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Risk and Capital Management - Maximum Exposure of Other Financial Assets by Type and Classification of Credit Risk (Detail) - BRL (R$)
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets R$ 765,719,000,000 R$ 752,920,000,000
Estimated fair value [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 488,201,000,000 419,252,000,000
Estimated fair value [member] | Other [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets   5,000,000
Estimated fair value [member] | Investment funds [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 8,267,000,000 4,326,000,000
Estimated fair value [member] | Brazilian government securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 366,998,000,000 327,720,000,000
Estimated fair value [member] | Government securities - abroad [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 39,317,000,000 27,548,000,000
Estimated fair value [member] | Government securities - abroad [member] | Argentina [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 318,000,000 1,129,000,000
Estimated fair value [member] | Government securities - abroad [member] | United States [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 2,977,000,000 2,754,000,000
Estimated fair value [member] | Government securities - abroad [member] | Mexico [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 7,820,000,000 2,378,000,000
Estimated fair value [member] | Government securities - abroad [member] | Spain [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 4,984,000,000 2,411,000,000
Estimated fair value [member] | Government securities - abroad [member] | Korea [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 3,427,000,000 1,385,000,000
Estimated fair value [member] | Government securities - abroad [member] | Chile [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 12,317,000,000 8,211,000,000
Estimated fair value [member] | Government securities - abroad [member] | Paraguay [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 1,782,000,000 1,530,000,000
Estimated fair value [member] | Government securities - abroad [member] | Uruguay [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 710,000,000 652,000,000
Estimated fair value [member] | Government securities - abroad [member] | Colombia [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 4,622,000,000 6,065,000,000
Estimated fair value [member] | Government securities - abroad [member] | Italy [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 329,000,000 115,000,000
Estimated fair value [member] | Government securities - abroad [member] | France [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets   891,000,000
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  
Estimated fair value [member] | Government securities - abroad [member] | Germany [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 23,000,000 22,000,000
Estimated fair value [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 112,936,000,000 87,206,000,000
Estimated fair value [member] | Brazilian external debt bonds [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 327,681,000,000 300,172,000,000
Rural product note [Member] | Estimated fair value [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 5,341,000,000 4,003,000,000
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 7,312,000,000 10,926,000,000
Bank deposit certificates [member] | Estimated fair value [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 3,217,000,000 2,145,000,000
Debentures [member] | Estimated fair value [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 51,510,000,000 30,950,000,000
Eurobonds and others [member] | Estimated fair value [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 5,732,000,000 6,895,000,000
Financial bills [Member] | Estimated fair value [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 18,514,000,000 19,724,000,000
Promissory notes [Member] | Estimated fair value [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 5,311,000,000 1,490,000,000
Other [member] | Estimated fair value [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 15,999,000,000 11,073,000,000
Stage 1 [member] | Estimated fair value [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 483,745,000,000 413,976,000,000
Stage 1 [member] | Estimated fair value [member] | Other [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets   5,000,000
Stage 1 [member] | Estimated fair value [member] | Investment funds [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 8,062,000,000 4,129,000,000
Stage 1 [member] | Estimated fair value [member] | Brazilian government securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 366,998,000,000 327,546,000,000
Stage 1 [member] | Estimated fair value [member] | Government securities - abroad [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 39,317,000,000 27,548,000,000
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 318,000,000 1,129,000,000
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 2,977,000,000 2,754,000,000
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 7,820,000,000 2,378,000,000
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 4,984,000,000 2,411,000,000
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 3,427,000,000 1,385,000,000
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 12,317,000,000 8,211,000,000
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 1,782,000,000 1,530,000,000
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 710,000,000 652,000,000
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 4,622,000,000 6,065,000,000
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 329,000,000 115,000,000
Stage 1 [member] | Estimated fair value [member] | Government securities - abroad [member] | France [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets   891,000,000
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  
Stage 1 [member] | Estimated fair value [member] | Government securities - abroad [member] | Germany [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 23,000,000 22,000,000
Stage 1 [member] | Estimated fair value [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 108,685,000,000 82,301,000,000
Stage 1 [member] | Estimated fair value [member] | Brazilian external debt bonds [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 327,681,000,000 299,998,000,000
Stage 1 [member] | At cost [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 481,569,000,000 412,507,000,000
Stage 1 [member] | At cost [member] | Other [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets   5,000,000
Stage 1 [member] | At cost [member] | Investment funds [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 8,322,000,000 4,335,000,000
Stage 1 [member] | At cost [member] | Brazilian government securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 364,078,000,000 325,734,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 39,405,000,000 27,614,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Argentina [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 349,000,000 1,121,000,000
