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Derivatives - Disclosure of Portfolio of Credit Derivatives (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | R$ 6,853 | R$ 6,416
Brazilian Government [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 3,772 | 3,597
Government Abroad [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 314 | 329
Private Entities [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 2,767 | 2,490
Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 1,361 | 1,416
Below Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 5,492 | 5,000
Credit default swaps [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 6,853 | 6,416
Up to one year [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 1,685 | 1,200
Up to one year [Member] | Brazilian Government [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 1,167 | 406
Up to one year [Member] | Government Abroad [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 71 | 144
Up to one year [Member] | Private Entities [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 447 | 650
Up to one year [Member] | Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 300 | 449
Up to one year [Member] | Below Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 1,385 | 751
Up to one year [Member] | Credit default swaps [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 1,685 | 1,200
Later than one year and not later than three years [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 1,913 | 2,412
Later than one year and not later than three years [member] | Brazilian Government [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 1,118 | 1,671
Later than one year and not later than three years [member] | Government Abroad [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 85 | 90
Later than one year and not later than three years [member] | Private Entities [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 710 | 651
Later than one year and not later than three years [member] | Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 510 | 347
Later than one year and not later than three years [member] | Below Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 1,403 | 2,065
Later than one year and not later than three years [member] | Credit default swaps [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 1,913 | 2,412
Later than three years and not later than five years [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 3,203 | 2,804
Later than three years and not later than five years [member] | Brazilian Government [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 1,487 | 1,520
Later than three years and not later than five years [member] | Government Abroad [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 156 | 95
Later than three years and not later than five years [member] | Private Entities [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 1,560 | 1,189
Later than three years and not later than five years [member] | Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 539 | 620
Later than three years and not later than five years [member] | Below Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 2,664 | 2,184
Later than three years and not later than five years [member] | Credit default swaps [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 3,203 | R$ 2,804
Over 5 years [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 52 |
Over 5 years [Member] | Government Abroad [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 2 |
Over 5 years [Member] | Private Entities [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 50 |
Over 5 years [Member] | Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 12 |
Over 5 years [Member] | Below Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 40 |
Over 5 years [Member] | Credit default swaps [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | R$ 52 |

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