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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of defined benefit plans [line items] |  |  |
Net assets of the plans | R$ 18,808 | R$ 17,588 | R$ 16,520
4 - Net amount recognized in the balance sheet (1+2+3) | 34 | 345 | 364
Amount recognized in Assets (Note 18a) | 731 | 1,067 | 1,113
Amount recognized in Liabilities (Note 18b) | (697) | (722) | (749)
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 | 20,412 | 19,222 | 17,807
Actuarial liabilities [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Actuarial liabilities | (15,775) | (14,748) | (13,944)
Asset restriction [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Asset restriction (*) | (4,603) | (4,129) | (3,499)
BD and CV Plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
4 - Net amount recognized in the balance sheet (1+2+3) | (349) | (120) | (211)
Amount recognized in Assets (Note 18a) | 66 | 345 | 317
Amount recognized in Liabilities (Note 18b) | (415) | (465) | (528)
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 | 18,808 | 17,588 | 16,520
BD and CV Plans [member] | Actuarial liabilities [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Actuarial liabilities | (15,493) | (14,491) | (13,723)
BD and CV Plans [member] | Asset restriction [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Asset restriction (*) | (3,664) | (3,217) | (3,008)
CD Plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
4 - Net amount recognized in the balance sheet (1+2+3) | 665 | 722 | 796
Amount recognized in Assets (Note 18a) | 665 | 722 | 796
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 | 1,604 | 1,634 | 1,287
CD Plans [member] | Asset restriction [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Asset restriction (*) | (939) | (912) | (491)
Other post employment benefits [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
4 - Net amount recognized in the balance sheet (1+2+3) | (282) | (257) | (221)
Amount recognized in Liabilities (Note 18b) | (282) | (257) | (221)
Other post employment benefits [member] | Actuarial liabilities [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Actuarial liabilities | R$ (282) | R$ (257) | R$ (221)

X
- 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 2017-01-01 -Paragraph 35 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2017-03-01&anchor=para_35_a&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 35 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2017-03-01&anchor=para_35_a_i&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The present value of the defined benefit obligation, less the fair value of the plan assets (if any). [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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