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Schedule of benefits payable (Details)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
BRL (R$)
Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Benefits payable R$ 802,725
Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Benefits payable 767,045
Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Benefits payable 730,608
Later than four years and not later than five years [member]  
IfrsStatementLineItems [Line Items]  
Benefits payable 694,382
Noncurrent liabilities, effects of applying new IFRS  
IfrsStatementLineItems [Line Items]  
Benefits payable 658,918
Later Than Five Years And Not Later Than Fourty Nine Years [Member]  
IfrsStatementLineItems [Line Items]  
Benefits payable 6,304,415
Unified Plan [Member] | Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Benefits payable 508,055
Unified Plan [Member] | Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Benefits payable 482,445
Unified Plan [Member] | Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Benefits payable 457,829
Unified Plan [Member] | Later than four years and not later than five years [member]  
IfrsStatementLineItems [Line Items]  
Benefits payable 434,348
Unified Plan [Member] | Noncurrent liabilities, effects of applying new IFRS  
IfrsStatementLineItems [Line Items]  
Benefits payable 411,209
Unified Plan [Member] | Later Than Five Years And Not Later Than Fourty Nine Years [Member]  
IfrsStatementLineItems [Line Items]  
Benefits payable 3,557,360
Plan I I I [Member] | Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Benefits payable 211,442
Plan I I I [Member] | Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Benefits payable 201,321
Plan I I I [Member] | Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Benefits payable 191,482
Plan I I I [Member] | Later than four years and not later than five years [member]  
IfrsStatementLineItems [Line Items]  
Benefits payable 181,975
Plan I I I [Member] | Noncurrent liabilities, effects of applying new IFRS  
IfrsStatementLineItems [Line Items]  
Benefits payable 172,954
Plan I I I [Member] | Later Than Five Years And Not Later Than Fourty Nine Years [Member]  
IfrsStatementLineItems [Line Items]  
Benefits payable 1,995,374
Assistance Plan [Member] | Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Benefits payable 83,228
Assistance Plan [Member] | Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Benefits payable 83,279
Assistance Plan [Member] | Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Benefits payable 81,297
Assistance Plan [Member] | Later than four years and not later than five years [member]  
IfrsStatementLineItems [Line Items]  
Benefits payable 78,059
Assistance Plan [Member] | Noncurrent liabilities, effects of applying new IFRS  
IfrsStatementLineItems [Line Items]  
Benefits payable 74,755
Assistance Plan [Member] | Later Than Five Years And Not Later Than Fourty Nine Years [Member]  
IfrsStatementLineItems [Line Items]  
Benefits payable R$ 751,681