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Post-Employment Benefits - Summary of Calculation of Net Amount Recognized in Balance Sheet, Corresponding to Defined Benefit Plan (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of defined benefit plans [line items] |  |
Net assets of the plans | R$ 22,732 | R$ 18,808
4 - Net amount recognized in the balance sheet (1+2+3) | (1,083) | 34
Amount recognized in Assets (Note 18a) | 717 | 731
Amount recognized in Liabilities (Note 18b) | (1,800) | (697)
Defined Benefit Plans and Variable Contribution And Other Post Employment Benefits Plans [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Net assets of the plans | 24,207 | 20,412
Actuarial liabilities [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial liabilities | (20,680) | (15,775)
Asset restriction [member] |  |
Disclosure of defined benefit plans [line items] |  |
Asset restriction (*) | (4,610) | (4,603)
BD and CV Plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
4 - Net amount recognized in the balance sheet (1+2+3) | (742) | (349)
Amount recognized in Assets (Note 18a) | 91 | 66
Amount recognized in Liabilities (Note 18b) | (833) | (415)
BD and CV Plans [member] | Defined Benefit Plans and Variable Contribution And Other Post Employment Benefits Plans [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Net assets of the plans | 22,732 | 18,808
BD and CV Plans [member] | Actuarial liabilities [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial liabilities | (19,713) | (15,493)
BD and CV Plans [member] | Asset restriction [member] |  |
Disclosure of defined benefit plans [line items] |  |
Asset restriction (*) | (3,761) | (3,664)
CD Plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
4 - Net amount recognized in the balance sheet (1+2+3) | 626 | 665
Amount recognized in Assets (Note 18a) | 626 | 665
CD Plans [member] | Defined Benefit Plans and Variable Contribution And Other Post Employment Benefits Plans [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Net assets of the plans | 1,475 | 1,604
CD Plans [member] | Asset restriction [member] |  |
Disclosure of defined benefit plans [line items] |  |
Asset restriction (*) | (849) | (939)
Other post employment benefits [member] |  |
Disclosure of defined benefit plans [line items] |  |
4 - Net amount recognized in the balance sheet (1+2+3) | (967) | (282)
Amount recognized in Liabilities (Note 18b) | (967) | (282)
Other post employment benefits [member] | Actuarial liabilities [member] |  |
Disclosure of defined benefit plans [line items] |  |
Actuarial liabilities | R$ (967) | R$ (282)

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- Definition The amount of assets of a retirement benefit plan less liabilities other than the actuarial present value of promised retirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2019-01-01 -Paragraph 35 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2019-en-r&anchor=para_35_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of assets held by retirement benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2019-01-01 -Paragraph 35 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2019-en-r&anchor=para_35_a_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + Details
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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. + Details
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- 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 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of deficit in a defined benefit plan. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + Details
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