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Fair Value of Financial Instruments - Summary of Changes in Balance Sheet for Financial Instruments Classified by Level 3 Fair Value Hierarchy (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | R$ 109,942 |
Fair value, Beginning balance | 1,629 | R$ 1,640
Fair value, Ending balance | 434,169 | 465,581
Fair value, Beginning balance | 76,504 |
Fair value, Ending balance | 69,045 | 76,504
Fair value, Beginning balance | (79,505) |
Fair value, Ending balance | (63,204) | (79,505)
Level 3 [Member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | 1,968 |
Fair value, Beginning balance |  | 34
Fair value, Beginning balance |  | 1,719
Total gains or losses (realized / unrealized), Recognized in the result |  | 5
Purchases |  | 1,619
Settlements |  | (779)
Transfers in and / or out of Level |  | 569
Fair value, Ending balance | 1,563 | 1,968
Total gains or losses (realized / unrealized),Recognized in the result | (505) | (1,160)
Purchases | 1,993 | 298
Settlements | (865) | (221)
Transfers in and / or out of Level | (1,028) | (116)
Fair value, Ending balance |  | 1,968
Total Gains or Losses (Unrealized) | (434) | (700)
Fair value, Beginning balance | 105 | 103
Total gains or losses (realized / unrealized), Recognized in the result | 46 | 89
Purchases | 327 | 193
Settlements | (284) | (234)
Transfers in and / or out of Level | (42) | (46)
Fair value, Ending balance | 152 | 105
Total Gains or Losses (Unrealized) | 56 | 51
Fair value, Beginning balance | (110) | (85)
Total gains or losses (realized / unrealized), Recognized in the result | 72 | (93)
Purchases | (233) | (130)
Settlements | 148 | 177
Transfers in and / or out of Level | (2) | 21
Fair value, Ending balance | (125) | (110)
Total Gains or Losses (Unrealized) | (24) | (90)
Level 3 [Member] | Swap [member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | 93 | 32
Total gains or losses (realized / unrealized), Recognized in the result | 26 | 107
Purchases | 56 | 10
Settlements | (43) | (11)
Transfers in and / or out of Level | (42) | (45)
Fair value, Ending balance | 90 | 93
Total Gains or Losses (Unrealized) | 90 | 91
Fair value, Beginning balance | (109) | (46)
Total gains or losses (realized / unrealized), Recognized in the result | 8 | (74)
Purchases | (30) | (12)
Settlements | 22 | 1
Transfers in and / or out of Level | (2) | 22
Fair value, Ending balance | (111) | (109)
Total Gains or Losses (Unrealized) | (46) | (90)
Level 3 [Member] | Options [Member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | 12 | 71
Total gains or losses (realized / unrealized), Recognized in the result | 20 | (18)
Purchases | 271 | 183
Settlements | (241) | (223)
Transfers in and / or out of Level |  | (1)
Fair value, Ending balance | 62 | 12
Total Gains or Losses (Unrealized) | (34) | (40)
Fair value, Beginning balance | (1) | (39)
Total gains or losses (realized / unrealized), Recognized in the result | 64 | (19)
Purchases | (203) | (118)
Settlements | 126 | 176
Transfers in and / or out of Level |  | (1)
Fair value, Ending balance | (14) | (1)
Total Gains or Losses (Unrealized) | 22 |
Level 3 [Member] | Corporate securities [member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | 1,968 |
Fair value, Beginning balance |  | 34
Fair value, Beginning balance |  | 1,719
Total gains or losses (realized / unrealized), Recognized in the result |  | 5
Purchases |  | 1,619
Settlements |  | (779)
Transfers in and / or out of Level |  | 569
Fair value, Ending balance | 1,563 | 1,968
Total gains or losses (realized / unrealized),Recognized in the result | (505) | (1,160)
Purchases | 1,993 | 298
Settlements | (865) | (221)
Transfers in and / or out of Level | (1,028) | (116)
Fair value, Ending balance |  | 1,968
Total Gains or Losses (Unrealized) | (434) | (700)
Level 3 [Member] | Corporate securities [member] | Real estate receivables certificates [member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | 548 |
Fair value, Beginning balance |  | 26
Fair value, Beginning balance |  | 1,444
Purchases |  | 263
Settlements |  | (433)
Fair value, Ending balance | 3 | 548
Total gains or losses (realized / unrealized),Recognized in the result | (167) | (726)
Purchases | 1,039 |
Settlements | (616) | (26)
Transfers in and / or out of Level | (801) |
Fair value, Ending balance |  | 548
Total Gains or Losses (Unrealized) |  | (14)
Level 3 [Member] | Corporate securities [member] | Debentures [member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | 1,350 |
Fair value, Beginning balance |  | 225
Total gains or losses (realized / unrealized), Recognized in the result |  | (2)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 6
Purchases |  | 1,050
Settlements |  | (272)
Transfers in and / or out of Level |  | 716
Fair value, Ending balance | 1,478 | 1,350
Total gains or losses (realized / unrealized),Recognized in the result | (313) | (369)
Purchases | 855 | 50
Settlements | (211) | (54)
Transfers in and / or out of Level | (203) |
Fair value, Ending balance |  | 1,350
Total Gains or Losses (Unrealized) | (432) | (635)
Level 3 [Member] | Corporate securities [member] | Eurobonds and others [member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance |  | 7
Fair value, Beginning balance |  | 8
Total gains or losses (realized / unrealized), Recognized in the result |  | 7
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | (6)
Purchases |  | 69
Settlements |  | (12)
Transfers in and / or out of Level |  | (58)
Fair value, Ending balance | 8 |
Total gains or losses (realized / unrealized),Recognized in the result | (9) | (6)
Purchases | 23 | 248
Settlements | (6) | (141)
Transfers in and / or out of Level |  | (116)
Total Gains or Losses (Unrealized) | (2) |
Level 3 [Member] | Corporate securities [member] | Other [Member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance |  | 30
Purchases |  | 10
Settlements |  | (38)
Total gains or losses (realized / unrealized),Recognized in the result |  | (2)
Level 3 [Member] | Corporate securities [member] | Financial credit bills [member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | 6 | 13
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | (2)
Settlements |  | (5)
Fair value, Ending balance |  | 6
Total gains or losses (realized / unrealized),Recognized in the result | (1) |
Purchases | 14 |
Transfers in and / or out of Level | (6) |
Fair value, Ending balance | 13 | 6
Level 3 [Member] | Corporate securities [member] | Rural product note [Member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | 64 |
Purchases | 62 |
Purchases |  | 227
Settlements | (32) |
Settlements |  | (19)
Transfers in and / or out of Level | (18) |
Transfers in and / or out of Level |  | (89)
Fair value, Ending balance | 61 | 64
Total gains or losses (realized / unrealized),Recognized in the result | R$ (15) | (55)
Fair value, Ending balance |  | 64
Total Gains or Losses (Unrealized) |  | R$ (51)

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