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Derivatives - Schedule of Composition of Derivative Financial Instruments Portfolio (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Derivative assets [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 41,854 | R$ 23,466
% per maturity term | 100.00% | 100.00%
Derivative assets [Member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 165 | R$ 492
% per maturity term | 0.40% | 2.10%
Derivative assets [Member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 6,998 | R$ 3,987
% per maturity term | 16.70% | 17.00%
Derivative assets [Member] | 0-30 days [Member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 4 | R$ 209
Derivative assets [Member] | 31-90 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 5,720 | R$ 2,289
% per maturity term | 13.70% | 9.80%
Derivative assets [Member] | 31-90 days [Member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value |  | R$ 10
Derivative assets [Member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 2,194 | R$ 1,782
% per maturity term | 5.20% | 7.60%
Derivative assets [Member] | 91-180 days [Member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value |  | R$ 2
Derivative assets [Member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 3,045 | R$ 2,313
% per maturity term | 7.30% | 9.90%
Derivative assets [Member] | 181-365 days [Member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value |  | R$ 2
Derivative assets [Member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 5,355 | R$ 4,069
% per maturity term | 12.80% | 17.30%
Derivative assets [Member] | 366-720 days [Member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 6 | R$ 13
Derivative assets [Member] | Over 720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 18,542 | R$ 9,026
% per maturity term | 44.30% | 38.40%
Derivative assets [Member] | Over 720 days [Member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 155 | R$ 256
Derivative assets [Member] | Swap [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 26,458 | R$ 13,093
% per maturity term | 63.20% | 55.80%
Derivative assets [Member] | Swap [member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 107 | R$ 705
Derivative assets [Member] | Swap [member] | 31-90 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 1,807 | 187
Derivative assets [Member] | Swap [member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 564 | 252
Derivative assets [Member] | Swap [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 1,668 | 700
Derivative assets [Member] | Swap [member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 4,464 | 2,894
Derivative assets [Member] | Swap [member] | Over 720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 17,848 | 8,355
Derivative assets [Member] | Optimum premiums [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 8,456 | R$ 4,215
% per maturity term | 20.20% | 18.00%
Derivative assets [Member] | Optimum premiums [member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 4,696 | R$ 1,167
Derivative assets [Member] | Optimum premiums [member] | 31-90 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 1,963 | 408
Derivative assets [Member] | Optimum premiums [member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 354 | 610
Derivative assets [Member] | Optimum premiums [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 726 | 872
Derivative assets [Member] | Optimum premiums [member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 500 | 975
Derivative assets [Member] | Optimum premiums [member] | Over 720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 217 | 183
Derivative assets [Member] | Forward [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 2,162 | R$ 1,835
% per maturity term | 5.20% | 7.80%
Derivative assets [Member] | Forward [member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 940 | R$ 893
Derivative assets [Member] | Forward [member] | 31-90 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 636 | 716
Derivative assets [Member] | Forward [member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 484 | 145
Derivative assets [Member] | Forward [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 87 | 81
Derivative assets [Member] | Credit derivatives financial institutions [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 167 | R$ 120
% per maturity term | 0.40% | 0.50%
Derivative assets [Member] | Credit derivatives financial institutions [member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 5 | R$ 1
Derivative assets [Member] | Credit derivatives financial institutions [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 3 | 5
Derivative assets [Member] | Credit derivatives financial institutions [member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 23 | 9
Derivative assets [Member] | Credit derivatives financial institutions [member] | Over 720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 136 | 105
Derivative assets [Member] | Non deliverable forward [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 4,446 | R$ 3,711
% per maturity term | 10.60% | 15.80%
Derivative assets [Member] | Non deliverable forward [member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 1,251 | R$ 1,013
Derivative assets [Member] | Non deliverable forward [member] | 31-90 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 1,314 | 968
Derivative assets [Member] | Non deliverable forward [member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 787 | 772
Derivative assets [Member] | Non deliverable forward [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 561 | 653
Derivative assets [Member] | Non deliverable forward [member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 347 | 178
Derivative assets [Member] | Non deliverable forward [member] | Over 720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 186 | 127
