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Derivatives - Schedule of Composition of Derivative Financial Instruments Portfolio (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Derivative assets [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 69,045 | R$ 76,504
% 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$ 483 | R$ 230
% per maturity term | 0.70% | 0.30%
Derivative assets [Member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 15,492 | R$ 17,634
% per maturity term | 22.40% | 23.00%
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$ 285 | R$ 56
Derivative assets [Member] | 31-90 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 6,261 | R$ 5,553
% per maturity term | 9.10% | 7.30%
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$ 2 | R$ 1
Derivative assets [Member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 6,031 | R$ 2,850
% per maturity term | 8.70% | 3.70%
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$ 0 | R$ 6
Derivative assets [Member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 5,632 | R$ 9,099
% per maturity term | 8.20% | 11.90%
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$ 6 | R$ 1
Derivative assets [Member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 8,826 | R$ 6,478
% per maturity term | 12.80% | 8.50%
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$ 25 | R$ 12
Derivative assets [Member] | Over 720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 26,803 | R$ 34,890
% per maturity term | 38.80% | 45.60%
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$ 165 | R$ 154
Derivative assets [Member] | Swap [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 38,014 | R$ 46,019
% per maturity term | 55.00% | 60.20%
Derivative assets [Member] | Swap [member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 1,820 | R$ 4,064
Derivative assets [Member] | Swap [member] | 31-90 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 370 | 515
Derivative assets [Member] | Swap [member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 837 | 629
Derivative assets [Member] | Swap [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 2,596 | 1,808
Derivative assets [Member] | Swap [member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 7,341 | 5,117
Derivative assets [Member] | Swap [member] | Over 720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 25,050 | 33,886
Derivative assets [Member] | Option agreements [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 21,252 | R$ 20,418
% per maturity term | 30.80% | 26.70%
Derivative assets [Member] | Option agreements [member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 10,599 | R$ 10,103
Derivative assets [Member] | Option agreements [member] | 31-90 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 3,515 | 2,325
Derivative assets [Member] | Option agreements [member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 3,788 | 523
Derivative assets [Member] | Option agreements [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 1,913 | 5,935
Derivative assets [Member] | Option agreements [member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 683 | 992
Derivative assets [Member] | Option agreements [member] | Over 720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 754 | 540
Derivative assets [Member] | Forward [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 3,111 | R$ 2,085
% per maturity term | 4.50% | 2.70%
Derivative assets [Member] | Forward [member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 1,595 | R$ 1,323
Derivative assets [Member] | Forward [member] | 31-90 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 1,167 | 367
Derivative assets [Member] | Forward [member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 290 | 297
Derivative assets [Member] | Forward [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 56 | 93
Derivative assets [Member] | Credit derivatives [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 242 | R$ 156
% per maturity term | 0.40% | 0.20%
Derivative assets [Member] | Credit derivatives [Member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 7 | R$ 8
Derivative assets [Member] | Credit derivatives [Member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 8 | 7
Derivative assets [Member] | Credit derivatives [Member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 22 | 29
Derivative assets [Member] | Credit derivatives [Member] | Over 720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 205 | 112
Derivative assets [Member] | Non deliverable forward [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 5,943 | R$ 7,596
% per maturity term | 8.60% | 9.90%
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$ 1,193 | R$ 2,088
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 | 1,207 | 2,345
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 | 1,109 | 1,387
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 | 1,053 | 1,255
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 | 752 | 323
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 | 629 | 198
Derivative assets [Member] | Forward [member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 3 | 5
Derivative liabilities [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (63,204) | R$ (79,505)
% 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$ (155) | R$ (47)
% per maturity term | 0.20% | 0.10%
Derivative liabilities [member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (7,153) | R$ (16,791)
% per maturity term | 11.30% | 21.10%
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$ (4) |
Derivative liabilities [member] | 31-90 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (7,066) | R$ (4,290)
% per maturity term | 11.20% | 5.40%
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$ (2) | R$ (1)
Derivative liabilities [member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (9,108) | R$ (2,712)
% per maturity term | 14.40% | 3.40%
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$ (6) | R$ (10)
Derivative liabilities [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (7,625) | R$ (12,672)
% per maturity term | 12.10% | 15.90%
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$ (5) | R$ (1)
Derivative liabilities [member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (8,596) | R$ (6,895)
% per maturity term | 13.60% | 8.70%
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$ (36) | R$ (14)
Derivative liabilities [member] | Over 720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (23,656) | R$ (36,145)
% per maturity term | 37.40% | 45.50%
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$ (102) | R$ (21)
Derivative liabilities [member] | Swaps [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (34,646) | R$ (51,789)
% per maturity term | 54.90% | 65.10%
Derivative liabilities [member] | Swaps [Member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (1,562) | R$ (7,344)
Derivative liabilities [member] | Swaps [Member] | 31-90 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (638) | (651)
Derivative liabilities [member] | Swaps [Member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (1,057) | (1,135)
Derivative liabilities [member] | Swaps [Member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (2,275) | (1,826)
Derivative liabilities [member] | Swaps [Member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (6,944) | (5,573)
Derivative liabilities [member] | Swaps [Member] | Over 720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (22,170) | (35,260)
Derivative liabilities [member] | Option agreements [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (22,547) | R$ (20,262)
% per maturity term | 35.70% | 25.50%
Derivative liabilities [member] | Option agreements [member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (4,086) | R$ (6,355)
Derivative liabilities [member] | Option agreements [member] | 31-90 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (5,170) | (1,969)
Derivative liabilities [member] | Option agreements [member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (7,479) | (543)
Derivative liabilities [member] | Option agreements [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (4,247) | (9,869)
Derivative liabilities [member] | Option agreements [member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (786) | (998)
Derivative liabilities [member] | Option agreements [member] | Over 720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (779) | (528)
Derivative liabilities [member] | Forward [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (762) | R$ (905)
% per maturity term | 1.20% | 1.10%
Derivative liabilities [member] | Forward [member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (762) | R$ (892)
Derivative liabilities [member] | Forward [member] | 91-180 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | 0 | (11)
Derivative liabilities [member] | Forward [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | 0 | (2)
Derivative liabilities [member] | Credit derivatives [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (198) | R$ (76)
% per maturity term | 0.30% | 0.10%
Derivative liabilities [member] | Credit derivatives [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 [Member] | 366-720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (8) | (9)
Derivative liabilities [member] | Credit derivatives [Member] | Over 720 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (188) | (65)
Derivative liabilities [member] | Non deliverable forward [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (4,896) | R$ (6,426)
% per maturity term | 7.70% | 8.10%
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$ (739) | R$ (2,200)
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 | (1,256) | (1,669)
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 | (565) | (1,013)
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 | (1,097) | (972)
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 | (822) | (301)
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$ (417) | R$ (271)

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