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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, 2018 | Dec. 31, 2017
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | R$ (52,149) |
Fair value, Beginning balance | 77 | R$ 73
Fair value, Ending balance | 49,323 | 52,149
Fair value, Ending balance | 286,646 | 273,536
Fair value, Beginning balance | 22,843 |
Fair value, Ending balance | 23,466 | 22,843
Fair value, Beginning balance | 26,746 |
Fair value, Ending balance | (27,519) | (26,746)
Brazilian government securities [member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | (32,926) |
Fair value, Ending balance | 27,839 | 32,926
Fair value, Ending balance | 217,058 | 207,844
Corporate securities [member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | (2,681) |
Fair value, Ending balance | 2,712 | 2,681
Fair value, Ending balance | 38,448 | 33,641
Corporate securities [member] | Shares [Member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | (148) |
Fair value, Ending balance | 161 | 148
Fair value, Ending balance | 9,446 | 5,959
Corporate securities [member] | Securitized real estate loans [Member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Ending balance | 1,411 | 1,795
Corporate securities [member] | Debentures [member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | (1) |
Fair value, Ending balance | 2 | 1
Fair value, Ending balance | 4,960 | 3,216
Corporate securities [member] | Eurobonds and others [member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | (1,847) |
Fair value, Ending balance | 1,496 | 1,847
Fair value, Ending balance | 1,396 | 688
Corporate securities [member] | Other [Member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Ending balance | 107 | 87
Corporate securities [member] | Financial credit bills [member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Ending balance | 19,724 | 21,170
Level 3 [Member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | 3,947 |
Fair value, Beginning balance |  | 227
Fair value, Beginning balance |  | 3,808
Total gains or losses (realized / unrealized), Recognized in the result |  | 0
Total gains or losses (realized / unrealized), Recognized in the result |  | (232)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0
Purchases |  | 200
Purchases |  | 578
Settlements |  | (427)
Settlements |  | (146)
Transfers in and / or out of Level |  | 0
Transfers in and / or out of Level |  | (61)
Fair value, Ending balance |  | 3,947
Total gains or losses (realized / unrealized),Recognized in the result | (377) | (412)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income | 0 | 0
Purchases | 90 |
Settlements | (353) |
Transfers in and / or out of Level | (474) |
Fair value, Ending balance | 2,833 | 3,947
Total Gains or Losses (Unrealized) | (618) |
Fair value, Beginning balance | 436 | 521
Total gains or losses (realized / unrealized), Recognized in the result | (3) | (33)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 101
Purchases | 205 |
Settlements | (254) | (244)
Transfers in and / or out of Level | (242) | 91
Fair value, Ending balance | 142 | 436
Total Gains or Losses (Unrealized) | 61 | 17
Fair value, Beginning balance | 103 | (60)
Total gains or losses (realized / unrealized), Recognized in the result | 40 | 117
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | (15)
Purchases | (148) |
Settlements | (141) | 111
Transfers in and / or out of Level | 44 | 22
Fair value, Ending balance | (26) | (103)
Total Gains or Losses (Unrealized) | 6 | (57)
Level 3 [Member] | Swap [member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | 369 | 468
Total gains or losses (realized / unrealized), Recognized in the result | (5) | (41)
Settlements | (30) | (100)
Transfers in and / or out of Level | (244) | 42
Fair value, Ending balance | 90 | 369
Total Gains or Losses (Unrealized) | 61 | 32
Fair value, Beginning balance | 102 | (56)
Total gains or losses (realized / unrealized), Recognized in the result | (37) | 122
Settlements | (92) | 97
Transfers in and / or out of Level | 44 | 21
Fair value, Ending balance | (3) | (102)
Total Gains or Losses (Unrealized) | (3) | (60)
Level 3 [Member] | Other derivative financial instruments [Member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | 1 | 6
Total gains or losses (realized / unrealized), Recognized in the result |  | (4)
Settlements | (1) | (1)
Fair value, Ending balance |  | 1
Total Gains or Losses (Unrealized) |  | (1)
Fair value, Beginning balance | 1 |
Total gains or losses (realized / unrealized), Recognized in the result | 77 |
Purchases | (148) |
Settlements | (49) |
Fair value, Ending balance | (23) | (1)
Total Gains or Losses (Unrealized) | 9 |
Level 3 [Member] | Options [Member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | 66 | 47
Total gains or losses (realized / unrealized), Recognized in the result | 2 | 12
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 101
Purchases | 205 |
Settlements | (223) | (143)
Transfers in and / or out of Level | 2 | 49
Fair value, Ending balance | 52 | 66
Total Gains or Losses (Unrealized) |  | (14)
Fair value, Beginning balance | 1 | (4)
Total gains or losses (realized / unrealized), Recognized in the result |  | (5)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | (15)
Settlements |  | 13
Fair value, Ending balance |  | (1)
Total Gains or Losses (Unrealized) |  | 3
