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Risk and Capital Management - Summary of Exposure Weighted by Credit Risk Amount and Ratio Required and Current (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of credit risk exposure [line items] |  |
Common Equity Tier I, Required | R$ 40,108 | R$ 36,813
Tier I (Common Equity Tier I + Additional Tier I Capital), Required | 53,478 | 49,084
Tier II, Required | 0 |
Referential Equity (Tier I + Tier II), Required | 71,304 | 70,559
Common Equity Tier I | 117,328 | 123,358
Additional Tier I Capital | 11,368 | 7,796
Tier I (Common Equity Tier I + Additional Tier I Capital) | 128,696 | 131,154
Tier II | 11,900 | 15,874
Referential Equity (Tier I + Tier II) | R$ 140,596 | R$ 147,028
Common Equity Tier I | 4.50% | 4.50%
Tier I (Common Equity Tier I + Additional Tier I Capital) | 6.00% | 6.00%
Referential Equity (Tier I + Tier II) | 8.00% | 8.625%
Amount Required for Additional Capital Buffers (ACP) | R$ 31,195 | R$ 19,429
Additional Capital Buffers (ACP) | 3.50% | 2.375%
Required ratio [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Additional Tier I Capital, Required | R$ 0 |
Common Equity Tier I | 4.50% | 4.50%
Additional Tier I Capital | 0.00% |
Tier I (Common Equity Tier I + Additional Tier I Capital) | 6.00% | 6.00%
Tier II | 0.00% |
Referential Equity (Tier I + Tier II) | 8.00% | 8.625%
Current ratio [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Common Equity Tier I | 13.20% | 15.10%
Additional Tier I Capital | 0.00% |
Tier I (Common Equity Tier I + Additional Tier I Capital) | 14.40% | 16.00%
Tier II | 0.00% |
Referential Equity (Tier I + Tier II) | 15.80% | 18.00%

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