R$ 237,597 R$ 517,903
Employees      
Disclosure of defined benefit plans [line items]      
Post-employment benefits 242,025 235,907 258,364
Employees | Pension plans      
Disclosure of defined benefit plans [line items]      
Post-employment benefits 78,209 78,680 75,407
Employees | Healthcare plan - post employment      
Disclosure of defined benefit plans [line items]      
Post-employment benefits 97,866 97,511 129,647
Employees | Healthcare plan - active employees      
Disclosure of defined benefit plans [line items]      
Post-employment benefits 86,580 81,617 75,578
Employees | Transfers to construction in progress      
Disclosure of defined benefit plans [line items]      
Post-employment benefits (20,630) (21,901) (22,268)
Management      
Disclosure of defined benefit plans [line items]      
Post-employment benefits 1,725 1,690 1,403
Management | Pension plans      
Disclosure of defined benefit plans [line items]      
Post-employment benefits 1,598 1,500 1,175
Management | Healthcare plan      
Disclosure of defined benefit plans [line items]      
Post-employment benefits R$ 127 R$ 190 R$ 228