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Risk and Capital Management - Summary of Breakdown of Indicators of Credit Quality (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 536,091 R$ 497,719
Percentage of loan operations and lease operations portfolio 100.00% 100.00%
Corporate [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 102,643 R$ 107,647
Small and medium businesses [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 68,812 60,290
Foreign loans - Latin America [member] | Foreign [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 152,072 136,397
Stage 1 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 459,626 R$ 417,386
Percentage of loan operations and lease operations portfolio 85.70% 83.90%
Stage 2 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 36,894 R$ 35,894
Percentage of loan operations and lease operations portfolio 6.90% 7.20%
Stage 3 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 39,571 R$ 44,439
Percentage of loan operations and lease operations portfolio 7.40% 8.90%
Stage 1 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 875,039 R$ 812,334
Percentage of loan operations and lease operations portfolio 100.00% 100.00%
Stage 1 [Member] | Corporate [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 170,113 R$ 180,063
Stage 1 [Member] | Small and medium businesses [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 113,571 97,742
Stage 1 [Member] | Foreign loans - Latin America [member] | Foreign [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 195,640 175,399
Stage 1 [Member] | Stage 1 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 779,230 R$ 713,214
Percentage of loan operations and lease operations portfolio 100.00% 100.00%
Stage 1 [Member] | Stage 1 [Member] | Corporate [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 152,131 R$ 156,353
Stage 1 [Member] | Stage 1 [Member] | Small and medium businesses [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 99,676 82,564
Stage 1 [Member] | Stage 1 [Member] | Foreign loans - Latin America [member] | Foreign [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 174,255 152,384
Stage 1 [Member] | Stage 2 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 50,709 R$ 47,501
Percentage of loan operations and lease operations portfolio 100.00% 100.00%
Stage 1 [Member] | Stage 2 [Member] | Corporate [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 3,986 R$ 5,410
Stage 1 [Member] | Stage 2 [Member] | Small and medium businesses [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 7,778 7,713
Stage 1 [Member] | Stage 2 [Member] | Foreign loans - Latin America [member] | Foreign [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 15,132 16,926
Stage 1 [Member] | Stage 3 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 45,100 R$ 51,619
Percentage of loan operations and lease operations portfolio 100.00% 100.00%
Stage 1 [Member] | Stage 3 [Member] | Corporate [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 13,996 R$ 18,300
Stage 1 [Member] | Stage 3 [Member] | Small and medium businesses [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 6,117 7,465
Stage 1 [Member] | Stage 3 [Member] | Foreign loans - Latin America [member] | Foreign [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 6,253 6,089
Stage 1 [Member] | Loan Operations [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 536,091 R$ 497,719
Percentage of loan operations and lease operations portfolio 61.30% 61.20%
Stage 1 [Member] | Loan Operations [Member] | Corporate [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 102,643 R$ 107,647
Stage 1 [Member] | Loan Operations [Member] | Small and medium businesses [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 68,812 60,290
Stage 1 [Member] | Loan Operations [Member] | Foreign loans - Latin America [member] | Foreign [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 152,072 136,397
Stage 1 [Member] | Loan Operations [Member] | Stage 1 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 459,626 R$ 417,386
Percentage of loan operations and lease operations portfolio 59.00% 58.50%
Stage 1 [Member] | Loan Operations [Member] | Stage 1 [Member] | Corporate [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 90,716 R$ 91,442
Stage 1 [Member] | Loan Operations [Member] | Stage 1 [Member] | Small and medium businesses [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 57,099 47,132
Stage 1 [Member] | Loan Operations [Member] | Stage 1 [Member] | Foreign loans - Latin America [member] | Foreign [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 134,323 117,448
Stage 1 [Member] | Loan Operations [Member] | Stage 2 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 36,894 R$ 35,894
Percentage of loan operations and lease operations portfolio 72.80% 75.50%
Stage 1 [Member] | Loan Operations [Member] | Stage 2 [Member] | Corporate [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 2,222 R$ 3,833
Stage 1 [Member] | Loan Operations [Member] | Stage 2 [Member] | Small and medium businesses [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 5,875 6,001
Stage 1 [Member] | Loan Operations [Member] | Stage 2 [Member] | Foreign loans - Latin America [member] | Foreign [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 11,768 13,028
Stage 1 [Member] | Loan Operations [Member] | Stage 3 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 39,571 R$ 44,439
Percentage of loan operations and lease operations portfolio 87.70% 86.10%
