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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, 2019 | Dec. 31, 2018
Disclosure of defined benefit plans [line items] |  |
Amounts at the beginning of the period | R$ 34 | R$ 345
Amounts recognized in income (loss) (1+2+3) | (499) | (33)
1 - Cost of current service | (75) | (69)
2 - Cost of past service | (418) | 0
3 - Net interest | (6) | 36
Amounts recognized in stockholders' equity (4+5+6) | (645) | (292)
4 - Effects on asset ceiling | 560 | (63)
5 - Remeasurements | (1,222) | (238)
6 - Exchange variation | 17 | 9
Other (7+8+9+10) | 27 | 14
8 - Benefits paid | 35 | 19
9 - Contributions from sponsor | (18) | (16)
10 - Contributions from parcipants | 10 | 11
Amounts end of the period | (1,083) | 34
BD and CV Plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
Amounts at the beginning of the period | (349) | (120)
Amounts recognized in income (loss) (1+2+3) | (100) | (75)
1 - Cost of current service | (75) | (69)
2 - Cost of past service | 0 | 0
3 - Net interest | (25) | (6)
Amounts recognized in stockholders' equity (4+5+6) | (387) | (234)
4 - Effects on asset ceiling | 384 | (126)
5 - Remeasurements | (788) | (117)
6 - Exchange variation | 17 | 9
Other (7+8+9+10) | 94 | 80
9 - Contributions from sponsor | 84 | 69
10 - Contributions from parcipants | 10 | 11
Amounts end of the period | (742) | (349)
BD and CV Plans [member] | Net assets [member] |  |
Disclosure of defined benefit plans [line items] |  |
Amounts at the beginning of the period | 18,808 | 17,588
Amounts recognized in income (loss) (1+2+3) | 1,769 | 1,700
2 - Cost of past service | 0 | 0
3 - Net interest | 1,769 | 1,700
Amounts recognized in stockholders' equity (4+5+6) | 3,239 | 580
5 - Remeasurements | 3,245 | 566
6 - Exchange variation | (6) | 14
Other (7+8+9+10) | (1,084) | (1,060)
8 - Benefits paid | (1,178) | (1,140)
9 - Contributions from sponsor | 84 | 69
10 - Contributions from parcipants | 10 | 11
Amounts end of the period | 22,732 | 18,808
BD and CV Plans [member] | Actuarial liabilities [member] |  |
Disclosure of defined benefit plans [line items] |  |
Amounts at the beginning of the period | (15,493) | (14,491)
Amounts recognized in income (loss) (1+2+3) | (1,514) | (1,454)
1 - Cost of current service | (75) | (69)
2 - Cost of past service | 0 | 0
3 - Net interest | (1,439) | (1,385)
Amounts recognized in stockholders' equity (4+5+6) | (3,884) | (688)
5 - Remeasurements | (3,907) | (683)
6 - Exchange variation | 23 | (5)
Other (7+8+9+10) | 1,178 | 1,140
8 - Benefits paid | 1,178 | 1,140
Amounts end of the period | (19,713) | (15,493)
BD and CV Plans [member] | Asset restriction [member] |  |
Disclosure of defined benefit plans [line items] |  |
Amounts at the beginning of the period | (3,664) | (3,217)
Amounts recognized in income (loss) (1+2+3) | (355) | (321)
2 - Cost of past service | 0 | 0
3 - Net interest | (355) | (321)
Amounts recognized in stockholders' equity (4+5+6) | 258 | (126)
4 - Effects on asset ceiling | 384 | (126)
5 - Remeasurements | (126) |
Amounts end of the period | (3,761) | (3,664)
CD Plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
Amounts at the beginning of the period | 665 | 722
Amounts recognized in income (loss) (1+2+3) | 60 | 67
2 - Cost of past service | 0 | 0
3 - Net interest | 60 | 67
Amounts recognized in stockholders' equity (4+5+6) | 3 | (39)
4 - Effects on asset ceiling | 176 | 63
5 - Remeasurements | (173) | (102)
Other (7+8+9+10) | (102) | (85)
9 - Contributions from sponsor | (102) | (85)
Amounts end of the period | 626 | 665
CD Plans [member] | Net assets [member] |  |
Disclosure of defined benefit plans [line items] |  |
Amounts at the beginning of the period | 1,604 | 1,634
Amounts recognized in income (loss) (1+2+3) | 151 | 157
2 - Cost of past service | 0 | 0
3 - Net interest | 151 | 157
Amounts recognized in stockholders' equity (4+5+6) | (178) | (102)
5 - Remeasurements | (178) | (102)
Other (7+8+9+10) | (102) | (85)
9 - Contributions from sponsor | (102) | (85)
Amounts end of the period | 1,475 | 1,604
CD Plans [member] | Asset restriction [member] |  |
Disclosure of defined benefit plans [line items] |  |
Amounts at the beginning of the period | (939) | (912)
Amounts recognized in income (loss) (1+2+3) | (91) | (90)
2 - Cost of past service | 0 | 0
3 - Net interest | (91) | (90)
Amounts recognized in stockholders' equity (4+5+6) | 181 | 63
4 - Effects on asset ceiling | 176 | 63
5 - Remeasurements | 5 |
Amounts end of the period | (849) | (939)
Other post employment benefits [member] |  |
Disclosure of defined benefit plans [line items] |  |
Amounts at the beginning of the period | (282) | (257)
Amounts recognized in income (loss) (1+2+3) | (459) | (25)
2 - Cost of past service | (418) | 0
3 - Net interest | (41) | (25)
Amounts recognized in stockholders' equity (4+5+6) | (261) | (19)
5 - Remeasurements | (261) | (19)
Other (7+8+9+10) | 35 | 19
8 - Benefits paid | 35 | 19
Amounts end of the period | R$ (967) | R$ (282)

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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 2019-01-01 -Paragraph 35 -Subparagraph b -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2019-en-r&anchor=para_35_b_v&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [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 2019-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_f&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_a&doctype=Standard -URIDate 2019-03-27 + 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; Net defined benefit liability (asset); Interest expense (income), net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph c -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_c_iv&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_c&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_e&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_b&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_140_a&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_d&doctype=Standard -URIDate 2019-03-27 + Details
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