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Securities Sold Under Repurchase Agreements and Interbank and Institutional Market Debts - Summary of Securities Sold Under Repurchase Agreements (Detail) - BRL (R$) R$ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | R$ 252,848 | R$ 273,364
Assets Pledged as Collateral [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 94,980 | 46,525
Assets Pledged as Collateral [member] | Government securities - abroad [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 67,060 | 22,088
Assets Pledged as Collateral [member] | Corporate securities [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 25,676 | 20,773
Assets Pledged as Collateral [member] | Own issue [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 21 | 1,985
Assets Pledged as Collateral [member] | Foreign securities [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | R$ 2,223 | 1,679
Assets Pledged as Collateral [member] | Bottom of range [member] | Government securities - abroad [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 9.15% |
Assets Pledged as Collateral [member] | Bottom of range [member] | Corporate securities [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 45.00% |
Assets Pledged as Collateral [member] | Bottom of range [member] | Own issue [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 16.40% |
Assets Pledged as Collateral [member] | Bottom of range [member] | Foreign securities [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 0.21% |
Assets Pledged as Collateral [member] | Top of range [member] | Government securities - abroad [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 95.00% |
Assets Pledged as Collateral [member] | Top of range [member] | Corporate securities [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 100.00% |
Assets Pledged as Collateral [member] | Top of range [member] | Own issue [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 100.50% |
Assets Pledged as Collateral [member] | Top of range [member] | Foreign securities [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 3.12% |
Assets Received as Collateral [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | R$ 105,036 | 151,370
Assets Received as Collateral [member] | Bottom of range [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 8.80% |
Assets Received as Collateral [member] | Top of range [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 9.15% |
Right to sell or repledge the collateral [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | R$ 52,832 | 75,469
Right to sell or repledge the collateral [member] | Bottom of range [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 0.15% |
Right to sell or repledge the collateral [member] | Top of range [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Percentage of securities sold under repurchase agreements | 10.00% |
Current [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | R$ 243,195 | 247,822
Current [member] | Assets Pledged as Collateral [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 94,899 | 45,961
Current [member] | Assets Pledged as Collateral [member] | Government securities - abroad [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 67,060 | 22,088
Current [member] | Assets Pledged as Collateral [member] | Corporate securities [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 25,676 | 20,773
Current [member] | Assets Pledged as Collateral [member] | Own issue [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 1 | 1,965
Current [member] | Assets Pledged as Collateral [member] | Foreign securities [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 2,162 | 1,135
Current [member] | Assets Received as Collateral [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 105,036 | 151,370
Current [member] | Right to sell or repledge the collateral [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 43,260 | 50,491
Non-current [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 9,653 | 25,542
Non-current [member] | Assets Pledged as Collateral [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 81 | 564
Non-current [member] | Assets Pledged as Collateral [member] | Own issue [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 20 | 20
Non-current [member] | Assets Pledged as Collateral [member] | Foreign securities [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | 61 | 544
Non-current [member] | Right to sell or repledge the collateral [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Securities sold under repurchase agreements | R$ 9,572 | R$ 24,978

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