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Schedule of assets and actuarial liabilities (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
F A F [Member]    
IfrsStatementLineItems [Line Items]    
Present value of actuarial liabilities R$ 3,340,497 R$ 3,377,234
Fair value of assets (3,547,727)  
Fair value of actuarial assets   (3,553,215)
(Surplus) Deficit (207,230) (175,981)
Irrecoverable surplus - (asset ceiling) 207,230 175,981
Net acturial asset
Beginning balance of irrecoverable surplus 175,981 359,672
Interest on irrecoverable surplus 13,181 26,184
Changes in irrecoverable surplus during the year 18,068 (209,875)
Ending balance of irrecoverable surplus 207,230 175,981
Beginning balance of the present value of liabilities 3,377,234 3,412,120
Interest on actuarial obligations 246,073 242,746
Current service cost 26,741 42,106
Past service cost - plan changes   (4,223)
Benefit paid (169,962) (154,096)
Actuarial losses - experience 325,778 148,984
Actuarial losses - hypothesis (465,367) (310,403)
Ending balance of actuarial liabilities 3,340,497 3,377,234
Beginning balance of the fair value of plan assets (3,553,215) (3,771,792)
Interest income on assets plan (259,254) (268,930)
Benefit paid 169,962 154,096
Return on assets higher (lower) than projection 94,780 333,411
Ending Balance of the fair value of the assets (3,547,727) (3,553,215)
Beginning balance 37,883 28,172
Reversion to accumulated losses (37,883) (28,172)
Actuarial gains (losses) 139,589 161,419
Return on assets higher (lower) than projection (94,780) (333,411)
Changes on irrecoverable surplus (18,068) 209,875
Ending balance 26,741 37,883
Current service costs (26,741) (42,106)
Interest on actuarial obligations (246,073) (242,746)
Projected return on assets 259,254 268,930
Interest on irrecoverable surplus (13,181) (26,184)
Past service cost - plan changes 4,223
Costs recognized in statement of income (26,741) (37,883)
Costs of defined benefit (23,190) (26,741)
Estimated costs for the next period (23,190) (26,741)
Plan I I [Member]    
IfrsStatementLineItems [Line Items]    
Present value of actuarial liabilities 23,981 23,256
Fair value of actuarial assets (22,298) (24,170)
(Surplus) Deficit 1,683 (914)
Irrecoverable surplus - (asset ceiling) 167
Net acturial asset 1,683 (747)
Beginning balance of irrecoverable surplus 167 6,777
Interest on irrecoverable surplus 12 476
Changes in irrecoverable surplus during the year (179) (7,086)
Ending balance of irrecoverable surplus 167
Beginning balance of the present value of liabilities 23,256 19,550
Interest on actuarial obligations 1,627 1,324
Benefit paid (1,712) (1,612)
Actuarial losses - experience 4,278 5,273
Actuarial losses - hypothesis (3,468) (1,279)
Ending balance of actuarial liabilities 23,981 23,256
Beginning balance of the fair value of plan assets (24,170) (29,580)
Interest income on assets plan (1,694) (2,028)
Benefit paid 1,712 1,612
Return on assets higher (lower) than projection 1,854 5,826
Ending Balance of the fair value of the assets (22,298) (24,170)
Beginning balance (2,734) 1,213
Reversion to accumulated losses 2,734 (1,213)
Actuarial gains (losses) (810) (3,994)
Return on assets higher (lower) than projection (1,854) (5,826)
Changes on irrecoverable surplus 179 7,086
Ending balance (2,485) (2,734)
Interest on actuarial obligations (1,627) (1,324)
Projected return on assets 1,694 2,028
Interest on irrecoverable surplus (12) (476)
Costs recognized in statement of income 55 228
Costs of defined benefit (146) 54
Estimated costs for the next period R$ (146) R$ 54