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Risk and Capital Management - Maximum Exposure of Other Financial Assets by Type and Classification of Credit Risk (Detail) - BRL (R$)
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets R$ 752,920,000,000 R$ 705,674,000,000
Estimated fair value [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 419,252,000,000 409,084,000,000
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 4,326,000,000 3,513,000,000
Estimated fair value [Member] | Brazilian government securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 327,720,000,000 326,227,000,000
Estimated fair value [Member] | Other Shareholders [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets   297,325,000,000
Estimated fair value [Member] | Government securities - abroad [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 27,548,000,000 28,902,000,000
Estimated fair value [Member] | Government securities - abroad [member] | Argentina [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 1,129,000,000 1,466,000,000
Estimated fair value [Member] | Government securities - abroad [member] | United States [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 2,754,000,000 1,666,000,000
Estimated fair value [Member] | Government securities - abroad [member] | Mexico [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 2,378,000,000 564,000,000
Estimated fair value [Member] | Government securities - abroad [member] | Denmark [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets   1,951,000,000
Estimated fair value [Member] | Government securities - abroad [member] | Spain [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 2,411,000,000 2,937,000,000
Estimated fair value [Member] | Government securities - abroad [member] | Korea [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 1,385,000,000 1,944,000,000
Estimated fair value [Member] | Government securities - abroad [member] | Chile [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 8,211,000,000 9,761,000,000
Estimated fair value [Member] | Government securities - abroad [member] | Paraguay [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 1,530,000,000 1,807,000,000
Estimated fair value [Member] | Government securities - abroad [member] | Uruguay [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 652,000,000 828,000,000
Estimated fair value [Member] | Government securities - abroad [member] | Colombia [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 6,065,000,000 5,945,000,000
Estimated fair value [Member] | Government securities - abroad [member] | Other [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets   33,000,000
Estimated fair value [Member] | Government securities - abroad [member] | ITALY    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 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] | Germany [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 22,000,000  
Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 87,206,000,000 79,344,000,000
Estimated fair value [Member] | Brazilian external debt bonds [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 300,172,000,000  
Rural product note [Member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 4,003,000,000 2,739,000,000
Securitized real estate loans [Member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 10,926,000,000 13,577,000,000
Bank deposit certificates [member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 2,145,000,000 1,150,000,000
Debentures [member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 30,950,000,000 23,758,000,000
Eurobonds and others [member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 6,895,000,000 6,192,000,000
Financial bills [Member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 19,724,000,000 21,230,000,000
Promissory notes [Member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 1,490,000,000 3,614,000,000
Other [member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 11,073,000,000 7,084,000,000
Stage 1 [Member] | Estimated fair value [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 413,976,000,000 404,862,000,000
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 4,129,000,000 3,345,000,000
Stage 1 [Member] | Estimated fair value [Member] | Brazilian government securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 327,546,000,000 326,031,000,000
Stage 1 [Member] | Estimated fair value [Member] | Other Shareholders [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets   297,129,000,000
Stage 1 [Member] | Estimated fair value [Member] | Government securities - abroad [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 27,548,000,000 28,902,000,000
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 1,129,000,000 1,466,000,000
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 2,754,000,000 1,666,000,000
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 2,378,000,000 564,000,000
Stage 1 [Member] | Estimated fair value [Member] | Government securities - abroad [member] | Denmark [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets   1,951,000,000
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 2,411,000,000 2,937,000,000
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 1,385,000,000 1,944,000,000
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 8,211,000,000 9,761,000,000
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 1,530,000,000 1,807,000,000
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 652,000,000 828,000,000
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 6,065,000,000 5,945,000,000
Stage 1 [Member] | Estimated fair value [Member] | Government securities - abroad [member] | Other [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets   33,000,000
Stage 1 [Member] | Estimated fair value [Member] | Government securities - abroad [member] | ITALY    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 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] | Germany [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 22,000,000  
Stage 1 [Member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 82,301,000,000 75,486,000,000
Stage 1 [Member] | Estimated fair value [Member] | Brazilian external debt bonds [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 299,998,000,000  
Stage 1 [Member] | At cost [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 412,507,000,000 403,176,000,000
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 4,335,000,000 3,351,000,000
Stage 1 [Member] | At cost [member] | Brazilian government securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 325,734,000,000 324,585,000,000
Stage 1 [Member] | At cost [member] | Other Shareholders [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 36,000,000 295,671,000,000
Stage 1 [Member] | At cost [member] | Government securities - abroad [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 27,614,000,000 28,914,000,000
Stage 1 [Member] | At cost [member] | Government securities - abroad [member] | Argentina [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 1,121,000,000 1,446,000,000
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 2,770,000,000 1,684,000,000
Stage 1 [Member] | At cost [member] | Government securities - abroad [member] | Mexico [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 2,378,000,000 564,000,000
Stage 1 [Member] | At cost [member] | Government securities - abroad [member] | Denmark [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets   1,951,000,000
Stage 1 [Member] | At cost [member] | Government securities - abroad [member] | Spain [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 2,411,000,000 2,937,000,000
