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Risk and Capital Management - Summary of Position of Accounts Subject to Interest Rate Risk (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Financial assets R$ 1,424,876 R$ 1,330,251 R$ 1,246,833
Central Bank compulsory deposits 94,148 98,837  
Interbank deposits 26,420 29,048 22,688
Securities purchased under agreements to resell 280,136 244,707 265,050
Loan and lease operations 536,091 497,719 494,851
Derivatives 23,466 22,843 24,231
At Fair Value Through Other Comprehensive Income 49,323 52,149 40,039
Financial liabilities 1,151,237 1,056,717 1,012,075
Deposits 463,424 402,938 329,414
Securities sold under repurchase agreements 330,237 312,634 349,164
Interbank market debts 134,670 124,587 129,648
Derivatives 27,519 26,746 24,698
Structured notes (192) (465) R$ (519)
Financial assets designated at fair value through profit or loss [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Loan and lease operations   102  
Interest rate risk [Member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Financial assets 1,285,355 1,297,440  
Central Bank compulsory deposits 88,549 94,047  
At Fair Value Through Other Comprehensive Income 49,323 52,149  
Financial liabilities 1,053,438 905,206  
Interest rate risk [Member] | Financial liabilities at amortised cost, category [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Deposits 463,424 402,938  
Securities sold under repurchase agreements 330,237 312,634  
Interbank market debts 134,670 124,587  
Institutional market debts 93,974 98,482  
Capitalization plans 3,422 3,301  
Interest rate risk [Member] | Financial liabilities at fair value through profit or loss, category [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Derivatives 27,519 26,746  
Structured notes 192 465  
Difference asset/ liability (2) 231,917 392,234  
Interest rate risk [Member] | Financial assets at amortised cost, category [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Interbank deposits 26,414 29,048  
Securities purchased under agreements to resell 280,132 244,699  
Securities 106,749 106,242  
Loan and lease operations 536,091 497,719  
Interest rate risk [Member] | Financial assets designated at fair value through profit or loss [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Securities 263,180 248,947  
Derivatives 23,466 22,843  
0-30 days [Member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Derivatives 3,987 7,978  
Derivatives 3,168 7,596  
0-30 days [Member] | Interest rate risk [Member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Financial assets 188,616 268,059  
Central Bank compulsory deposits 88,549 94,047  
At Fair Value Through Other Comprehensive Income 1,915 1,088  
Financial liabilities 513,889 376,492  
Cumulative difference R$ (325,273) R$ (108,433)  
Ratio of cumulative difference to total interest-bearing assets (25.30%) (8.40%)  
0-30 days [Member] | Interest rate risk [Member] | Financial liabilities at amortised cost, category [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Deposits R$ 248,913 R$ 216,842  
Securities sold under repurchase agreements 254,052 208,261  
Interbank market debts 7,438 8,557  
Institutional market debts 314 4,188  
0-30 days [Member] | Interest rate risk [Member] | Financial liabilities at fair value through profit or loss, category [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Derivatives 3,168 7,596  
Structured notes 4 11  
Difference asset/ liability (2) (325,273) (108,433)  
0-30 days [Member] | Interest rate risk [Member] | Financial assets at amortised cost, category [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Interbank deposits 19,181 21,644  
Securities purchased under agreements to resell 64,677 42,612  
Securities 1,007 10,897  
Loan and lease operations 78,709 73,239  
0-30 days [Member] | Interest rate risk [Member] | Financial assets designated at fair value through profit or loss [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Securities 19,140 16,554  
Derivatives 3,987 7,978  
31-180 days [Member] | Interest rate risk [Member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Financial assets 394,168 354,885  
At Fair Value Through Other Comprehensive Income 4,743 2,476  
Financial liabilities 88,152 93,736  
Cumulative difference R$ (19,257) R$ 152,716  
Ratio of cumulative difference to total interest-bearing assets (1.50%) 11.80%  
31-180 days [Member] | Interest rate risk [Member] | Financial liabilities at amortised cost, category [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Deposits R$ 36,856 R$ 33,258  
Securities sold under repurchase agreements 9,713 7,362  
Interbank market debts 33,869 34,097  
Institutional market debts 3,631 16,495  
31-180 days [Member] | Interest rate risk [Member] | Financial liabilities at fair value through profit or loss, category [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Derivatives 4,070 2,491  
Structured notes 13 22  
Difference asset/ liability (2) 306,016 261,149  
