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Post-Employment Benefits - Summary of Changes in Net Amount Recognized in Balance Sheet (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of defined benefit plans [line items] |  |
Amounts at the beginning of the period | R$ (1,498) | R$ (1,029)
Amounts recognized in income (1+2+3+4) | (224) | (255)
1 - Cost of current service | (53) | (80)
2 - Cost of past service |  | (1)
3 - Net interest | (108) | (82)
4 - Other expenses | (63) | (92)
Amounts recognized in stockholders´ equity - other comprehensive income (5+6+7) | 91 | (410)
5 - Effects on asset ceiling | 1,198 | 369
6 - Remeasurements | (1,125) | (736)
Changes in demographic assumptions | 4 | (11)
Changes in financial assumptions | 3,821 | 25
Experience of the plan | (4,950) | (750)
7 - Exchange variation | 18 | (43)
Other (8+9+10) | (85) | 196
8 - Receipt by Destination of Resources (4) | (323) |
9 - Benefits paid | 128 | 115
10 - Contributions and investments from sponsor | 110 | 81
Amounts at end of the period | (1,716) | (1,498)
Amount recognized in Assets (Note 18a) | 493 | 585
Amount recognized in Liabilities (Note 18b) | (2,209) | (2,083)
BD and CV Plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
Amounts at the beginning of the period | (1,079) | (688)
Amounts recognized in income (1+2+3+4) | (131) | (134)
1 - Cost of current service | (53) | (80)
2 - Cost of past service |  | (1)
3 - Net interest | (78) | (53)
Amounts recognized in stockholders´ equity - other comprehensive income (5+6+7) | (282) | (338)
5 - Effects on asset ceiling | 665 | 406
6 - Remeasurements | (965) | (701)
Changes in demographic assumptions | 4 | (11)
Changes in financial assumptions | 3,708 | 13
Experience of the plan | (4,677) | (703)
7 - Exchange variation | 18 | (43)
Other (8+9+10) | 110 | 81
10 - Contributions and investments from sponsor | 110 | 81
Amounts at end of the period | (1,382) | (1,079)
Amount recognized in Assets (Note 18a) | 48 | 82
Amount recognized in Liabilities (Note 18b) | (1,430) | (1,161)
BD and CV Plans [member] | Net assets [member] |  |
Disclosure of defined benefit plans [line items] |  |
Amounts at the beginning of the period | 23,225 | 22,732
Amounts recognized in income (1+2+3+4) | 1,722 | 1,731
2 - Cost of past service | 0 | 0
3 - Net interest | 1,722 | 1,731
Amounts recognized in stockholders´ equity - other comprehensive income (5+6+7) | (1,764) | (75)
6 - Remeasurements | (1,766) | (113)
Experience of the plan | (1,766) | (113)
7 - Exchange variation | 2 | 38
Other (8+9+10) | (1,271) | (1,163)
9 - Benefits paid | (1,381) | (1,244)
10 - Contributions and investments from sponsor | 110 | 81
Amounts at end of the period | 21,912 | 23,225
BD and CV Plans [member] | Actuarial liabilities [member] |  |
Disclosure of defined benefit plans [line items] |  |
Amounts at the beginning of the period | (20,662) | (19,659)
Amounts recognized in income (1+2+3+4) | (1,575) | (1,578)
1 - Cost of current service | (53) | (80)
2 - Cost of past service |  | (1)
3 - Net interest | (1,522) | (1,497)
Amounts recognized in stockholders´ equity - other comprehensive income (5+6+7) | 817 | (669)
6 - Remeasurements | 801 | (588)
Changes in demographic assumptions | 4 | (11)
Changes in financial assumptions | 3,708 | 13
Experience of the plan | (2,911) | (590)
7 - Exchange variation | 16 | (81)
Other (8+9+10) | 1,381 | 1,244
9 - Benefits paid | 1,381 | 1,244
Amounts at end of the period | (20,039) | (20,662)
BD and CV Plans [member] | Asset restriction [member] |  |
Disclosure of defined benefit plans [line items] |  |
Amounts at the beginning of the period | (3,642) | (3,761)
Amounts recognized in income (1+2+3+4) | (278) | (287)
3 - Net interest | (278) | (287)
Amounts recognized in stockholders´ equity - other comprehensive income (5+6+7) | 665 | 406
5 - Effects on asset ceiling | 665 | 406
Amounts at end of the period | (3,255) | (3,642)
CD Plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
Amounts at the beginning of the period | 503 | 626
Amounts recognized in income (1+2+3+4) | (27) | (45)
3 - Net interest | 36 | 47
4 - Other expenses | (63) | (92)
Amounts recognized in stockholders´ equity - other comprehensive income (5+6+7) | 292 | (78)
5 - Effects on asset ceiling | 533 | (37)
6 - Remeasurements | (241) | (41)
Experience of the plan | (241) | (41)
Other (8+9+10) | (323) |
8 - Receipt by Destination of Resources (4) | (323) |
Amounts at end of the period | 445 | 503
Amount recognized in Assets (Note 18a) | 445 | 503
CD Plans [member] | Net assets [member] |  |
Disclosure of defined benefit plans [line items] |  |
Amounts at the beginning of the period | 1,454 | 1,475
Amounts recognized in income (1+2+3+4) | 41 | 20
3 - Net interest | 104 | 112
4 - Other expenses | (63) | (92)
Amounts recognized in stockholders´ equity - other comprehensive income (5+6+7) | (725) | (41)
5 - Effects on asset ceiling | (484) |
6 - Remeasurements | (241) | (41)
Experience of the plan | (241) | (41)
Other (8+9+10) | (323) |
8 - Receipt by Destination of Resources (4) | (323) |
Amounts at end of the period | 447 | 1,454
CD Plans [member] | Asset restriction [member] |  |
Disclosure of defined benefit plans [line items] |  |
Amounts at the beginning of the period | (951) | (849)
Amounts recognized in income (1+2+3+4) | (68) | (65)
3 - Net interest | (68) | (65)
Amounts recognized in stockholders´ equity - other comprehensive income (5+6+7) | 1,017 | (37)
5 - Effects on asset ceiling | 1,017 | (37)
Amounts at end of the period | (2) | (951)
Other post employment benefits [member] |  |
Disclosure of defined benefit plans [line items] |  |
Amounts at the beginning of the period | (922) | (967)
Amounts recognized in income (1+2+3+4) | (66) | (76)
3 - Net interest | (66) | (76)
Amounts recognized in stockholders´ equity - other comprehensive income (5+6+7) | 81 | 6
6 - Remeasurements | 81 | 6
Changes in financial assumptions | 113 | 12
Experience of the plan | (32) | (6)
Other (8+9+10) | 128 | 115
9 - Benefits paid | 128 | 115
Amounts at end of the period | (779) | (922)
Amount recognized in Liabilities (Note 18b) | R$ (779) | R$ (922)

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- Definition The amount of benefits paid or payable for retirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2021-01-01 -Paragraph 35 -Subparagraph b -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2021-en-r&anchor=para_35_b_v&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the gain (loss) on changes in the effect of limiting a net defined benefit asset to the asset ceiling, excluding amounts included in interest income or expense. [Refer: Interest income (expense); Net defined benefit liability (asset); Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 141 -Subparagraph c -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_c_iv&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_e&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_b&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_140_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_d&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition (Deficit) contributions to plan by employer net defined benefit liability (asset). + References No definition available. + Details
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