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Schedule of defined benefit plans expense recognised in income statement (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Current service cost R$ 27 R$ 26 R$ 18
Past service cost (1) (415)    
Interest on the actuarial obligation 1,159 1,147 1,213
Expected return on the assets of the Plan 685 (682) (767)
Expense in 2019 according to actuarial calculation (86) 491 464
Current service cost 18   17
Interest on the actuarial obligation     1,214
Pension Plans And Retirement Supplement Plans [member]      
IfrsStatementLineItems [Line Items]      
Current service cost 2 1 1
Past service cost (1)    
Interest on the actuarial obligation 883 887 963
Expected return on the assets of the Plan 685 (682) (767)
Expense in 2019 according to actuarial calculation (200) 206 197
Current service cost 2   1
Interest on the actuarial obligation     963
Health Plan [member]      
IfrsStatementLineItems [Line Items]      
Current service cost 21 21 14
Past service cost (1)    
Interest on the actuarial obligation 232 215 208
Expected return on the assets of the Plan
Expense in 2019 according to actuarial calculation (253) 236 222
Current service cost 16   14
Interest on the actuarial obligation     208
Dental Plan [member]      
IfrsStatementLineItems [Line Items]      
Current service cost 1 1
Past service cost (1)    
Interest on the actuarial obligation 5 4 4
Expected return on the assets of the Plan
Expense in 2019 according to actuarial calculation (6) 5 5
Current service cost  
Interest on the actuarial obligation     5
life insurance [member]      
IfrsStatementLineItems [Line Items]      
Current service cost 3 3  
Past service cost (1) (415)    
Interest on the actuarial obligation 39 41  
Expected return on the assets of the Plan
Expense in 2019 according to actuarial calculation 373 R$ 44 40
Current service cost   2
Interest on the actuarial obligation     R$ 38