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Post-employment benefits (Details 1) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
IfrsStatementLineItems [Line Items]
Fair Value	R$ 21,933	R$ 21,912
Percentage of allocation	100.00%	100.00%
Fixed Income Securities 1 [Member]
IfrsStatementLineItems [Line Items]
Fair Value	R$ 20,684	R$ 19,904
Percentage of allocation	94.40%	90.80%
Fixed Income Securities 1 [Member] | Quoted in an active market [member]
IfrsStatementLineItems [Line Items]
Fair Value	R$ 20,102	R$ 19,508
Percentage of allocation	91.70%	89.00%
Fixed Income Securities 1 [Member] | NonQuoted in an active market [member]
IfrsStatementLineItems [Line Items]
Fair Value	R$ 582	R$ 396
Percentage of allocation	2.70%	1.80%
Variable income securities [Member]
IfrsStatementLineItems [Line Items]
Fair Value	R$ 515	R$ 1,323
Percentage of allocation	2.30%	6.10%
Variable income securities [Member] | Quoted in an active market [member]
IfrsStatementLineItems [Line Items]
Fair Value	R$ 508	R$ 1,312
Percentage of allocation	2.30%	6.00%
Variable income securities [Member] | NonQuoted in an active market [member]
IfrsStatementLineItems [Line Items]
Fair Value	R$ 7	R$ 11
Percentage of allocation		10.00%
Structured investments [Member]
IfrsStatementLineItems [Line Items]
Fair Value	R$ 138	R$ 150
Percentage of allocation	0.60%	0.70%
Structured investments [Member] | NonQuoted in an active market [member]
IfrsStatementLineItems [Line Items]
Fair Value	R$ 138	R$ 150
Percentage of allocation	0.60%	0.70%
Real estate 1 [member]
IfrsStatementLineItems [Line Items]
Fair Value	R$ 527	R$ 462
Percentage of allocation	2.40%	2.10%
Loans to participants [Member]
IfrsStatementLineItems [Line Items]
Fair Value	R$ 69	R$ 73
Percentage of allocation	0.30%	0.30%

X

- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2022-03-24
-Paragraph 57
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_57_a&doctype=Standard
-URIDate 2022-03-24

+ Details

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- References

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X

- Definition

Percentage of Allocation of Plan Assets

+ References

No definition available.

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