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23 Post-employment Benefits (Details 7) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Actuarial Obligations [Roll Forward]      
Present value of net actuarial obligations, beginning balance R$ 11,074,608    
Present value of net actuarial obligations, ending balance 11,820,185 R$ 11,074,608  
Unified Plan [member]      
Actuarial Obligations [Roll Forward]      
Present value of net actuarial obligations, beginning balance 6,638,462 5,914,764 R$ 5,352,894
Cost of services 578 560 589
Cost of interest 405,371 477,732 533,201
Benefits paid (456,151) (435,454) (414,256)
Actuarial (gain) losses 172,564 680,860 442,336
Present value of net actuarial obligations, ending balance 6,760,824 6,638,462 5,914,764
Plan III [member]      
Actuarial Obligations [Roll Forward]      
Present value of net actuarial obligations, beginning balance 3,046,536 2,145,661 1,734,568
Cost of services 2,018 4,098 9,604
Cost of interest 183,866 128,075 195,991
Benefits paid (203,342) (174,427) (133,281)
Actuarial (gain) losses 315,645 943,129 338,779
Present value of net actuarial obligations, ending balance 3,344,723 3,046,536 2,145,661
Assistance Plan [member]      
Actuarial Obligations [Roll Forward]      
Present value of net actuarial obligations, beginning balance 1,389,610 1,140,605 1,035,957
Cost of services 20,854 14,306 11,633
Cost of interest 85,561 106,004 102,916
Benefits paid (74) (30) (7)
Actuarial (gain) losses 218,687 128,725 (9,894)
Present value of net actuarial obligations, ending balance R$ 1,714,638 R$ 1,389,610 R$ 1,140,605