Stage 1 [Member] | Loan Operations [Member] | Stage 3 [Member] | Corporate [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 9,705 R$ 12,372
Stage 1 [Member] | Loan Operations [Member] | Stage 3 [Member] | Small and medium businesses [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 5,838 7,157
Stage 1 [Member] | Loan Operations [Member] | Stage 3 [Member] | Foreign loans - Latin America [member] | Foreign [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 5,981 5,921
Stage 1 [Member] | Commitments To Be Released [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 272,843 R$ 244,126
Percentage of loan operations and lease operations portfolio 31.10% 30.10%
Stage 1 [Member] | Commitments To Be Released [Member] | Corporate [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 16,280 R$ 14,768
Stage 1 [Member] | Commitments To Be Released [Member] | Small and medium businesses [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 42,124 35,095
Stage 1 [Member] | Commitments To Be Released [Member] | Foreign loans - Latin America [member] | Foreign [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 32,302 29,534
Stage 1 [Member] | Commitments To Be Released [Member] | Stage 1 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 259,915 R$ 232,703
Percentage of loan operations and lease operations portfolio 33.30% 32.60%
Stage 1 [Member] | Commitments To Be Released [Member] | Stage 1 [Member] | Corporate [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 16,054 R$ 14,100
Stage 1 [Member] | Commitments To Be Released [Member] | Stage 1 [Member] | Small and medium businesses [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 40,105 33,203
Stage 1 [Member] | Commitments To Be Released [Member] | Stage 1 [Member] | Foreign loans - Latin America [member] | Foreign [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 29,090 25,867
Stage 1 [Member] | Commitments To Be Released [Member] | Stage 2 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 11,670 R$ 9,863
Percentage of loan operations and lease operations portfolio 23.00% 20.80%
Stage 1 [Member] | Commitments To Be Released [Member] | Stage 2 [Member] | Corporate [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 83 R$ 278
Stage 1 [Member] | Commitments To Be Released [Member] | Stage 2 [Member] | Small and medium businesses [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 1,834 1,638
Stage 1 [Member] | Commitments To Be Released [Member] | Stage 2 [Member] | Foreign loans - Latin America [member] | Foreign [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 2,969 3,527
Stage 1 [Member] | Commitments To Be Released [Member] | Stage 3 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 1,258 R$ 1,560
Percentage of loan operations and lease operations portfolio 2.80% 3.00%
Stage 1 [Member] | Commitments To Be Released [Member] | Stage 3 [Member] | Corporate [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 143 R$ 390
Stage 1 [Member] | Commitments To Be Released [Member] | Stage 3 [Member] | Small and medium businesses [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 185 254
Stage 1 [Member] | Commitments To Be Released [Member] | Stage 3 [Member] | Foreign loans - Latin America [member] | Foreign [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 243 140
Stage 1 [Member] | Financial Guarantees [Member] | Stage 1 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 59,689 R$ 63,125
Percentage of loan operations and lease operations portfolio 7.70% 8.90%
Stage 1 [Member] | Financial Guarantees [Member] | Stage 1 [Member] | Corporate [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 45,361 R$ 50,811
Stage 1 [Member] | Financial Guarantees [Member] | Stage 1 [Member] | Small and medium businesses [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 2,472 2,229
Stage 1 [Member] | Financial Guarantees [Member] | Stage 1 [Member] | Foreign loans - Latin America [member] | Foreign [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 10,842 9,069
Stage 1 [Member] | Financial guarantee contracts [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 66,105 R$ 70,489
Percentage of loan operations and lease operations portfolio 7.60% 8.70%
Stage 1 [Member] | Financial guarantee contracts [member] | Corporate [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 51,190 R$ 57,648
Stage 1 [Member] | Financial guarantee contracts [member] | Small and medium businesses [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 2,635 2,357
Stage 1 [Member] | Financial guarantee contracts [member] | Foreign loans - Latin America [member] | Foreign [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 11,266 9,468
Stage 1 [Member] | Financial guarantee contracts [member] | Stage 2 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 2,145 R$ 1,744
Percentage of loan operations and lease operations portfolio 4.20% 3.70%
Stage 1 [Member] | Financial guarantee contracts [member] | Stage 2 [Member] | Corporate [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 1,681 R$ 1,299
Stage 1 [Member] | Financial guarantee contracts [member] | Stage 2 [Member] | Small and medium businesses [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 69 74
Stage 1 [Member] | Financial guarantee contracts [member] | Stage 2 [Member] | Foreign loans - Latin America [member] | Foreign [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 395 371