31-180 days [Member] | Interest rate risk [Member] | Financial assets at amortised cost, category [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Interbank deposits 4,815 3,510  
Securities purchased under agreements to resell 215,352 201,889  
Securities 7,320 7,921  
Loan and lease operations 140,057 120,231  
31-180 days [Member] | Interest rate risk [Member] | Financial assets designated at fair value through profit or loss [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Securities 17,810 15,855  
Derivatives 4,071 3,003  
181-365 days [Member] | Interest rate risk [Member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Financial assets 100,598 103,785  
At Fair Value Through Other Comprehensive Income 4,026 6,102  
Financial liabilities 69,102 87,850  
Cumulative difference R$ 12,239 R$ 168,651  
Ratio of cumulative difference to total interest-bearing assets 1.00% 13.00%  
181-365 days [Member] | Interest rate risk [Member] | Financial liabilities at amortised cost, category [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Deposits R$ 22,063 R$ 23,239  
Securities sold under repurchase agreements 7,756 25,185  
Interbank market debts 31,869 30,727  
Institutional market debts 4,579 5,343  
181-365 days [Member] | Interest rate risk [Member] | Financial liabilities at fair value through profit or loss, category [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Derivatives 2,815 3,325  
Structured notes 20 22  
Difference asset/ liability (2) 31,496 15,935  
181-365 days [Member] | Interest rate risk [Member] | Financial assets at amortised cost, category [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Interbank deposits 1,730 2,880  
Securities purchased under agreements to resell   2  
Securities 5,792 6,834  
Loan and lease operations 70,792 67,463  
181-365 days [Member] | Interest rate risk [Member] | Financial assets designated at fair value through profit or loss [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Securities 15,945 17,103  
Derivatives 2,313 2,360  
From one to five years [Member] | Interest rate risk [Member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Financial assets 399,075 392,119  
At Fair Value Through Other Comprehensive Income 21,649 23,415  
Financial liabilities 313,240 290,677  
Cumulative difference R$ 98,074 R$ 270,093  
Ratio of cumulative difference to total interest-bearing assets 7.60% 20.80%  
From one to five years [Member] | Interest rate risk [Member] | Financial liabilities at amortised cost, category [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Deposits R$ 146,288 R$ 126,886  
Securities sold under repurchase agreements 40,877 57,146  
Interbank market debts 58,375 47,219  
Institutional market debts 58,513 43,911  
Capitalization plans 3,422 3,301  
From one to five years [Member] | Interest rate risk [Member] | Financial liabilities at fair value through profit or loss, category [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Derivatives 5,672 11,109  
Structured notes 93 319  
Difference asset/ liability (2) 85,835 101,442  
From one to five years [Member] | Interest rate risk [Member] | Financial assets at amortised cost, category [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Interbank deposits 688 1,011  
Securities purchased under agreements to resell 12 28  
Securities 50,969 50,650  
Loan and lease operations 167,517 161,824  
From one to five years [Member] | Interest rate risk [Member] | Financial assets designated at fair value through profit or loss [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Securities 154,171 147,805  
Derivatives 4,069 6,681  
Over 5 years [Member] | Interest rate risk [Member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Financial assets 202,898 178,592  
At Fair Value Through Other Comprehensive Income 16,990 19,068  
Financial liabilities 69,055 56,451  
Cumulative difference R$ 231,917 R$ 392,234  
Ratio of cumulative difference to total interest-bearing assets 18.00% 30.20%  
Over 5 years [Member] | Interest rate risk [Member] | Financial liabilities at amortised cost, category [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Deposits R$ 9,304 R$ 2,713  
Securities sold under repurchase agreements 17,839 14,680  
Interbank market debts 3,119 3,987  
Institutional market debts 26,937 28,545  
Over 5 years [Member] | Interest rate risk [Member] | Financial liabilities at fair value through profit or loss, category [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Derivatives 11,794 2,225  
Structured notes 62 91  
Difference asset/ liability (2) 133,843 122,141  
Over 5 years [Member] | Interest rate risk [Member] | Financial assets at amortised cost, category [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Interbank deposits   3  
Securities purchased under agreements to resell 91 168  
Securities 41,661 29,940  
Loan and lease operations 79,016 74,962  
Over 5 years [Member] | Interest rate risk [Member] | Financial assets designated at fair value through profit or loss [member]      
Disclosure of position of accounts subject to interest rate risk [Line Items]      
Securities 56,114 51,630  
Derivatives R$ 9,026 R$ 2,821