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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, 2019
Dec. 31, 2018
Disclosure of position of accounts subject to interest rate risk [Line Items]    
Financial assets R$ 1,501,481 R$ 1,424,876
Central Bank compulsory deposits 91,248 94,148
Interbank deposits 34,583 26,420
Securities purchased under agreements to resell 198,428 280,136
Loan and lease operations 585,791 536,091
Derivatives 41,854 23,466
At Fair Value Through Other Comprehensive Income 76,660 49,323
Financial liabilities 1,211,999 1,151,237
Deposits 507,060 463,424
Securities sold under repurchase agreements 256,583 330,237
Interbank market debts 174,862 134,670
Derivatives 47,828 27,519
Structured notes (201) (192)
amortised cost 1,010,644 994,759
At Fair Value Through Profit or Loss 322,929 286,646
Financial liabilities at amortised cost 1,159,830 1,119,734
At Fair Value Through Profit or Loss 48,029 27,711
Interest rate risk [Member]    
Disclosure of position of accounts subject to interest rate risk [Line Items]    
Financial assets 1,435,685 1,373,904
Central Bank compulsory deposits 86,836 88,549
At Fair Value Through Other Comprehensive Income 76,660 49,323
Financial liabilities 1,094,228 1,053,438
Interest rate risk [Member] | Financial liabilities at amortised cost, category [member]    
Disclosure of position of accounts subject to interest rate risk [Line Items]    
Deposits 507,060 463,424
Securities sold under repurchase agreements 256,583 330,237
Interbank market debts 174,862 134,670
Institutional market debts 104,244 93,974
Capitalization plans 3,450 3,422
Financial liabilities at amortised cost 1,046,199 1,025,727
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 47,828 27,519
Structured notes 201 192
Difference asset/ liability (2) 341,457 320,466
At Fair Value Through Profit or Loss 48,029  
Interest rate risk [Member] | Financial assets at amortised cost, category [member]    
Disclosure of position of accounts subject to interest rate risk [Line Items]    
Financial assets   949,386
Interbank deposits 34,581 26,414
Securities purchased under agreements to resell 198,422 280,132
Securities 130,466 106,749
Loan and lease operations 585,791 536,091
amortised cost 949,260  
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 281,075 263,180
Derivatives 41,854 23,466
At Fair Value Through Profit or Loss 322,929 286,646
0-30 days [Member]    
Disclosure of position of accounts subject to interest rate risk [Line Items]    
Derivatives 6,998 3,987
Capitalization plans 454  
Derivatives 6,653 3,168
0-30 days [Member] | Interest rate risk [Member]    
Disclosure of position of accounts subject to interest rate risk [Line Items]    
Financial assets 264,750 277,165
Central Bank compulsory deposits 86,836 88,549
At Fair Value Through Other Comprehensive Income 2,464 1,915
Financial liabilities 517,305 514,263
Cumulative difference R$ (252,555) R$ (237,098)
Ratio of cumulative difference to total interest-bearing assets (17.60%) (17.30%)
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$ 272,447 R$ 248,913
Securities sold under repurchase agreements 218,055 254,052
Interbank market debts 19,086 7,438
Institutional market debts 600 314
Capitalization plans   374
Financial liabilities at amortised cost 510,642 511,091
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 6,653 3,168
Structured notes 10 4
Difference asset/ liability (2) 252,555 237,098
At Fair Value Through Profit or Loss 6,663 3,172
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]    
Financial assets   163,574
Interbank deposits 23,337 19,181
Securities purchased under agreements to resell 22,617 64,677
Securities 1,290 1,007
Loan and lease operations 87,946 78,709
amortised cost 135,190  
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 33,262 19,140
Derivatives 6,998 3,987
At Fair Value Through Profit or Loss 40,260 23,127
31-180 days [Member]    
Disclosure of position of accounts subject to interest rate risk [Line Items]    
Capitalization plans 1,156  
31-180 days [Member] | Interest rate risk [Member]    
Disclosure of position of accounts subject to interest rate risk [Line Items]    
Financial assets 382,751 394,168
Central Bank compulsory deposits 0  
At Fair Value Through Other Comprehensive Income 4,524 4,743
Financial liabilities 113,511 89,354
Cumulative difference R$ 16,685 R$ 67,716
Ratio of cumulative difference to total interest-bearing assets 1.20% 4.90%
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$ 38,873 R$ 36,856
Securities sold under repurchase agreements 4,121 9,713
Interbank market debts 51,776 33,869
Institutional market debts 8,472 3,631
Capitalization plans   1,202
Financial liabilities at amortised cost 104,398 85,271
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 9,100 4,070
Structured notes 13 13
Difference asset/ liability (2) 269,240 304,814
At Fair Value Through Profit or Loss 9,113 4,083
