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Risk and Capital Management - Maximum Exposure of Other financial assets Segregated by Business Sector (Detail) - BRL (R$) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of credit risk exposure [line items] |  |
Other financial assets | R$ 932,840,000,000 | R$ 1,000,949,000,000
Other financial assets percentage | 100.00% | 100.00%
Public sector [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Other financial assets | R$ 580,619,000,000 | R$ 713,705,000,000
Other financial assets percentage | 62.20% | 71.20%
Services [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Other financial assets | R$ 150,831,000,000 | R$ 79,788,000,000
Other financial assets percentage | 16.20% | 8.00%
Other sectors [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Other financial assets | R$ 83,521,000,000 | R$ 67,636,000,000
Other financial assets percentage | 9.00% | 6.80%
Financial [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Other financial assets | R$ 117,869,000,000 | R$ 139,820,000,000
Other financial assets percentage | 12.60% | 14.00%

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