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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of defined benefit plans [line items] |  |  |
Amounts at the beginning of the period | R$ 345 | R$ 364 | R$ 1,692
Amounts recognized in income (loss) (1+2+3) | (33) | (30) | 145
1 - Cost of current service | (69) | (69) | (62)
2 - Cost of past service | 0 | 0 | 0
3 - Net interest | 36 | 39 | 207
Amounts recognized in stockholders' equity (4+5+6) | (292) | 17 | (1,049)
4 - Effects on asset ceiling | (63) | (289) | (1,877)
5 - Remeasurements | (238) | 310 | 793
6 - Exchange variation | 9 | (4) | 35
Other (7+8+9+10) | 14 | (6) | (424)
7 - Receipt by allocation of funds |  | (12) | (515)
8 - Benefits paid | 19 | 14 | 13
9 - Contributions from sponsor | (16) | (20) | 270
10 - Contributions from parcipants | 11 | 12 | 15
11 - Balance arising from the CorpBanca acquisition (Note 3) |  |  | (207)
Amounts end of the period | 34 | 345 | 364
BD and CV Plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Amounts at the beginning of the period | (120) | (211) | (88)
Amounts recognized in income (loss) (1+2+3) | (75) | (84) | (75)
1 - Cost of current service | (69) | (69) | (62)
2 - Cost of past service | 0 | 0 | 0
3 - Net interest | (6) | (15) | (13)
Amounts recognized in stockholders' equity (4+5+6) | (234) | 92 | (5)
4 - Effects on asset ceiling | (126) | 97 | (633)
5 - Remeasurements | (117) | (1) | 593
6 - Exchange variation | 9 | (4) | 35
Other (7+8+9+10) | 80 | 83 | (43)
9 - Contributions from sponsor | 69 | 71 | 149
10 - Contributions from parcipants | 11 | 12 | 15
11 - Balance arising from the CorpBanca acquisition (Note 3) |  |  | (207)
Amounts end of the period | (349) | (120) | (211)
BD and CV Plans [member] | Net assets [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Amounts at the beginning of the period | 17,588 | 16,520 | 13,633
Amounts recognized in income (loss) (1+2+3) | 1,700 | 1,639 | 1,483
2 - Cost of past service | 0 | 0 | 0
3 - Net interest | 1,700 | 1,639 | 1,483
Amounts recognized in stockholders' equity (4+5+6) | 580 | 487 | 2,300
5 - Remeasurements | 566 | 485 | 2,308
6 - Exchange variation | 14 | 2 | (8)
Other (7+8+9+10) | (1,060) | (1,058) | (896)
8 - Benefits paid | (1,140) | (1,141) | (1,060)
9 - Contributions from sponsor | 69 | 71 | 149
10 - Contributions from parcipants | 11 | 12 | 15
Amounts end of the period | 18,808 | 17,588 | 16,520
BD and CV Plans [member] | Actuarial liabilities [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Amounts at the beginning of the period | (14,491) | (13,723) | (11,587)
Amounts recognized in income (loss) (1+2+3) | (1,454) | (1,416) | (1,317)
1 - Cost of current service | (69) | (69) | (62)
2 - Cost of past service | 0 | 0 | 0
3 - Net interest | (1,385) | (1,347) | (1,255)
Amounts recognized in stockholders' equity (4+5+6) | (688) | (493) | (1,672)
5 - Remeasurements | (683) | (487) | (1,715)
6 - Exchange variation | (5) | (6) | 43
Other (7+8+9+10) | 1,140 | 1,141 | 853
8 - Benefits paid | 1,140 | 1,141 | 1,060
11 - Balance arising from the CorpBanca acquisition (Note 3) |  |  | (207)
Amounts end of the period | (15,493) | (14,491) | (13,723)
BD and CV Plans [member] | Asset restriction [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Amounts at the beginning of the period | (3,217) | (3,008) | (2,134)
Amounts recognized in income (loss) (1+2+3) | (321) | (307) | (241)
2 - Cost of past service | 0 | 0 | 0
3 - Net interest | (321) | (307) | (241)
Amounts recognized in stockholders' equity (4+5+6) | (126) | 98 | (633)
4 - Effects on asset ceiling | (126) | 97 | (633)
5 - Remeasurements |  | 1 |
Amounts end of the period | (3,664) | (3,217) | (3,008)
CD Plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Amounts at the beginning of the period | 722 | 796 | 1,959
Amounts recognized in income (loss) (1+2+3) | 67 | 76 | 239
2 - Cost of past service | 0 | 0 | 0
3 - Net interest | 67 | 76 | 239
Amounts recognized in stockholders' equity (4+5+6) | (39) | (47) | (1,008)
4 - Effects on asset ceiling | 63 | (386) | (1,244)
5 - Remeasurements | (102) | 339 | 236
Other (7+8+9+10) | (85) | (103) | (394)
7 - Receipt by allocation of funds |  | (12) | (515)
9 - Contributions from sponsor | (85) | (91) | 121
Amounts end of the period | 665 | 722 | 796
CD Plans [member] | Net assets [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Amounts at the beginning of the period | 1,634 | 1,287 | 2,229
Amounts recognized in income (loss) (1+2+3) | 157 | 126 | 269
2 - Cost of past service | 0 | 0 | 0
3 - Net interest | 157 | 126 | 269
Amounts recognized in stockholders' equity (4+5+6) | (102) | 324 | (817)
4 - Effects on asset ceiling |  | (15) | (1,053)
5 - Remeasurements | (102) | 339 | 236
Other (7+8+9+10) | (85) | (103) | (394)
7 - Receipt by allocation of funds |  | (12) | (515)
9 - Contributions from sponsor | (85) | (91) | 121
Amounts end of the period | 1,604 | 1,634 | 1,287
CD Plans [member] | Asset restriction [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Amounts at the beginning of the period | (912) | (491) | (270)
Amounts recognized in income (loss) (1+2+3) | (90) | (50) | (30)
2 - Cost of past service | 0 | 0 | 0
3 - Net interest | (90) | (50) | (30)
Amounts recognized in stockholders' equity (4+5+6) | 63 | (371) | (191)
4 - Effects on asset ceiling | 63 | (371) | (191)
Amounts end of the period | (939) | (912) | (491)
Other post employment benefits [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Amounts at the beginning of the period | (257) | (221) | (179)
Amounts recognized in income (loss) (1+2+3) | (25) | (22) | (19)
2 - Cost of past service | 0 | 0 | 0
3 - Net interest | (25) | (22) | (19)
Amounts recognized in stockholders' equity (4+5+6) | (19) | (28) | (36)
5 - Remeasurements | (19) | (28) | (36)
Other (7+8+9+10) | 19 | 14 | 13
8 - Benefits paid | 19 | 14 | 13
Amounts end of the period | R$ (282) | R$ (257) | R$ (221)

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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 2017-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_f&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from business combinations and disposals. [Refer: Business combinations [member]; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_h&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_e&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_b&doctype=Standard -URIDate 2017-03-09 + Details
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