Stage 1 [Member] | Financial guarantee contracts [member] | Stage 3 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 4,271 R$ 5,620
Percentage of loan operations and lease operations portfolio 9.50% 10.90%
Stage 1 [Member] | Financial guarantee contracts [member] | Stage 3 [Member] | Corporate [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 4,148 R$ 5,538
Stage 1 [Member] | Financial guarantee contracts [member] | Stage 3 [Member] | Small and medium businesses [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 94 54
Stage 1 [Member] | Financial guarantee contracts [member] | Stage 3 [Member] | Foreign loans - Latin America [member] | Foreign [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 29 28
Individuals [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 212,564 193,385
Individuals [member] | Vehicles [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 15,920 14,165
Individuals [member] | Personal loan [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 29,543 27,295
Individuals [member] | Payroll loans [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 46,878 44,716
Individuals [member] | Mortgages [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 41,968 39,796
Individuals [member] | Stage 1 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 395,715 359,130
Individuals [member] | Stage 1 [Member] | Vehicles [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 15,920 14,165
Individuals [member] | Stage 1 [Member] | Credit Cards [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 195,003 173,643
Individuals [member] | Stage 1 [Member] | Personal loan [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 95,915 86,794
Individuals [member] | Stage 1 [Member] | Payroll loans [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 46,878 44,716
Individuals [member] | Stage 1 [Member] | Mortgages [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 41,999 39,812
Individuals [member] | Stage 1 [Member] | Stage 1 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 353,168 321,913
Individuals [member] | Stage 1 [Member] | Stage 1 [Member] | Vehicles [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 14,353 12,550
Individuals [member] | Stage 1 [Member] | Stage 1 [Member] | Credit Cards [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 175,662 159,253
Individuals [member] | Stage 1 [Member] | Stage 1 [Member] | Personal loan [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 79,340 70,645
Individuals [member] | Stage 1 [Member] | Stage 1 [Member] | Payroll loans [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 44,156 42,115
Individuals [member] | Stage 1 [Member] | Stage 1 [Member] | Mortgages [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 39,657 37,350
Individuals [member] | Stage 1 [Member] | Stage 2 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 23,813 17,452
Individuals [member] | Stage 1 [Member] | Stage 2 [Member] | Vehicles [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 1,022 987
Individuals [member] | Stage 1 [Member] | Stage 2 [Member] | Credit Cards [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 14,208 9,380
Individuals [member] | Stage 1 [Member] | Stage 2 [Member] | Personal loan [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 5,491 4,173
Individuals [member] | Stage 1 [Member] | Stage 2 [Member] | Payroll loans [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 1,024 733
Individuals [member] | Stage 1 [Member] | Stage 2 [Member] | Mortgages [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 2,068 2,179
Individuals [member] | Stage 1 [Member] | Stage 3 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 18,734 19,765
Individuals [member] | Stage 1 [Member] | Stage 3 [Member] | Vehicles [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 545 628
Individuals [member] | Stage 1 [Member] | Stage 3 [Member] | Credit Cards [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 5,133 5,010
Individuals [member] | Stage 1 [Member] | Stage 3 [Member] | Personal loan [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 11,084 11,976
Individuals [member] | Stage 1 [Member] | Stage 3 [Member] | Payroll loans [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 1,698 1,868
Individuals [member] | Stage 1 [Member] | Stage 3 [Member] | Mortgages [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 274 283
Individuals [member] | Stage 1 [Member] | Loan Operations [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 212,564 193,385
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Vehicles [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 15,920 14,165
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Credit Cards [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 78,255 67,413
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Personal loan [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 29,543 27,295
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Payroll loans [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 46,878 44,716
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Mortgages [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 41,968 39,796
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Stage 1 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 177,488 161,364
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Stage 1 [Member] | Vehicles [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 14,353 12,550
