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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 |  |

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- Definition The amount of benefits paid or payable for retirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2024-01-01 -Paragraph 35 -Subparagraph b -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=26&code=ifrs-tx-2024-en-r&anchor=para_35_b_v&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the gain (loss) on changes in the effect of limiting a net defined benefit asset to the asset ceiling, excluding amounts included in interest income or expense. [Refer: Interest income (expense); Net defined benefit liability (asset); Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph c -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c_iv&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_140_a&doctype=Standard -URIDate 2024-03-27 + Details
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