Level 3 [Member] | Credit derivatives financial institutions [member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Settlements |  | 1
Transfers in and / or out of Level |  | 1
Level 3 [Member] | Brazilian government securities [member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | 1 |
Fair value, Beginning balance |  | 1
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0
Fair value, Ending balance |  | 1
Total gains or losses (realized / unrealized),Recognized in the result | (1) | (1)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income | 0 |
Fair value, Ending balance |  | 1
Level 3 [Member] | Corporate securities [member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | 3,946 |
Fair value, Beginning balance |  | 227
Fair value, Beginning balance |  | 3,807
Total gains or losses (realized / unrealized), Recognized in the result |  | 0
Total gains or losses (realized / unrealized), Recognized in the result |  | (232)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0
Purchases |  | 200
Purchases |  | 578
Settlements |  | (427)
Settlements |  | (146)
Transfers in and / or out of Level |  | 0
Transfers in and / or out of Level |  | (61)
Fair value, Ending balance | 2,833 | 3,946
Total gains or losses (realized / unrealized),Recognized in the result | (376) | (411)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income | 0 | 0
Purchases | 90 |
Settlements | (353) |
Transfers in and / or out of Level | (474) |
Fair value, Ending balance | 2,833 | 3,946
Total Gains or Losses (Unrealized) | (618) |
Level 3 [Member] | Corporate securities [member] | Shares [Member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | 2,019 |
Fair value, Beginning balance |  | 1,662
Total gains or losses (realized / unrealized), Recognized in the result |  | 122
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0
Purchases |  | 400
Transfers in and / or out of Level |  | (165)
Fair value, Ending balance | 1,268 | 2,019
Total gains or losses (realized / unrealized),Recognized in the result | 34 | (274)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income | 0 |
Settlements | (203) |
Transfers in and / or out of Level | (582) |
Fair value, Ending balance | 1,268 | 2,019
Total Gains or Losses (Unrealized) | (442) |
Level 3 [Member] | Corporate securities [member] | Securitized real estate loans [Member] |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |
Fair value, Beginning balance | 1,795 |
Fair value, Beginning balance |  | 6
Fair value, Beginning balance |  | 2,092
Total gains or losses (realized / unrealized), Recognized in the result |  | 0
Total gains or losses (realized / unrealized), Recognized in the result |  | (355)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0
Purchases |  | 58
Settlements |  | (6)
Transfers in and / or out of Level |  | 0
Fair value, Ending balance | 1,411 | 1,795
Total gains or losses (realized / unrealized),Recognized in the result | (359) | 16
Total gains or losses (realized / unrealized), Recognized in other comprehensive income | 0 | 0
Purchases | 57 |
Settlements | (89) |
Transfers in and / or out of Level | 7 |
Fair value, Ending balance | 1,411 | 1,795
Total Gains or Losses (Unrealized) | 19 |
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 | 122 |
Fair value, Beginning balance |  | 37
Total gains or losses (realized / unrealized), Recognized in the result |  | (1)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0
Purchases |  | 106
Settlements |  | (124)
Transfers in and / or out of Level |  | 104
Fair value, Ending balance | 85 | 122
Total gains or losses (realized / unrealized),Recognized in the result | (41) | (153)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income | 0 |
Settlements | (53) |
Transfers in and / or out of Level | 57 |
Fair value, Ending balance | 85 | 122
Total Gains or Losses (Unrealized) | (196) |
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 |  | 221
Total gains or losses (realized / unrealized), Recognized in the result |  | 0
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0
Purchases |  | 200
Purchases |  | 9
Settlements |  | (421)
Settlements |  | (9)
Transfers in and / or out of Level |  | 0
Fair value, Ending balance | 31 |
Total gains or losses (realized / unrealized),Recognized in the result | 2 |
Total gains or losses (realized / unrealized), Recognized in other comprehensive income | 0 | 0
Purchases | 20 |
Settlements | (2) |
Transfers in and / or out of Level | 11 |
Fair value, Ending balance | 31 |
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 | 10 |
Fair value, Beginning balance |  | 16
Total gains or losses (realized / unrealized), Recognized in the result |  | 2
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0
Purchases |  | 5
Settlements |  | (13)
Fair value, Ending balance | 33 | 10
Total gains or losses (realized / unrealized),Recognized in the result | (12) |
Total gains or losses (realized / unrealized), Recognized in other comprehensive income | 0 |
Purchases | 13 |
Settlements | (6) |
Transfers in and / or out of Level | 28 |
Fair value, Ending balance | 33 | R$ 10
Total Gains or Losses (Unrealized) | 1 |
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, Ending balance | 5 |
Total gains or losses (realized / unrealized), Recognized in other comprehensive income | 0 |
Transfers in and / or out of Level | 5 |
Fair value, Ending balance | R$ 5 |

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