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Provisions, contingent assets and contingent liabilities (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Opening balance R$ 19,592  
Closing balance 19,475 R$ 19,592
Closing balance 19,475 19,592
Legal proceedings provision [member]    
IfrsStatementLineItems [Line Items]    
Opening balance 3,317 3,511
Closing balance 3,231 3,317
(-) Provisions guaranteed by indemnity clause (Note 2.4.n) (225) (216)
Subtotal 3,092 3,295
Adjustment / Interest (Note 23) 169 221
Changes in the period reflected in income 903 820
Increase 1,403 1,176
Reversal (500) (356)
Payment (1,140) (1,244)
Subtotal 3,024 3,092
(+) Provisions guaranteed by indemnity clause (Note 2.4.n) 207 225
Closing balance 3,231 3,317
Current 1,157 1,266
Non-current 2,074 2,051
Labor Provision [Member]    
IfrsStatementLineItems [Line Items]    
Opening balance 8,219 8,015
Closing balance 8,186 8,219
(-) Provisions guaranteed by indemnity clause (Note 2.4.n) (879) (950)
Subtotal 7,340 7,065
Adjustment / Interest (Note 23) 491 155
Changes in the period reflected in income 2,339 2,652
Increase 2,663 2,888
Reversal (324) (236)
Payment (2,936) (2,532)
Subtotal 7,234 7,340
(+) Provisions guaranteed by indemnity clause (Note 2.4.n) 952 879
Closing balance 8,186 8,219
Current 2,949 2,528
Non-current 5,237 5,691
Miscellaneous other provisions [member]    
IfrsStatementLineItems [Line Items]    
Opening balance 1,558 1,483
Closing balance 1,844 1,558
Subtotal 1,558  
Adjustment / Interest (Note 23)   1,483
Changes in the period reflected in income 469 85
Increase 469 119
Reversal   (34)
Payment (183) (10)
Subtotal 1,844 1,558
Closing balance 1,844 1,558
Current 605 429
Non-current 1,239 1,129
Civil labor and other provisions [member]    
IfrsStatementLineItems [Line Items]    
Opening balance 13,094 13,009
Closing balance 13,261 13,094
(-) Provisions guaranteed by indemnity clause (Note 2.4.n) (1,104) (1,166)
Subtotal 11,990 11,843
Adjustment / Interest (Note 23) 660 376
Changes in the period reflected in income 3,711 3,557
Increase 4,535 4,183
Reversal (824) (626)
Payment (4,259) (3,786)
Subtotal 12,102 11,990
(+) Provisions guaranteed by indemnity clause (Note 2.4.n) 1,159 1,104
Closing balance 13,261 13,094
Current 4,711 4,223
Non-current R$ 8,550 R$ 8,871