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Risk and Capital Management - Summary of Internal Rating (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | R$ 585,791 | R$ 536,091
Percentage of loan operations and lease operations portfolio | 100.00% | 100.00%
Lower risk [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | R$ 425,140 | R$ 390,382
Satisfactory [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | 97,977 | 92,644
Higher Risk [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | 20,692 | 13,494
Credit impaired [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | 41,982 | 39,571
Stage 1 [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | R$ 501,889 | R$ 459,626
Percentage of loan operations and lease operations portfolio | 85.60% | 85.70%
Stage 1 [member] | Lower risk [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | R$ 420,936 | R$ 385,846
Stage 1 [member] | Satisfactory [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | 80,106 | 72,921
Stage 1 [member] | Higher Risk [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | 847 | 859
Stage 1 [member] | Credit impaired [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | 0 |
Stage 2 [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | R$ 41,920 | R$ 36,894
Percentage of loan operations and lease operations portfolio | 7.20% | 6.90%
Stage 2 [member] | Lower risk [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | R$ 4,204 | R$ 4,536
Stage 2 [member] | Satisfactory [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | 17,871 | 19,723
Stage 2 [member] | Higher Risk [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | 19,845 | 12,635
Stage 2 [member] | Credit impaired [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | 0 |
Stage 3 [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | R$ 41,982 | R$ 39,571
Percentage of loan operations and lease operations portfolio | 7.20% | 7.40%
Stage 3 [member] | Lower risk [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | R$ 0 |
Stage 3 [member] | Satisfactory [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | 0 |
Stage 3 [member] | Higher Risk [Member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | 0 |
Stage 3 [member] | Credit impaired [member] |  |
Disclosure of Credit Quality [Line Items] |  |
Loan operations and lease operations portfolio | R$ 41,982 | R$ 39,571

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