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30 Equity (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity valuation adjustments, beginning R$ 785,610 R$ 895,601 R$ 998,466
Adjustments to financial assets available for sale      
Financial investments     3
Taxes on adjustments     (1)
Equity interest investments     26,135
Taxes on adjustments     (8,887)
Adjustments related to actuarial liabilities      
Post employment benefits (186,628) (58,354) (46,506)
Taxes on adjustments 63,444 19,994 16,827
Realization of equity evaluation adjustment      
Deemed cost of fixed assets (100,342) (101,645) (108,561)
Taxes on the adjustments 34,116 34,559 36,911
Gains on Investments in equity investments     (28,650)
Taxes on adjustments     9,741
Equity interest investments   (4,391)  
Attributed to non-controlling interest (4,273) (154) 123
Equity valuation adjustments, ending 591,927 785,610 895,601
Equity Valuation Adjustments [Member]      
Equity valuation adjustments, beginning 790,668 857,754 929,404
Realization of equity evaluation adjustment      
Deemed cost of fixed assets (100,342) (101,645) (108,561)
Taxes on the adjustments 34,116 34,559 36,911
Equity valuation adjustments, ending 724,442 790,668 857,754
Accumulated Other Comprehensive Income [Member]      
Equity valuation adjustments, beginning (5,058) 37,847 69,062
Adjustments to financial assets available for sale      
Financial investments     3
Taxes on adjustments     (1)
Equity interest investments     26,135
Taxes on adjustments     (8,887)
Adjustments related to actuarial liabilities      
Post employment benefits (186,628) (58,354) (46,506)
Taxes on adjustments 63,444 19,994 16,827
Realization of equity evaluation adjustment      
Gains on Investments in equity investments     (28,650)
Taxes on adjustments     9,741
Equity interest investments   (4,391)  
Attributed to non-controlling interest (4,273) (154) 123
Equity valuation adjustments, ending R$ (132,515) R$ (5,058) R$ 37,847