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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, 2021 | Dec. 31, 2020
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Disclosure of Financial Assets [Line Items] |  |
Amortized cost | R$ 1,375,782 | R$ 1,275,799
Government securities - abroad [member] | Chile [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Expected loss |  | (1)
Government securities - abroad [member] | Korea [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Expected loss |  | (4)
Government securities - abroad [member] | Spain [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Expected loss |  | (3)
Government securities - abroad [member] | Mexico [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Expected loss |  | (6)
Financial assets securities [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 147,746 | 129,804
Expected loss | (1,948) | (3,065)
Net amortized cost | 145,798 | 126,739
Financial assets securities [Member] | Brazilian government securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 68,045 | 64,568
Expected loss | (37) | (44)
Net amortized cost | 68,008 | 64,524
Financial assets securities [Member] | Government securities - abroad [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 24,888 | 19,095
Expected loss | (7) | (14)
Net amortized cost | 24,881 | 19,081
Financial assets securities [Member] | Government securities - abroad [member] | Colombia [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 925 | 500
Expected loss | (1) |
Net amortized cost | 924 | 500
Financial assets securities [Member] | Government securities - abroad [member] | Chile [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 828 | 705
Net amortized cost | 828 | 704
Financial assets securities [Member] | Government securities - abroad [member] | Korea [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 5,604 | 3,951
Net amortized cost | 5,604 | 3,947
Financial assets securities [Member] | Government securities - abroad [member] | Spain [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 6,132 | 4,847
Expected loss | (1) |
Net amortized cost | 6,131 | 4,844
Financial assets securities [Member] | Government securities - abroad [member] | Mexico [Member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 11,377 | 9,042
Expected loss | (5) |
Net amortized cost | 11,372 | 9,036
Financial assets securities [Member] | Government securities - abroad [member] | Uruguay [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 22 | 50
Net amortized cost | 22 | 50
Financial assets securities [Member] | Corporate debt securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 54,813 | 46,141
Expected loss | (1,904) | (3,007)
Net amortized cost | 52,909 | 43,134
Financial assets securities [Member] | Rural product note [Member] | Corporate debt securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 5,906 | 3,499
Expected loss | (14) | (25)
Net amortized cost | 5,892 | 3,474
Financial assets securities [Member] | Bank deposit certificates [member] | Corporate debt securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 110 | 30
Expected loss | (1) |
Net amortized cost | 109 | 30
Financial assets securities [Member] | Real estate receivables certificates [member] | Corporate debt securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 3,988 | 4,806
Expected loss | (1) | (12)
Net amortized cost | 3,987 | 4,794
Financial assets securities [Member] | Debentures [member] | Corporate debt securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 39,403 | 34,849
Expected loss | (1,883) | (2,952)
Net amortized cost | 37,520 | 31,897
Financial assets securities [Member] | Eurobonds and others [member] | Corporate debt securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 457 | 209
Expected loss | (2) | (1)
Net amortized cost | 455 | 208
Financial assets securities [Member] | Financial bills [Member] | Corporate debt securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 51 |
Net amortized cost | 51 |
Financial assets securities [Member] | Promissory and commercial notes [Member] | Corporate debt securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 4,219 | 2,023
Expected loss | (2) | (10)
Net amortized cost | 4,217 | 2,013
Financial assets securities [Member] | Other [member] | Corporate debt securities [member] |  |
Disclosure of Financial Assets [Line Items] |  |
Amortized cost | 679 | 725
Expected loss | (1) | (7)
Net amortized cost | R$ 678 | R$ 718

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