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Post-employment Benefits - Summary of Allocation of Assets by Category, Segmented Into Quoted In an Active Market and Not Quoted In an Active Market (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 21,912 | R$ 23,225
Percentage of allocation | 100.00% | 100.00%
Fixed income securities [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 19,904 | R$ 21,172
Percentage of allocation | 90.80% | 91.20%
Fixed income securities [member] | Quoted in an active market [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 19,508 | R$ 20,804
Percentage of allocation | 89.00% | 89.60%
Fixed income securities [member] | Non quoted in an active market [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 396 | R$ 368
Percentage of allocation | 1.80% | 1.60%
Variable income securities [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 1,323 | R$ 1,387
Percentage of allocation | 6.10% | 5.90%
Variable income securities [member] | Quoted in an active market [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 1,312 | R$ 1,378
Percentage of allocation | 6.00% | 5.90%
Variable income securities [member] | Non quoted in an active market [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 11 | R$ 9
Percentage of allocation | 0.10% | 0.00%
Structured investments [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 150 | R$ 82
Percentage of allocation | 0.70% | 0.40%
Structured investments [member] | Non quoted in an active market [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 150 | R$ 82
Percentage of allocation | 0.70% | 0.40%
Real estate [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 462 | R$ 506
Percentage of allocation | 2.10% | 2.20%
Loans to participants [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair Value | R$ 73 | R$ 78
Percentage of allocation | 0.30% | 0.30%

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with 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 2021-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_57_a&doctype=Standard -URIDate 2021-03-24 + Details
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