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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, 2019
Dec. 31, 2018
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements R$ 256,583 R$ 330,237
Assets Pledged as Collateral [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements 69,761 77,651
Assets Pledged as Collateral [member] | Government securities - abroad [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements 46,271 46,680
Assets Pledged as Collateral [member] | Corporate debt securities [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements 17,665 9,051
Assets Pledged as Collateral [member] | Own issue [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements 5,258 21,417
Assets Pledged as Collateral [member] | Foreign securities [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements R$ 567 503
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 3.88%  
Assets Pledged as Collateral [member] | Bottom of range [member] | Corporate debt securities [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Percentage of securities sold under repurchase agreements 25.00%  
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 82.50%  
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 0.16%  
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 93.50%  
Assets Pledged as Collateral [member] | Top of range [member] | Corporate debt securities [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Percentage of securities sold under repurchase agreements 89.00%  
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 16.93%  
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 34.90%  
Assets Received as Collateral [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements R$ 140,004 172,953
Assets Received as Collateral [member] | Bottom of range [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Percentage of securities sold under repurchase agreements 3.80%  
Assets Received as Collateral [member] | Top of range [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Percentage of securities sold under repurchase agreements 4.40%  
Right to sell or repledge collateral [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements R$ 46,818 79,633
Right to sell or repledge collateral [member] | Bottom of range [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Percentage of securities sold under repurchase agreements 1.08%  
Right to sell or repledge collateral [member] | Top of range [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Percentage of securities sold under repurchase agreements 6.00%  
Current [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements R$ 223,876 271,521
Current [member] | Assets Pledged as Collateral [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements 67,065 71,231
Current [member] | Assets Pledged as Collateral [member] | Government securities - abroad [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements 46,271 46,676
Current [member] | Assets Pledged as Collateral [member] | Corporate debt securities [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements 17,665 9,051
Current [member] | Assets Pledged as Collateral [member] | Own issue [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements 2,831 15,156
Current [member] | Assets Pledged as Collateral [member] | Foreign securities [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements 298 348
Current [member] | Assets Received as Collateral [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements 140,004 172,953
Current [member] | Right to sell or repledge collateral [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements 16,807 27,337
Non-current [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements 32,707 58,716
Non-current [member] | Assets Pledged as Collateral [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements 2,696 6,420
Non-current [member] | Assets Pledged as Collateral [member] | Government securities - abroad [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements   4
Non-current [member] | Assets Pledged as Collateral [member] | Own issue [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements 2,427 6,261
Non-current [member] | Assets Pledged as Collateral [member] | Foreign securities [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements 269 155
Non-current [member] | Right to sell or repledge collateral [member]    
Disclosure Of Repurchase Agreements [Line Items]    
Securities sold under repurchase agreements R$ 30,011 R$ 52,296