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Derivatives - Schedule of Composition of Derivative Financial Instruments Portfolio (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Derivative assets [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 23,466 | R$ 22,843
% per maturity term | 100.00% | 100.00%
Derivative assets [Member] | Check of swap companies [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 44 | R$ 68
% per maturity term | 0.20% | 0.30%
Derivative assets [Member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 492 | R$ 92
% per maturity term | 2.10% | 0.40%
Derivative assets [Member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 3,987 | R$ 7,978
% per maturity term | 17.00% | 34.90%
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$ 209 |
Derivative assets [Member] | Later than one month and not later than three months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 2,289 | R$ 1,648
% per maturity term | 9.80% | 7.20%
Derivative assets [Member] | Later than one month and not later than three months [member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 10 |
Derivative assets [Member] | Later than three months and not later than six months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 1,782 | R$ 1,355
% per maturity term | 7.60% | 5.90%
Derivative assets [Member] | Later than three months and not later than six months [member] | Check of swap companies [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 7 | R$ 6
Derivative assets [Member] | Later than three months and not later than six months [member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 2 |
Derivative assets [Member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 2,313 | R$ 2,360
% per maturity term | 9.90% | 10.30%
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 | R$ 3
Derivative assets [Member] | Later than one year and not later than two years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 4,069 | R$ 2,756
% per maturity term | 17.30% | 12.10%
Derivative assets [Member] | Later than one year and not later than two years [member] | Check of swap companies [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 13 |
Derivative assets [Member] | Later than one year and not later than two years [member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 13 | R$ 5
Derivative assets [Member] | Later than Two Years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 9,026 | R$ 6,746
% per maturity term | 38.40% | 29.60%
Derivative assets [Member] | Later than Two Years [member] | Check of swap companies [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 24 | R$ 62
Derivative assets [Member] | Later than Two Years [member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 256 | 84
Derivative assets [Member] | Swap [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 13,049 | R$ 9,190
% per maturity term | 55.60% | 40.20%
Derivative assets [Member] | Swap [member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 705 | R$ 189
Derivative assets [Member] | Swap [member] | Later than one month and not later than three months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 187 | 187
Derivative assets [Member] | Swap [member] | Later than three months and not later than six months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 245 | 327
Derivative assets [Member] | Swap [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 700 | 744
Derivative assets [Member] | Swap [member] | Later than one year and not later than two years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 2,881 | 1,661
Derivative assets [Member] | Swap [member] | Later than Two Years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 8,331 | 6,082
Derivative assets [Member] | Optimum premiums [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 4,215 | R$ 3,337
% per maturity term | 18.00% | 14.60%
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$ 1,167 | R$ 430
Derivative assets [Member] | Optimum premiums [member] | Later than one month and not later than three months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 408 | 440
Derivative assets [Member] | Optimum premiums [member] | Later than three months and not later than six months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 610 | 353
Derivative assets [Member] | Optimum premiums [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 872 | 955
Derivative assets [Member] | Optimum premiums [member] | Later than one year and not later than two years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 975 | 865
Derivative assets [Member] | Optimum premiums [member] | Later than Two Years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 183 | 294
Derivative assets [Member] | Forward [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 1,835 | R$ 6,911
% per maturity term | 7.80% | 30.30%
Derivative assets [Member] | Forward [member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 893 | R$ 6,529
Derivative assets [Member] | Forward [member] | Later than one month and not later than three months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 716 | 293
Derivative assets [Member] | Forward [member] | Later than three months and not later than six months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 145 | 46
Derivative assets [Member] | Forward [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 81 | 43
Derivative assets [Member] | Credit derivatives financial institutions [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 120 | R$ 137
% per maturity term | 0.50% | 0.60%
Derivative assets [Member] | Credit derivatives financial institutions [member] | Later than three months and not later than six months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 1 | 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 | 5 | 8
Derivative assets [Member] | Credit derivatives financial institutions [member] | Later than one year and not later than two years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 9 | 21
Derivative assets [Member] | Credit derivatives financial institutions [member] | Later than Two Years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 105 | 107
Derivative assets [Member] | Non deliverable forward [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | R$ 3,711 | R$ 2,950
% per maturity term | 15.80% | 12.90%
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$ 1,013 | R$ 677
Derivative assets [Member] | Non deliverable forward [member] | Later than one month and not later than three months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 968 | 717
Derivative assets [Member] | Non deliverable forward [member] | Later than three months and not later than six months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 772 | 624
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 | 653 | 610
Derivative assets [Member] | Non deliverable forward [member] | Later than one year and not later than two years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 178 | 166
Derivative assets [Member] | Non deliverable forward [member] | Later than Two Years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 127 | 156
Derivative assets [Member] | Futures [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value |  | R$ 158
% per maturity term |  | 0.70%
Derivative assets [Member] | Futures [Member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value |  | R$ 153
Derivative assets [Member] | Futures [Member] | Later than one month and not later than three months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value |  | 11
Derivative assets [Member] | Futures [Member] | Later than three months and not later than six months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value |  | (2)
Derivative assets [Member] | Futures [Member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value |  | (3)
Derivative assets [Member] | Futures [Member] | Later than one year and not later than two years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value |  | 38
Derivative assets [Member] | Futures [Member] | Later than Two Years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value |  | (39)
Derivative liabilities [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (27,519) | R$ (26,746)
