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Risk and Capital Management - Maximum Exposure of Other Financial Assets by Type and Classification of Credit Risk (Detail) - BRL (R$) | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | R$ 932,840,000,000 | R$ 1,000,949,000,000
Estimated fair value [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 616,387,000,000 | 625,752,000,000
Estimated fair value [member] | Investment funds [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 20,139,000,000 | 14,204,000,000
Estimated fair value [member] | Brazilian government securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 423,085,000,000 | 483,791,000,000
Estimated fair value [member] | Government securities - abroad [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 60,636,000,000 | 61,693,000,000
Estimated fair value [member] | Government securities - abroad [member] | Argentina [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 1,335,000,000 | 1,498,000,000
Estimated fair value [member] | Government securities - abroad [member] | United States [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 7,189,000,000 | 5,835,000,000
Estimated fair value [member] | Government securities - abroad [member] | Mexico [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 12,413,000,000 | 10,222,000,000
Estimated fair value [member] | Government securities - abroad [member] | Spain [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 6,131,000,000 | 4,844,000,000
Estimated fair value [member] | Government securities - abroad [member] | Korea [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 5,604,000,000 | 3,947,000,000
Estimated fair value [member] | Government securities - abroad [member] | Chile [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 21,399,000,000 | 23,195,000,000
Estimated fair value [member] | Government securities - abroad [member] | Paraguay [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 1,469,000,000 | 2,950,000,000
Estimated fair value [member] | Government securities - abroad [member] | Uruguay [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 1,258,000,000 | 978,000,000
Estimated fair value [member] | Government securities - abroad [member] | Colombia [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 3,830,000,000 | 8,089,000,000
Estimated fair value [member] | Government securities - abroad [member] | Italy [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets |  | 130,000,000
Estimated fair value [member] | Government securities - abroad [member] | Peru [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 8,000,000 | 5,000,000
Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 173,163,000,000 | 127,757,000,000
Estimated fair value [member] | Brazilian external debt bonds [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 362,449,000,000 | 422,098,000,000
Rural product note [Member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 12,744,000,000 | 5,823,000,000
Real estate receivables certificates [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 4,999,000,000 | 5,342,000,000
Bank deposit certificates [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 390,000,000 | 1,066,000,000
Debentures [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 103,659,000,000 | 62,723,000,000
Eurobonds and others [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 10,206,000,000 | 7,604,000,000
Financial bills [Member] | Estimated fair value [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 8,901,000,000 |
Financial bills [Member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 10,168,000,000 | 15,783,000,000
Promissory and Commercial notes [Member] | Estimated fair value [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets |  | 7,629,000,000
Other [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 22,096,000,000 | 21,787,000,000
Stage 1 [member] | Estimated fair value [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 595,456,000,000 | 609,114,000,000
Stage 1 [member] | Estimated fair value [member] | Investment funds [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 4,914,000,000 | 2,997,000,000
Stage 1 [member] | Estimated fair value [member] | Brazilian government securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 423,085,000,000 | 483,791,000,000
Stage 1 [member] | Estimated fair value [member] | Government securities - abroad [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 60,636,000,000 | 61,693,000,000
Stage 1 [member] | Estimated fair value [member] | Government securities - abroad [member] | Argentina [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 1,335,000,000 | 1,498,000,000
Stage 1 [member] | Estimated fair value [member] | Government securities - abroad [member] | United States [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 7,189,000,000 | 5,835,000,000
Stage 1 [member] | Estimated fair value [member] | Government securities - abroad [member] | Mexico [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 12,413,000,000 | 10,222,000,000
Stage 1 [member] | Estimated fair value [member] | Government securities - abroad [member] | Spain [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 6,131,000,000 | 4,844,000,000
Stage 1 [member] | Estimated fair value [member] | Government securities - abroad [member] | Korea [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 5,604,000,000 | 3,947,000,000
Stage 1 [member] | Estimated fair value [member] | Government securities - abroad [member] | Chile [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 21,399,000,000 | 23,195,000,000
Stage 1 [member] | Estimated fair value [member] | Government securities - abroad [member] | Paraguay [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 1,469,000,000 | 2,950,000,000
Stage 1 [member] | Estimated fair value [member] | Government securities - abroad [member] | Uruguay [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 1,258,000,000 | 978,000,000
Stage 1 [member] | Estimated fair value [member] | Government securities - abroad [member] | Colombia [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 3,830,000,000 | 8,089,000,000
Stage 1 [member] | Estimated fair value [member] | Government securities - abroad [member] | Italy [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets |  | 130,000,000
Stage 1 [member] | Estimated fair value [member] | Government securities - abroad [member] | Peru [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 8,000,000 | 5,000,000
Stage 1 [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 167,457,000,000 | 122,326,000,000
Stage 1 [member] | Estimated fair value [member] | Brazilian external debt bonds [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 362,449,000,000 | 422,098,000,000
Stage 1 [member] | At cost [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 601,354,000,000 | 605,404,000,000
Stage 1 [member] | At cost [member] | Investment funds [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 4,906,000,000 | 3,232,000,000
