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Post-Employment Benefits - Summary of Sensitivity of Defined Benefit Obligation (Detail) R$ in Millions	Dec. 31, 2018 BRL (R$)
BD and CV Plans [member] | Actuarial assumption of interest rates [member] | Actuarial liabilities [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase in assumptions	R$ (718)
Decrease in assumptions	782
BD and CV Plans [member] | Actuarial assumption of interest rates [member] | Stockholders Equity [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase in assumptions	76
Decrease in assumptions	(250)
BD and CV Plans [member] | Actuarial assumption of mortality rates [member] | Actuarial liabilities [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase in assumptions	(160)
Decrease in assumptions	167
BD and CV Plans [member] | Actuarial assumption of mortality rates [member] | Stockholders Equity [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase in assumptions	45
Decrease in assumptions	(48)
Other post employment benefits [member] | Actuarial assumption of interest rates [member] | Actuarial liabilities [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase in assumptions	(15)
Decrease in assumptions	17
Other post employment benefits [member] | Actuarial assumption of interest rates [member] | Stockholders Equity [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase in assumptions	(15)
Decrease in assumptions	17
Other post employment benefits [member] | Actuarial assumption of mortality rates [member] | Actuarial liabilities [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase in assumptions	(6)
Decrease in assumptions	7
Other post employment benefits [member] | Actuarial assumption of mortality rates [member] | Stockholders Equity [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase in assumptions	(6)
Decrease in assumptions	7
Other post employment benefits [member] | Medical care cost [member] | Actuarial liabilities [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase in assumptions	33
Decrease in assumptions	(28)
Other post employment benefits [member] | Medical care cost [member] | Stockholders Equity [Member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase in assumptions	33
Decrease in assumptions	R$ (28)

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- 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 2017-01-01
-Paragraph 145
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- 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
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