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24. Post-Employment Benefits (Details 8) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfChangesInActuarialAssetsLineItems [Line Items]      
Fair value of the plan's assets, beginning R$ 7,826,550    
Fair value of the plan's assets, ending 8,642,068 R$ 7,826,550  
Unified Plan      
DisclosureOfChangesInActuarialAssetsLineItems [Line Items]      
Fair value of the plan's assets, beginning 5,834,572 5,478,802 R$ 4,487,550
Return estimated for assets 593,572 546,699 637,541
Contributions and distributions 24,011 30,520 25,724
Benefits paid (414,256) (406,023) (381,274)
Actuarial gain (losses) 252,942 184,574 709,261
Fair value of the plan's assets, ending 6,290,841 5,834,572 5,478,802
Plan III      
DisclosureOfChangesInActuarialAssetsLineItems [Line Items]      
Fair value of the plan's assets, beginning 1,821,055 1,793,516 1,162,969
Return estimated for assets 230,703 202,691 169,429
Contributions and distributions 9,184 10,505 10,174
Benefits paid (133,281) (122,841) (109,146)
Actuarial gain (losses) 250,575 (62,816) 560,090
Fair value of the plan's assets, ending 2,178,236 1,821,055 1,793,516
Assistance Plan      
DisclosureOfChangesInActuarialAssetsLineItems [Line Items]      
Fair value of the plan's assets, beginning 170,923 165,301 162,630
Return estimated for assets 16,579 23,934 23,749
Contributions and distributions 0 0 0
Benefits paid 0 0 0
Actuarial gain (losses) (14,511) (18,312) (21,078)
Fair value of the plan's assets, ending R$ 172,991 R$ 170,923 R$ 165,301