Derivative assets [Member] | Forward [member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 15 |
Derivative liabilities [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (47,828) | R$ (27,519)
% per maturity term | 100.00% | 100.00%
Derivative liabilities [member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (75) | R$ (80)
% per maturity term | 0.20% | 0.30%
Derivative liabilities [member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (6,653) | R$ (3,168)
% per maturity term | 13.90% | 11.50%
Derivative liabilities [member] | 0-30 days [Member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (15) | R$ (2)
Derivative liabilities [member] | 31-90 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (7,160) | R$ (2,253)
% per maturity term | 15.00% | 8.20%
Derivative liabilities [member] | 31-90 days [Member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (1) | R$ (2)
Derivative liabilities [member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (1,940) | R$ (1,817)
% per maturity term | 4.10% | 6.60%
Derivative liabilities [member] | 91-180 days [Member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (2) | R$ (8)
Derivative liabilities [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (3,096) | R$ (2,815)
% per maturity term | 6.50% | 10.20%
Derivative liabilities [member] | 181-365 days [Member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (4) | R$ (13)
Derivative liabilities [member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (9,458) | R$ (5,672)
% per maturity term | 19.70% | 20.60%
Derivative liabilities [member] | 366-720 days [Member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (9) | R$ (8)
Derivative liabilities [member] | Over 720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (19,521) | R$ (11,794)
% per maturity term | 40.80% | 42.90%
Derivative liabilities [member] | Over 720 days [Member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (44) | R$ (47)
Derivative liabilities [member] | Swaps [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (32,927) | R$ (19,516)
% per maturity term | 68.80% | 70.90%
Derivative liabilities [member] | Swaps [Member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (326) | R$ (923)
Derivative liabilities [member] | Swaps [Member] | 31-90 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (2,557) | (979)
Derivative liabilities [member] | Swaps [Member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (898) | (622)
Derivative liabilities [member] | Swaps [Member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (1,763) | (1,417)
Derivative liabilities [member] | Swaps [Member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (8,349) | (4,687)
Derivative liabilities [member] | Swaps [Member] | Over 720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (19,034) | (10,888)
Derivative liabilities [member] | Optimum premiums [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (9,061) | R$ (3,929)
% per maturity term | 18.90% | 14.30%
Derivative liabilities [member] | Optimum premiums [member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (3,668) | R$ (883)
Derivative liabilities [member] | Optimum premiums [member] | 31-90 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (3,494) | (500)
Derivative liabilities [member] | Optimum premiums [member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (383) | (604)
Derivative liabilities [member] | Optimum premiums [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (690) | (831)
Derivative liabilities [member] | Optimum premiums [member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (571) | (823)
Derivative liabilities [member] | Optimum premiums [member] | Over 720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (255) | (288)
Derivative liabilities [member] | Forward [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (754) | R$ (470)
% per maturity term | 1.60% | 1.70%
Derivative liabilities [member] | Forward [member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (753) | R$ (470)
Derivative liabilities [member] | Forward [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (1) |
Derivative liabilities [member] | Credit derivatives financial institutions [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (40) | R$ (140)
% per maturity term | 0.10% | 0.50%
Derivative liabilities [member] | Credit derivatives financial institutions [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (1) | R$ (2)
Derivative liabilities [member] | Credit derivatives financial institutions [member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (3) | (4)
Derivative liabilities [member] | Credit derivatives financial institutions [member] | Over 720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (36) | (134)
Derivative liabilities [member] | Non deliverable forward [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (4,971) | R$ (3,384)
% per maturity term | 10.40% | 12.30%
Derivative liabilities [member] | Non deliverable forward [member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (1,891) | R$ (890)
Derivative liabilities [member] | Non deliverable forward [member] | 31-90 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (1,108) | (772)
Derivative liabilities [member] | Non deliverable forward [member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (657) | (583)
Derivative liabilities [member] | Non deliverable forward [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (637) | (552)
Derivative liabilities [member] | Non deliverable forward [member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (526) | (150)
Derivative liabilities [member] | Non deliverable forward [member] | Over 720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (152) | R$ (437)

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