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 2,979,000,000 2,770,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Mexico [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 7,820,000,000 2,378,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Spain [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 4,984,000,000 2,411,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Korea [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 3,427,000,000 1,385,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Chile [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 12,227,000,000 8,204,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Paraguay [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 1,959,000,000 1,602,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Uruguay [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 716,000,000 656,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Colombia [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 4,585,000,000 6,054,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Italy [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 328,000,000 115,000,000
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | France [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets   891,000,000
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  
Stage 1 [member] | At cost [member] | Government securities - abroad [member] | Germany [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 23,000,000 22,000,000
Stage 1 [member] | At cost [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 109,169,000,000 82,438,000,000
Stage 1 [member] | At cost [member] | Brazilian external debt bonds [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 324,637,000,000 298,120,000,000
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 5,114,000,000 3,848,000,000
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 5,122,000,000 3,855,000,000
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 7,280,000,000 10,436,000,000
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 7,253,000,000 10,419,000,000
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 3,217,000,000 2,145,000,000
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 3,217,000,000 2,145,000,000
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 47,607,000,000 27,068,000,000
Stage 1 [member] | Debentures [member] | At cost [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 47,751,000,000 27,306,000,000
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 5,704,000,000 6,895,000,000
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 5,671,000,000 6,950,000,000
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 18,514,000,000 19,724,000,000
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 18,517,000,000 19,724,000,000
Stage 1 [member] | Promissory notes [Member] | Estimated fair value [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 5,311,000,000 1,463,000,000
Stage 1 [member] | Promissory notes [Member] | At cost [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 5,314,000,000 1,465,000,000
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 15,938,000,000 10,722,000,000
Stage 1 [member] | Other [member] | At cost [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 16,324,000,000 10,574,000,000
Stage 2 [member] | Estimated fair value [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 402,000,000 3,111,000,000
Stage 2 [member] | Estimated fair value [member] | Investment funds [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | Estimated fair value [member] | Brazilian government securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets   174,000,000
Stage 2 [member] | Estimated fair value [member] | Government securities - abroad [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | Estimated fair value [member] | Government securities - abroad [member] | Argentina [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | Estimated fair value [member] | Government securities - abroad [member] | United States [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | Estimated fair value [member] | Government securities - abroad [member] | Mexico [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | Estimated fair value [member] | Government securities - abroad [member] | Spain [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | Estimated fair value [member] | Government securities - abroad [member] | Korea [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | Estimated fair value [member] | Government securities - abroad [member] | Chile [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | Estimated fair value [member] | Government securities - abroad [member] | Paraguay [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | Estimated fair value [member] | Government securities - abroad [member] | Uruguay [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | Estimated fair value [member] | Government securities - abroad [member] | Colombia [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | Estimated fair value [member] | Government securities - abroad [member] | Italy [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | Estimated fair value [member] | Government securities - abroad [member] | Peru [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | Estimated fair value [member] | Government securities - abroad [member] | Germany [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | Estimated fair value [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 402,000,000 2,937,000,000
Stage 2 [member] | Estimated fair value [member] | Brazilian external debt bonds [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0 174,000,000
Stage 2 [member] | At cost [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 637,000,000 4,140,000,000
Stage 2 [member] | At cost [member] | Investment funds [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | At cost [member] | Brazilian government securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets   232,000,000
Stage 2 [member] | At cost [member] | Government securities - abroad [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | At cost [member] | Government securities - abroad [member] | Argentina [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | At cost [member] | Government securities - abroad [member] | United States [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | At cost [member] | Government securities - abroad [member] | Mexico [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | At cost [member] | Government securities - abroad [member] | Spain [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | At cost [member] | Government securities - abroad [member] | Korea [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | At cost [member] | Government securities - abroad [member] | Chile [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | At cost [member] | Government securities - abroad [member] | Paraguay [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | At cost [member] | Government securities - abroad [member] | Uruguay [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | At cost [member] | Government securities - abroad [member] | Colombia [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | At cost [member] | Government securities - abroad [member] | Italy [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | At cost [member] | Government securities - abroad [member] | Peru [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | At cost [member] | Government securities - abroad [member] | Germany [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | At cost [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 637,000,000 3,908,000,000