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]    
Financial assets   367,544
Interbank deposits 4,448 4,815
Securities purchased under agreements to resell 175,643 215,352
Securities 13,659 7,320
Loan and lease operations 161,143 140,057
amortised cost 354,893  
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 15,420 17,810
Derivatives 7,914 4,071
At Fair Value Through Profit or Loss 23,334 21,881
181-365 days [Member]    
Disclosure of position of accounts subject to interest rate risk [Line Items]    
Capitalization plans 867  
181-365 days [Member] | Interest rate risk [Member]    
Disclosure of position of accounts subject to interest rate risk [Line Items]    
Financial assets 141,277 100,598
Central Bank compulsory deposits 0  
At Fair Value Through Other Comprehensive Income 3,284 4,026
Financial liabilities 72,484 70,062
Cumulative difference R$ 85,478 R$ 98,252
Ratio of cumulative difference to total interest-bearing assets 6.00% 7.20%
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$ 22,877 R$ 22,063
Securities sold under repurchase agreements 1,700 7,756
Interbank market debts 39,155 31,869
Institutional market debts 4,763 4,579
Capitalization plans   960
Financial liabilities at amortised cost 69,362 67,227
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 3,096 2,815
Structured notes 26 20
Difference asset/ liability (2) 68,793 30,536
At Fair Value Through Profit or Loss 3,122 2,835
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]    
Financial assets   78,314
Interbank deposits 3,290 1,730
Securities purchased under agreements to resell 0  
Securities 14,817 5,792
Loan and lease operations 84,542 70,792
amortised cost 102,649  
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 32,299 15,945
Derivatives 3,045 2,313
At Fair Value Through Profit or Loss 35,344 18,258
From one to five years [member] | Financial liabilities at amortised cost, category [member]    
Disclosure of position of accounts subject to interest rate risk [Line Items]    
Institutional market debts   58,513
Capitalization plans   886
From one to five years [member] | Interest rate risk [Member]    
Disclosure of position of accounts subject to interest rate risk [Line Items]    
Financial assets 443,579 404,069
Central Bank compulsory deposits 0  
At Fair Value Through Other Comprehensive Income 46,456 21,649
Financial liabilities 305,933 319,392
Cumulative difference R$ 223,124 R$ 182,929
Ratio of cumulative difference to total interest-bearing assets 15.50% 13.30%
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$ 154,032 R$ 146,288
Securities sold under repurchase agreements 13,309 40,877
Interbank market debts 63,180 58,375
Institutional market debts 53,452 58,513
Capitalization plans 973 886
Financial liabilities at amortised cost 284,946 304,939
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 20,906 14,360
Structured notes 81 93
Difference asset/ liability (2) 137,646 84,677
At Fair Value Through Profit or Loss 20,987 14,453
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]    
Financial assets   219,186
Interbank deposits 3,474 688
Securities purchased under agreements to resell 0 12
Securities 56,178 50,969
Loan and lease operations 185,210 167,517
amortised cost 244,862  
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 137,612 154,171
Derivatives 14,649 9,063
At Fair Value Through Profit or Loss 152,261 163,234
Over 5 years [member] | Financial liabilities at amortised cost, category [member]    
Disclosure of position of accounts subject to interest rate risk [Line Items]    
Institutional market debts   26,937
Over 5 years [member] | Interest rate risk [Member]    
Disclosure of position of accounts subject to interest rate risk [Line Items]    
Financial assets 203,328 197,904
Central Bank compulsory deposits 0  
At Fair Value Through Other Comprehensive Income 19,932 16,990
Financial liabilities 84,995 60,367
Cumulative difference R$ 341,457 R$ 320,466
Ratio of cumulative difference to total interest-bearing assets 23.80% 23.30%
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$ 18,831 R$ 9,304
Securities sold under repurchase agreements 19,398 17,839
Interbank market debts 1,665 3,119
Institutional market debts 36,957 26,937
Capitalization plans 0  
Financial liabilities at amortised cost 76,851 57,199
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 8,073 3,106
Structured notes 71 62
Difference asset/ liability (2) 118,333 137,537
At Fair Value Through Profit or Loss 8,144 3,168
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]    
Financial assets   120,768
Interbank deposits 32  
Securities purchased under agreements to resell 162 91
Securities 44,522 41,661
Loan and lease operations 66,950 79,016
amortised cost 111,666  
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 62,482 56,114
Derivatives 9,248 4,032
At Fair Value Through Profit or Loss R$ 71,730 R$ 60,146