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Post-employment benefits (Details 5) R$ in Millions	Dec. 31, 2022 BRL (R$)
Actuarial Assumption Of Interest Rates [Member] | Defined Benefit Plans and Variable Contribution Plans [Member] | Stockholders Equity [Member]
IfrsStatementLineItems [Line Items]
Increase in assumptions	R$ 284
Decrease in assumptions	(311)
Actuarial Assumption Of Interest Rates [Member] | Defined Benefit Plans and Variable Contribution Plans [Member] | Present value of defined benefit obligation [member]
IfrsStatementLineItems [Line Items]
Increase in assumptions	(763)
Decrease in assumptions	824
Actuarial Assumption Of Interest Rates [Member] | Other post employment benefits [member] | Stockholders Equity [Member]
IfrsStatementLineItems [Line Items]
Increase in assumptions	23
Decrease in assumptions	(25)
Actuarial Assumption Of Interest Rates [Member] | Other post employment benefits [member] | Present value of defined benefit obligation [member]
IfrsStatementLineItems [Line Items]
Increase in assumptions	(23)
Decrease in assumptions	25
Actuarial assumption of mortality rates [member] | Defined Benefit Plans and Variable Contribution Plans [Member] | Stockholders Equity [Member]
IfrsStatementLineItems [Line Items]
Increase in assumptions	82
Decrease in assumptions	(87)
Actuarial assumption of mortality rates [member] | Defined Benefit Plans and Variable Contribution Plans [Member] | Present value of defined benefit obligation [member]
IfrsStatementLineItems [Line Items]
Increase in assumptions	(218)
Decrease in assumptions	228
Actuarial assumption of mortality rates [member] | Other post employment benefits [member] | Stockholders Equity [Member]
IfrsStatementLineItems [Line Items]
Increase in assumptions	10
Decrease in assumptions	(11)
Actuarial assumption of mortality rates [member] | Other post employment benefits [member] | Present value of defined benefit obligation [member]
IfrsStatementLineItems [Line Items]
Increase in assumptions	(10)
Decrease in assumptions	11
Actuarial assumption of medical cost trend rates [member] | Other post employment benefits [member] | Stockholders Equity [Member]
IfrsStatementLineItems [Line Items]
Increase in assumptions	(56)
Decrease in assumptions	48
Actuarial assumption of medical cost trend rates [member] | Other post employment benefits [member] | Present value of defined benefit obligation [member]
IfrsStatementLineItems [Line Items]
Increase in assumptions	56
Decrease in assumptions	R$ (48)

X

- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2022-03-24
-Paragraph 145
-Subparagraph a
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-URIDate 2022-03-24

+ Details

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X

- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2022-03-24
-Paragraph 145
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard
-URIDate 2022-03-24

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- References

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