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Post-employment benefits (Details 2) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Amounts at the beginning of the period R$ (2,429) R$ (1,909)
Amounts recognized in income (1+2+3+4) (153) (286)
1 - Cost of current service (29) (28)
3 - Net interest (188) (179)
4 - Other expenses 64 (79)
Amount recognized in stockholders equity (227) (616)
5 - Effects on asset ceiling 296 (42)
6 - Remeasurements (499) (554)
Changes in financial assumptions 3,288 (1,370)
Experience of the plan (3,787) 816
7 - Exchange variation (24) (20)
Other (8+9+10) 749 382
9 - Benefits paid 191 189
10 - Contributions and investments from sponsor 558 193
Amounts at end of the period (2,060) (2,429)
Amount recognized in Assets (Note 18a) 301 343
Amount recognized in Liabilities (Note 18b) (2,361) (2,772)
Defined Benefit Plans And Variable Contribution Plans [Member]    
IfrsStatementLineItems [Line Items]    
Amounts at the beginning of the period (1,966) (1,438)
Amounts recognized in income (1+2+3+4) (186) (164)
1 - Cost of current service (29) (28)
3 - Net interest (157) (136)
Amount recognized in stockholders equity (188) (557)
5 - Effects on asset ceiling 290 (8)
6 - Remeasurements (454) (529)
Changes in financial assumptions 3,197 (1,331)
Experience of the plan (3,651) 802
7 - Exchange variation (24) (20)
Other (8+9+10) 558 193
10 - Contributions and investments from sponsor 558 193
Amounts at end of the period (1,782) (1,966)
Amount recognized in Assets (Note 18a) 17 30
Amount recognized in Liabilities (Note 18b) (1,799) (1,996)
Defined Benefit Plans And Variable Contribution Plans [Member] | Plan assets [member]    
IfrsStatementLineItems [Line Items]    
Amounts at the beginning of the period 23,754 21,933
Amounts recognized in income (1+2+3+4) 2,226 2,193
3 - Net interest 2,226 2,193
Amount recognized in stockholders equity (3,240) 1,136
6 - Remeasurements (3,244) 1,138
Experience of the plan (3,244) 1,138
7 - Exchange variation 4 (2)
Other (8+9+10) (1,250) (1,508)
9 - Benefits paid (1,808) (1,701)
10 - Contributions and investments from sponsor 558 193
Amounts at end of the period 21,490 23,754
Defined Benefit Plans And Variable Contribution Plans [Member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Amounts at the beginning of the period (21,590) (19,637)
Amounts recognized in income (1+2+3+4) (2,015) (1,969)
1 - Cost of current service (29) (28)
3 - Net interest (1,986) (1,941)
Amount recognized in stockholders equity 2,762 (1,685)
6 - Remeasurements 2,790 (1,667)
Changes in financial assumptions 3,197 (1,331)
Experience of the plan (407) (336)
7 - Exchange variation (28) (18)
Other (8+9+10) 1,808 1,701
9 - Benefits paid 1,808 1,701
Amounts at end of the period (19,035) (21,590)
Defined Benefit Plans And Variable Contribution Plans [Member] | Effect of asset ceiling [member]    
IfrsStatementLineItems [Line Items]    
Amounts at the beginning of the period (4,130) (3,734)
Amounts recognized in income (1+2+3+4) (397) (388)
3 - Net interest (397) (388)
Amount recognized in stockholders equity 290 (8)
5 - Effects on asset ceiling 290 (8)
Amounts at end of the period (4,237) (4,130)
Defined Contribution Plans [Member]    
IfrsStatementLineItems [Line Items]    
Amounts at the beginning of the period 313 378
Amounts recognized in income (1+2+3+4) 98 (43)
3 - Net interest 34 36
4 - Other revenues and expenses 64 (79)
Amount recognized in stockholders equity (127) (22)
5 - Effects on asset ceiling 6 (34)
6 - Remeasurements (133) 12
Experience of the plan (133) 12
Amounts at end of the period 284 313
Amount recognized in Assets (Note 18a) 284 313
Defined Contribution Plans [Member] | Plan assets [member]    
IfrsStatementLineItems [Line Items]    
Amounts at the beginning of the period 393 420
Amounts recognized in income (1+2+3+4) 105 (39)
3 - Net interest 41 40
4 - Other revenues and expenses 64 (79)
Amount recognized in stockholders equity (133) 12
6 - Remeasurements (133) 12
Experience of the plan (133) 12
Amounts at end of the period 365 393
Defined Contribution Plans [Member] | Effect of asset ceiling [member]    
IfrsStatementLineItems [Line Items]    
Amounts at the beginning of the period (80) (42)
Amounts recognized in income (1+2+3+4) (7) (4)
3 - Net interest (7) (4)
Amount recognized in stockholders equity 6 (34)
5 - Effects on asset ceiling 6 (34)
Amounts at end of the period (81) (80)
Other Post Employment Benefits [Member]    
IfrsStatementLineItems [Line Items]    
Amounts at the beginning of the period (776) (849)
Amounts recognized in income (1+2+3+4) (65) (79)
3 - Net interest (65) (79)
Amount recognized in stockholders equity 88 (37)
6 - Remeasurements 88 (37)
Changes in financial assumptions 91 (39)
Experience of the plan (3) 2
Other (8+9+10) 191 189
9 - Benefits paid 191 189
Amounts at end of the period (562) (776)
Amount recognized in Liabilities (Note 18b) R$ (562) (776)
2 - Cost of past service