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Contingent Assets and Liabilities, Provisions and Legal Obligations - Summary of Changes in Provisions (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of other provisions [line items] |  |
Opening balance | R$ 19,736 |
Closing balance | 18,613 | R$ 19,736
Reclassification of assets pledged as collateral for contingencies | 33,848 | 27,469
Provision for taxes other than income tax [member] |  |
Disclosure of other provisions [line items] |  |
Opening balance | 7,003 | 8,246
(-) Provisions guaranteed by indemnity clause (Note 2.4 n) | (66) | (69)
Subtotal | 6,937 | 8,177
Interest | 384 | 613
Changes in the period reflected in results | (259) | (27)
Increase | 392 | 452
Reversal | (651) | (479)
Payment | (337) | (1,826)
Subtotal | 6,725 | 6,937
(+) Provisions guaranteed by indemnity clause (Note 2.4 n) | 68 | 66
Closing balance | 6,793 | 7,003
Current | 107 | 230
Non-current | 6,686 | 6,773
Opening balance | 5,170 | 4,847
Appropriation of interest | 199 | 344
Changes in the period | (22) | (3)
Deposits made | 251 | 240
Withdrawals | (48) | (202)
Deposits released | (225) | (41)
Closing balance | 5,347 | 5,188
Reclassification of assets pledged as collateral for contingencies | (1) | (18)
Closing balance after reclassification | R$ 5,346 | R$ 5,170

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- Definition The increase (decrease) in other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84&doctype=Standard -URIDate 2017-03-09 + Details
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