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Loan Operations and Lease Operations Portfolio - Summary of Analysis of Present Value of Minimum Future Payments Receivable From Finance Leases by Maturity (Detail) - BRL (R$) R$ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of loans and lease operations [Line Items]
Minimum future payments	R$ 10,525	R$ 12,515
Future financial income	(2,973)	(4,757)
Present value	7,552	7,758
Current [Member]
Disclosure of loans and lease operations [Line Items]
Minimum future payments	2,007	3,292
Future financial income	(708)	(1,898)
Present value	1,299	1,394
Current [Member] | Up to one year [Member]
Disclosure of loans and lease operations [Line Items]
Minimum future payments	2,007	3,292
Future financial income	(708)	(1,898)
Present value	1,299	1,394
Non-current [Member]
Disclosure of loans and lease operations [Line Items]
Minimum future payments	8,518	9,223
Future financial income	(2,265)	(2,859)
Present value	6,253	6,364
Non-current [Member] | From one to five years [Member]
Disclosure of loans and lease operations [Line Items]
Minimum future payments	4,390	5,334
Future financial income	(2,038)	(2,803)
Present value	2,352	2,531
Non-current [Member] | Over 5 years [Member]
Disclosure of loans and lease operations [Line Items]
Minimum future payments	4,128	3,889
Future financial income	(227)	(56)
Present value	R$ 3,901	R$ 3,833

X

- Definition

The aggregate of: (a) the minimum lease payments receivable by the lessor under a finance lease; and (b) any unguaranteed residual value accruing to the lessor. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 17
-IssueDate 2017-01-01
-Paragraph 47
-Subparagraph a
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-URIDate 2017-03-09

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X

- Definition

The present value of minimum finance lease payments receivable. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 17
-IssueDate 2017-01-01
-Paragraph 47
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_47_a&doctype=Standard&book=B
-URIDate 2017-03-09

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X

- Definition

The difference for a finance lease between: (a) the gross investment in the lease, and (b) the net investment in the lease. The gross investment in the lease is the aggregate of: (a) the minimum lease payments receivable by the lessor under a finance lease; and (b) any unguaranteed residual value accruing to the lessor. The net investment in the lease is the gross investment in the lease discounted at the interest rate implicit in the lease. [Refer: Finance income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 17
-IssueDate 2017-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_47_b&doctype=Standard&book=B
-URIDate 2017-03-09

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- Definition

Disclosure of loans and lease operations

+ References

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