Stage 1 [member] | At cost [member] | Brazilian government securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 426,959,000,000 | 479,477,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 60,976,000,000 | 61,659,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Argentina [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 1,310,000,000 | 1,480,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | United States [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 7,226,000,000 | 5,847,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Mexico [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 12,424,000,000 | 10,227,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Spain [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 6,132,000,000 | 4,847,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Korea [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 5,604,000,000 | 3,951,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Chile [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 21,552,000,000 | 23,183,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Paraguay [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 1,526,000,000 | 3,011,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Uruguay [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 1,256,000,000 | 964,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Colombia [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 3,938,000,000 | 8,012,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Italy [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets |  | 133,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Peru [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 8,000,000 | 4,000,000
Stage 1 [member] | At cost [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 169,489,000,000 | 122,695,000,000
Stage 1 [member] | At cost [member] | Brazilian external debt bonds [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 365,947,000,000 | 417,782,000,000
Stage 1 [member] | Rural product note [Member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 12,597,000,000 | 5,723,000,000
Stage 1 [member] | Rural product note [Member] | At cost [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 12,474,000,000 | 5,717,000,000
Stage 1 [member] | Real estate receivables certificates [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 4,999,000,000 | 5,268,000,000
Stage 1 [member] | Real estate receivables certificates [member] | At cost [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 5,063,000,000 | 5,290,000,000
Stage 1 [member] | Bank deposit certificates [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 390,000,000 | 1,066,000,000
Stage 1 [member] | Bank deposit certificates [member] | At cost [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 392,000,000 | 1,064,000,000
Stage 1 [member] | Debentures [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 98,867,000,000 | 58,365,000,000
Stage 1 [member] | Debentures [member] | At cost [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 99,438,000,000 | 57,963,000,000
Stage 1 [member] | Eurobonds and others [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 10,194,000,000 | 7,604,000,000
Stage 1 [member] | Eurobonds and others [member] | At cost [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 10,236,000,000 | 7,445,000,000
Stage 1 [member] | Financial bills [Member] | Estimated fair value [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 8,901,000,000 |
Stage 1 [member] | Financial bills [Member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 10,168,000,000 | 15,783,000,000
Stage 1 [member] | Financial bills [Member] | At cost [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 8,874,000,000 |
Stage 1 [member] | Financial bills [Member] | At cost [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 10,185,000,000 | 15,784,000,000
Stage 1 [member] | Promissory and Commercial notes [Member] | Estimated fair value [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets |  | 7,629,000,000
Stage 1 [member] | Promissory and Commercial notes [Member] | At cost [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets |  | 7,611,000,000
Stage 1 [member] | Other [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 21,341,000,000 | 20,888,000,000
Stage 1 [member] | Other [member] | At cost [member] | Government securities - abroad [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 36,000,000 | 36,000,000
Stage 1 [member] | Other [member] | At cost [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 22,827,000,000 | 21,821,000,000
Stage 2 [member] | Estimated fair value [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 18,014,000,000 | 13,681,000,000
Stage 2 [member] | Estimated fair value [member] | Investment funds [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 15,225,000,000 | 10,943,000,000
Stage 2 [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 2,789,000,000 | 2,738,000,000
Stage 2 [member] | At cost [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 18,615,000,000 | 14,428,000,000
Stage 2 [member] | At cost [member] | Investment funds [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 15,224,000,000 | 10,943,000,000
Stage 2 [member] | At cost [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 3,391,000,000 | 3,485,000,000
Stage 2 [member] | Rural product note [Member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 121,000,000 | 36,000,000
Stage 2 [member] | Rural product note [Member] | At cost [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 146,000,000 | 38,000,000
Stage 2 [member] | Real estate receivables certificates [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 0 | 73,000,000
Stage 2 [member] | Real estate receivables certificates [member] | At cost [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 0 | 77,000,000
Stage 2 [member] | Debentures [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 1,923,000,000 | 1,779,000,000
Stage 2 [member] | Debentures [member] | At cost [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 2,383,000,000 | 2,402,000,000
Stage 2 [member] | Eurobonds and others [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 12,000,000 |
Stage 2 [member] | Eurobonds and others [member] | At cost [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 12,000,000 |
Stage 2 [member] | Other [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 733,000,000 | 850,000,000
Stage 2 [member] | Other [member] | At cost [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 850,000,000 | 968,000,000
Stage 3 [member] | Estimated fair value [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 2,917,000,000 | 2,957,000,000
Stage 3 [member] | Estimated fair value [member] | Investment funds [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 0 | 264,000,000
Stage 3 [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 2,917,000,000 | 2,693,000,000
Stage 3 [member] | At cost [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 4,993,000,000 | 7,105,000,000
Stage 3 [member] | At cost [member] | Investment funds [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 0 | 1,232,000,000
Stage 3 [member] | At cost [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 4,993,000,000 | 5,873,000,000
Stage 3 [member] | Rural product note [Member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 26,000,000 | 64,000,000
Stage 3 [member] | Rural product note [Member] | At cost [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 38,000,000 | 115,000,000
Stage 3 [member] | Real estate receivables certificates [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 0 | 1,000,000
Stage 3 [member] | Debentures [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 2,869,000,000 | 2,579,000,000
Stage 3 [member] | Debentures [member] | At cost [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 4,704,000,000 | 5,462,000,000
Stage 3 [member] | Other [member] | Estimated fair value [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | 22,000,000 | 49,000,000
Stage 3 [member] | Other [member] | At cost [member] | Corporate debt securities [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Maximum exposure of other financial assets | R$ 251,000,000 | R$ 296,000,000

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