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23 Post-employment Benefits (Details 8) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]      
Fair value of the plan's assets, ending balance R$ 11,420,196 R$ 10,880,721  
Unified Plan [member]      
Disclosure of defined benefit plans [line items]      
Fair value of the plan's assets, beginning balance 7,546,756 6,290,841 R$ 5,834,572
Return estimated for assets 607,252 685,685 593,572
Contributions and distributions 23,919 23,851 24,011
Benefits paid (456,151) (435,454) (414,256)
Actuarial gain (losses) (153,508) 981,833 252,942
Fair value of the plan's assets, ending balance 7,568,268 7,546,756 6,290,841
Plan III [member]      
Disclosure of defined benefit plans [line items]      
Fair value of the plan's assets, beginning balance 3,137,754 2,178,236 1,821,055
Return estimated for assets 224,591 337,476 230,703
Contributions and distributions 136,708 4,185 9,184
Benefits paid (203,341) (174,427) (133,281)
Actuarial gain (losses) 334,068 792,284 250,575
Fair value of the plan's assets, ending balance 3,629,780 3,137,754 2,178,236
Assistance Plan [member]      
Disclosure of defined benefit plans [line items]      
Fair value of the plan's assets, beginning balance 196,211 172,991 170,923
Return estimated for assets 16,474 51,541 16,579
Contributions and distributions
Benefits paid
Actuarial gain (losses) 9,463 (28,321) (14,511)
Fair value of the plan's assets, ending balance R$ 222,148 R$ 196,211 R$ 172,991