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Stage 1 [Member] | Credit Cards [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 65,227 57,073
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Stage 1 [Member] | Personal loan [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 14,125 12,290
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Stage 1 [Member] | Payroll loans [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 44,156 42,115
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Stage 1 [Member] | Mortgages [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 39,627 37,336
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Stage 2 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 17,029 13,032
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Stage 2 [Member] | Vehicles [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 1,022 987
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Stage 2 [Member] | Credit Cards [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 8,489 6,027
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Stage 2 [Member] | Personal loan [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 4,427 3,108
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Stage 2 [Member] | Payroll loans [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 1,024 733
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Stage 2 [Member] | Mortgages [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 2,067 2,177
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Stage 3 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 18,047 18,989
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Stage 3 [Member] | Vehicles [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 545 628
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Stage 3 [Member] | Credit Cards [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 4,539 4,313
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Stage 3 [Member] | Personal loan [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 10,991 11,897
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Stage 3 [Member] | Payroll loans [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 1,698 1,868
Individuals [member] | Stage 1 [Member] | Loan Operations [Member] | Stage 3 [Member] | Mortgages [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 274 283
Individuals [member] | Stage 1 [Member] | Commitments To Be Released [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 182,137 164,729
Individuals [member] | Stage 1 [Member] | Commitments To Be Released [Member] | Credit Cards [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 116,748 106,230
Individuals [member] | Stage 1 [Member] | Commitments To Be Released [Member] | Personal loan [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 65,358 58,483
Individuals [member] | Stage 1 [Member] | Commitments To Be Released [Member] | Mortgages [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 31 16
Individuals [member] | Stage 1 [Member] | Commitments To Be Released [Member] | Stage 1 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 174,666 159,533
Individuals [member] | Stage 1 [Member] | Commitments To Be Released [Member] | Stage 1 [Member] | Credit Cards [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 110,435 102,180
Individuals [member] | Stage 1 [Member] | Commitments To Be Released [Member] | Stage 1 [Member] | Personal loan [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 64,201 57,339
Individuals [member] | Stage 1 [Member] | Commitments To Be Released [Member] | Stage 1 [Member] | Mortgages [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 30 14
Individuals [member] | Stage 1 [Member] | Commitments To Be Released [Member] | Stage 2 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 6,784 4,420
Individuals [member] | Stage 1 [Member] | Commitments To Be Released [Member] | Stage 2 [Member] | Credit Cards [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 5,719 3,353
Individuals [member] | Stage 1 [Member] | Commitments To Be Released [Member] | Stage 2 [Member] | Personal loan [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 1,064 1,065
Individuals [member] | Stage 1 [Member] | Commitments To Be Released [Member] | Stage 2 [Member] | Mortgages [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 1 2
Individuals [member] | Stage 1 [Member] | Commitments To Be Released [Member] | Stage 3 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 687 776
Individuals [member] | Stage 1 [Member] | Commitments To Be Released [Member] | Stage 3 [Member] | Credit Cards [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 594 697
Individuals [member] | Stage 1 [Member] | Commitments To Be Released [Member] | Stage 3 [Member] | Personal loan [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 93 79
Individuals [member] | Stage 1 [Member] | Financial Guarantees [Member] | Stage 1 [Member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 1,014 1,016
Individuals [member] | Stage 1 [Member] | Financial Guarantees [Member] | Stage 1 [Member] | Personal loan [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 1,014 1,016
Individuals [member] | Stage 1 [Member] | Financial guarantee contracts [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio 1,014 1,016
Individuals [member] | Stage 1 [Member] | Financial guarantee contracts [member] | Personal loan [member]    
Disclosure of Credit Quality [Line Items]    
Loan operations and lease operations portfolio R$ 1,014 R$ 1,016