Stage 1 [Member] | At cost [member] | Government securities - abroad [member] | Korea [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 1,385,000,000 1,944,000,000
Stage 1 [Member] | At cost [member] | Government securities - abroad [member] | Chile [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 8,204,000,000 9,765,000,000
Stage 1 [Member] | At cost [member] | Government securities - abroad [member] | Paraguay [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 1,602,000,000 1,922,000,000
Stage 1 [Member] | At cost [member] | Government securities - abroad [member] | Uruguay [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 656,000,000 824,000,000
Stage 1 [Member] | At cost [member] | Government securities - abroad [member] | Colombia [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 6,054,000,000 5,844,000,000
Stage 1 [Member] | At cost [member] | Government securities - abroad [member] | Other [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets   33,000,000
Stage 1 [Member] | At cost [member] | Government securities - abroad [member] | ITALY    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 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] | Germany [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 22,000,000  
Stage 1 [Member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 82,438,000,000 75,240,000,000
Stage 1 [Member] | At cost [member] | Brazilian external debt bonds [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 298,084,000,000  
Stage 1 [Member] | Rural product note [Member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 3,848,000,000 2,511,000,000
Stage 1 [Member] | Rural product note [Member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 3,855,000,000 2,518,000,000
Stage 1 [Member] | Securitized real estate loans [Member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 10,436,000,000 12,501,000,000
Stage 1 [Member] | Securitized real estate loans [Member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 10,419,000,000 12,492,000,000
Stage 1 [Member] | Bank deposit certificates [member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 2,145,000,000 1,150,000,000
Stage 1 [Member] | Bank deposit certificates [member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 2,145,000,000 1,150,000,000
Stage 1 [Member] | Debentures [member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 27,068,000,000 21,569,000,000
Stage 1 [Member] | Debentures [member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 27,306,000,000 21,584,000,000
Stage 1 [Member] | Eurobonds and others [member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 6,895,000,000 6,192,000,000
Stage 1 [Member] | Eurobonds and others [member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 6,950,000,000 6,195,000,000
Stage 1 [Member] | Financial bills [Member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 19,724,000,000 21,230,000,000
Stage 1 [Member] | Financial bills [Member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 19,724,000,000 21,230,000,000
Stage 1 [Member] | Promissory notes [Member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 1,463,000,000 3,596,000,000
Stage 1 [Member] | Promissory notes [Member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 1,465,000,000 3,597,000,000
Stage 1 [Member] | Other [member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 10,722,000,000 6,737,000,000
Stage 1 [Member] | Other [member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 10,574,000,000 6,474,000,000
Stage 2 [Member] | Estimated fair value [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 3,111,000,000 1,305,000,000
Stage 2 [Member] | Estimated fair value [Member] | Brazilian government securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 174,000,000 196,000,000
Stage 2 [Member] | Estimated fair value [Member] | Other Shareholders [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets   196,000,000
Stage 2 [Member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 2,937,000,000 1,109,000,000
Stage 2 [Member] | Estimated fair value [Member] | Brazilian external debt bonds [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 174,000,000  
Stage 2 [Member] | At cost [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 4,140,000,000 1,771,000,000
Stage 2 [Member] | At cost [member] | Brazilian government securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 232,000,000 261,000,000
Stage 2 [Member] | At cost [member] | Other Shareholders [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets   261,000,000
Stage 2 [Member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 3,908,000,000 1,510,000,000
Stage 2 [Member] | At cost [member] | Brazilian external debt bonds [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 232,000,000  
Stage 2 [Member] | Securitized real estate loans [Member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 55,000,000 59,000,000
Stage 2 [Member] | Securitized real estate loans [Member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 55,000,000 64,000,000
Stage 2 [Member] | Debentures [member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 2,557,000,000 969,000,000
Stage 2 [Member] | Debentures [member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 3,323,000,000 1,255,000,000
Stage 2 [Member] | Promissory notes [Member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 15,000,000  
Stage 2 [Member] | Promissory notes [Member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 15,000,000  
Stage 2 [Member] | Other [member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 310,000,000 81,000,000
Stage 2 [Member] | Other [member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 515,000,000 191,000,000
Stage 3 [Member] | Estimated fair value [Member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 2,165,000,000 2,917,000,000
Stage 3 [Member] | Estimated fair value [Member] | Investment funds [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 197,000,000 168,000,000
Stage 3 [Member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 1,968,000,000 2,749,000,000
Stage 3 [Member] | At cost [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 5,875,000,000 8,641,000,000
Stage 3 [Member] | At cost [member] | Investment funds [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 918,000,000 784,000,000
Stage 3 [Member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 4,957,000,000 7,857,000,000
Stage 3 [Member] | Rural product note [Member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 155,000,000 228,000,000
Stage 3 [Member] | Rural product note [Member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 326,000,000 381,000,000
Stage 3 [Member] | Securitized real estate loans [Member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 435,000,000 1,017,000,000
Stage 3 [Member] | Securitized real estate loans [Member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 793,000,000 3,062,000,000
Stage 3 [Member] | Debentures [member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 1,325,000,000 1,220,000,000
Stage 3 [Member] | Debentures [member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 3,563,000,000 3,892,000,000
Stage 3 [Member] | Promissory notes [Member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 12,000,000 18,000,000
Stage 3 [Member] | Promissory notes [Member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 24,000,000 40,000,000
Stage 3 [Member] | Other [member] | Estimated fair value [Member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets 41,000,000 266,000,000
Stage 3 [Member] | Other [member] | At cost [member] | Corporate securities [member]    
Disclosure of Credit Quality [Line Items]    
Maximum exposure of other financial assets R$ 251,000,000 R$ 482,000,000