Stage 2 [member] | At cost [member] | Brazilian external debt bonds [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0 232,000,000
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 58,000,000  
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 62,000,000  
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 11,000,000 55,000,000
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 10,000,000 55,000,000
Stage 2 [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 0  
Stage 2 [member] | Bank deposit certificates [member] | At cost [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0 0
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 283,000,000 2,557,000,000
Stage 2 [member] | Debentures [member] | At cost [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 336,000,000 3,323,000,000
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 28,000,000  
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 29,000,000 0
Stage 2 [member] | Financial bills [Member] | Estimated fair value [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 2 [member] | Financial bills [Member] | At cost [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0 0
Stage 2 [member] | Promissory notes [Member] | Estimated fair value [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0 15,000,000
Stage 2 [member] | Promissory notes [Member] | At cost [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0 15,000,000
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 22,000,000 310,000,000
Stage 2 [member] | Other [member] | At cost [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 200,000,000 515,000,000
Stage 3 [member] | Estimated fair value [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 4,054,000,000 2,165,000,000
Stage 3 [member] | Estimated fair value [member] | Investment funds [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 205,000,000 197,000,000
Stage 3 [member] | Estimated fair value [member] | Government securities - abroad [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | Estimated fair value [member] | Government securities - abroad [member] | Argentina [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | Estimated fair value [member] | Government securities - abroad [member] | United States [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | Estimated fair value [member] | Government securities - abroad [member] | Mexico [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | Estimated fair value [member] | Government securities - abroad [member] | Spain [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | Estimated fair value [member] | Government securities - abroad [member] | Korea [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | Estimated fair value [member] | Government securities - abroad [member] | Chile [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | Estimated fair value [member] | Government securities - abroad [member] | Paraguay [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | Estimated fair value [member] | Government securities - abroad [member] | Uruguay [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | Estimated fair value [member] | Government securities - abroad [member] | Colombia [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | Estimated fair value [member] | Government securities - abroad [member] | Italy [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | Estimated fair value [member] | Government securities - abroad [member] | Peru [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | Estimated fair value [member] | Government securities - abroad [member] | Germany [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | Estimated fair value [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 3,849,000,000 1,968,000,000
Stage 3 [member] | Estimated fair value [member] | Brazilian external debt bonds [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | At cost [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 7,739,000,000 5,875,000,000
Stage 3 [member] | At cost [member] | Investment funds [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 955,000,000 918,000,000
Stage 3 [member] | At cost [member] | Government securities - abroad [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | At cost [member] | Government securities - abroad [member] | Argentina [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | At cost [member] | Government securities - abroad [member] | United States [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | At cost [member] | Government securities - abroad [member] | Mexico [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | At cost [member] | Government securities - abroad [member] | Spain [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | At cost [member] | Government securities - abroad [member] | Korea [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | At cost [member] | Government securities - abroad [member] | Chile [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | At cost [member] | Government securities - abroad [member] | Paraguay [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | At cost [member] | Government securities - abroad [member] | Uruguay [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | At cost [member] | Government securities - abroad [member] | Colombia [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | At cost [member] | Government securities - abroad [member] | Italy [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | At cost [member] | Government securities - abroad [member] | Peru [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | At cost [member] | Government securities - abroad [member] | Germany [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | At cost [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 6,784,000,000 4,957,000,000
Stage 3 [member] | At cost [member] | Brazilian external debt bonds [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
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 169,000,000 155,000,000
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 204,000,000 326,000,000
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 21,000,000 435,000,000
Stage 3 [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 20,000,000 793,000,000
Stage 3 [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 0  
Stage 3 [member] | Bank deposit certificates [member] | At cost [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
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 3,620,000,000 1,325,000,000
Stage 3 [member] | Debentures [member] | At cost [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 6,311,000,000 3,563,000,000
Stage 3 [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 0  
Stage 3 [member] | Eurobonds and others [member] | At cost [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | Financial bills [Member] | Estimated fair value [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | Financial bills [Member] | At cost [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0  
Stage 3 [member] | Promissory notes [Member] | Estimated fair value [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0 12,000,000
Stage 3 [member] | Promissory notes [Member] | At cost [member] | Corporate debt securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 0 24,000,000
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 39,000,000 41,000,000
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$ 249,000,000 R$ 251,000,000