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Financial Assets at Amortized Cost-Securities - Summary of Financial Assets at Amortized Cost - Securities (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of Financial Assets [Line Items] |  |
Amortized cost | R$ 1,010,644 | R$ 994,759
Financial assets securities [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 133,119 | 110,395
Expected loss | (2,653) | (3,646)
Net amortized cost | 130,466 | 106,749
Financial assets securities [Member] | Brazilian government securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 56,355 | 54,064
Expected loss | (52) | (58)
Net amortized cost | 56,303 | 54,006
Financial assets securities [Member] | Government securities - abroad [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 17,226 | 6,700
Expected loss | 0 | (3)
Net amortized cost | 17,226 | 6,697
Financial assets securities [Member] | Government securities - abroad [member] | Colombia [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 335 | 356
Expected loss | 0 | (3)
Net amortized cost | 335 | 353
Financial assets securities [Member] | Government securities - abroad [member] | Chile [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 621 | 256
Net amortized cost | 621 | 256
Financial assets securities [Member] | Government securities - abroad [member] | Korea [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 3,427 | 1,385
Net amortized cost | 3,427 | 1,385
Financial assets securities [Member] | Government securities - abroad [member] | Spain [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 4,984 | 2,411
Net amortized cost | 4,984 | 2,411
Financial assets securities [Member] | Government securities - abroad [member] | United States [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 80 | 19
Net amortized cost | 80 | 19
Financial assets securities [Member] | Government securities - abroad [member] | Mexico [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 7,763 | 2,258
Net amortized cost | 7,763 | 2,258
Financial assets securities [Member] | Government securities - abroad [member] | Uruguay [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 16 | 15
Net amortized cost | 16 | 15
Financial assets securities [Member] | Corporate debt securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 59,538 | 49,631
Expected loss | (2,601) | (3,585)
Net amortized cost | 56,937 | 46,046
Financial assets securities [Member] | Rural product note [Member] | Corporate debt securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 5,388 | 4,181
Expected loss | (47) | (178)
Net amortized cost | 5,341 | 4,003
Financial assets securities [Member] | Bank deposit certificates [member] | Corporate debt securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 54 | 123
Net amortized cost | 54 | 123
Financial assets securities [Member] | Real estate receivables certificates [member] | Corporate debt securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 5,844 | 9,876
Expected loss | (2) | (361)
Net amortized cost | 5,842 | 9,515
Financial assets securities [Member] | Debentures [member] | Corporate debt securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 41,053 | 29,001
Expected loss | (2,532) | (3,013)
Net amortized cost | 38,521 | 25,988
Financial assets securities [Member] | Eurobonds and others [member] | Corporate debt securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 1,083 | 4,005
Expected loss | (1) | (2)
Net amortized cost | 1,082 | 4,003
Financial assets securities [Member] | Promissory notes [Member] | Corporate debt securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 5,001 | 1,069
Expected loss | (3) | (14)
Net amortized cost | 4,998 | 1,055
Financial assets securities [Member] | Other [member] | Corporate debt securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 1,115 | 1,376
Expected loss | (16) | (17)
Net amortized cost | R$ 1,099 | R$ 1,359

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