% per maturity term | 100.00% | 100.00%
Derivative liabilities [member] | Check of swap companies [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value |  | R$ (122)
% per maturity term |  | 0.50%
Derivative liabilities [member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value |  | R$ (64)
% per maturity term |  | 0.20%
Derivative liabilities [member] | Check of swap companies [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (162) |
% per maturity term | 0.60% |
Derivative liabilities [member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (80) |
% per maturity term | 0.30% |
Derivative liabilities [member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (3,168) | R$ (7,596)
% per maturity term | 11.50% | 28.40%
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$ (2) |
Derivative liabilities [member] | Later than one month and not later than three months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (2,253) | R$ (1,113)
% per maturity term | 8.20% | 4.20%
Derivative liabilities [member] | Later than one month and not later than three months [member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value |  | R$ (2)
Derivative liabilities [member] | Later than one month and not later than three months [member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (2) |
Derivative liabilities [member] | Later than three months and not later than six months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (1,817) | R$ (1,378)
% per maturity term | 6.60% | 5.20%
Derivative liabilities [member] | Later than three months and not later than six months [member] | Check of swap companies [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value |  | R$ (73)
Derivative liabilities [member] | Later than three months and not later than six months [member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value |  | (2)
Derivative liabilities [member] | Later than three months and not later than six months [member] | Check of swap companies [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (16) |
Derivative liabilities [member] | Later than three months and not later than six months [member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (8) |
Derivative liabilities [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (2,815) | R$ (3,325)
% per maturity term | 10.20% | 12.40%
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$ (6)
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$ (13) |
Derivative liabilities [member] | Later than one year and not later than two years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (5,672) | R$ (4,877)
% per maturity term | 20.60% | 18.20%
Derivative liabilities [member] | Later than one year and not later than two years [member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value |  | R$ (9)
Derivative liabilities [member] | Later than one year and not later than two years [member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (8) |
Derivative liabilities [member] | Later than Two Years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (11,794) | R$ (8,457)
% per maturity term | 42.90% | 31.60%
Derivative liabilities [member] | Later than Two Years [member] | Check of swap companies [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value |  | R$ (49)
Derivative liabilities [member] | Later than Two Years [member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value |  | (45)
Derivative liabilities [member] | Later than Two Years [member] | Check of swap companies [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (146) |
Derivative liabilities [member] | Later than Two Years [member] | Swaps other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (47) |
Derivative liabilities [member] | Swaps [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (19,354) | R$ (13,692)
% per maturity term | 70.30% | 51.20%
Derivative liabilities [member] | Swaps [Member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (923) | R$ (65)
Derivative liabilities [member] | Swaps [Member] | Later than one month and not later than three months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (979) | (202)
Derivative liabilities [member] | Swaps [Member] | Later than three months and not later than six months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (606) | (451)
Derivative liabilities [member] | Swaps [Member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (1,417) | (1,711)
Derivative liabilities [member] | Swaps [Member] | Later than one year and not later than two years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (4,687) | (3,747)
Derivative liabilities [member] | Swaps [Member] | Later than Two Years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (10,742) | (7,516)
Derivative liabilities [member] | Optimum premiums [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (3,929) | R$ (2,793)
% per maturity term | 14.30% | 10.40%
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$ (883) | R$ (332)
Derivative liabilities [member] | Optimum premiums [member] | Later than one month and not later than three months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (500) | (174)
Derivative liabilities [member] | Optimum premiums [member] | Later than three months and not later than six months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (604) | (304)
Derivative liabilities [member] | Optimum premiums [member] | 181-365 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (831) | (821)
Derivative liabilities [member] | Optimum premiums [member] | Later than one year and not later than two years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (823) | (889)
Derivative liabilities [member] | Optimum premiums [member] | Later than Two Years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (288) | (273)
Derivative liabilities [member] | Forward [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (470) |
% per maturity term | 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$ (470) |
Derivative liabilities [member] | Credit derivatives financial institutions [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (140) | R$ (58)
% per maturity term | 0.50% | 0.20%
Derivative liabilities [member] | Credit derivatives financial institutions [member] | Later than three months and not later than six months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value |  | R$ (1)
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$ (2) | (2)
Derivative liabilities [member] | Credit derivatives financial institutions [member] | Later than one year and not later than two years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (4) | (7)
Derivative liabilities [member] | Credit derivatives financial institutions [member] | Later than Two Years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (134) | (48)
Derivative liabilities [member] | Non deliverable forward [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (3,384) | R$ (3,745)
% per maturity term | 12.30% | 14.00%
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$ (890) | R$ (927)
Derivative liabilities [member] | Non deliverable forward [member] | Later than one month and not later than three months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (772) | (735)
Derivative liabilities [member] | Non deliverable forward [member] | Later than three months and not later than six months [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (583) | (547)
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 | (552) | (785)
Derivative liabilities [member] | Non deliverable forward [member] | Later than one year and not later than two years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | (150) | (225)
Derivative liabilities [member] | Non deliverable forward [member] | Later than Two Years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | R$ (437) | (526)
Derivative liabilities [member] | Forwards [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value |  | R$ (6,272)
% per maturity term |  | 23.50%
Derivative liabilities [member] | Forwards [member] | 0-30 days [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value |  | R$ (6,272)

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