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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
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |  |
Fair value, Beginning balance | R$ 83 | R$ 77 |
Fair value, Ending balance | 76,660 | 49,323 |
Fair value, Ending balance | 322,929 | 286,646 |
Total Gains or Losses (Unrealized) |  | 1 |
Fair value, Beginning balance | 23,466 |  |
Fair value, Ending balance | 41,854 | 23,466 |
Fair value, Beginning balance | (27,519) |  |
Fair value, Ending balance | (47,828) | (27,519) |
Gains (losses) on financial assets measured at fair value through other comprehensive income, net of tax | 628 | (254) | R$ (128)
Brazilian government securities [member] |  |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |  |
Fair value, Ending balance | 50,732 | 27,839 |
Fair value, Ending balance | 219,611 | 217,058 |
Level 3 [Member] |  |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |  |
Fair value, Beginning balance | 2,833 |  |
Fair value, Beginning balance |  | 3,947 |
Total gains or losses (realized / unrealized), Recognized in the result | 43 |  |
Total gains or losses (realized / unrealized), Recognized in other comprehensive income | (47) |  |
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0 |
Purchases | 76 |  |
Purchases |  | 90 |
Settlements | (68) |  |
Settlements |  | (353) |
Transfers in and / or out of Level | 30 | 0 |
Transfers in and / or out of Level |  | (474) |
Fair value, Ending balance | 34 |  |
Fair value, Ending balance |  | 2,833 |
Total gains or losses (realized / unrealized),Recognized in the result | (1,300) | (377) |
Purchases | 1,755 |  |
Settlements | (907) |  |
Transfers in and / or out of Level | (662) |  |
Fair value, Ending balance | 1,719 | 2,833 |
Total Gains or Losses (Unrealized) | (307) | (618) |
Fair value, Beginning balance | 142 | 436 |
Total gains or losses (realized / unrealized), Recognized in the result | (78) | (3) |
Purchases | 274 | 205 |
Settlements | (156) | (254) |
Transfers in and / or out of Level | (79) | (242) |
Fair value, Ending balance | 103 | 142 | 436
Total Gains or Losses (Unrealized) | (1) | 61 |
Fair value, Beginning balance | (26) | (103) |
Total gains or losses (realized / unrealized), Recognized in the result | (17) | 40 |
Purchases | (196) | (148) |
Settlements | 172 | 141 |
Transfers in and / or out of Level | (18) | 44 |
Fair value, Ending balance | (85) | (26) | (103)
Total Gains or Losses (Unrealized) | (2) | 6 |
Gains (losses) on financial assets measured at fair value through other comprehensive income, net of tax | (2) |  |
Level 3 [Member] | Debentures [member] |  |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |  |
Gains (losses) on financial assets measured at fair value through other comprehensive income, net of tax | 1 |  |
Level 3 [Member] | Eurobonds and others [member] |  |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |  |
Gains (losses) on financial assets measured at fair value through other comprehensive income, net of tax | (3) |  |
Level 3 [Member] | Swap [member] |  |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |  |
Fair value, Beginning balance | 90 | 369 |
Total gains or losses (realized / unrealized), Recognized in the result | 21 | (5) |
Purchases | 2 |  |
Settlements | (2) | (30) |
Transfers in and / or out of Level | (79) | (244) |
Fair value, Ending balance | 32 | 90 | 369
Total Gains or Losses (Unrealized) | 31 | 61 |
Fair value, Beginning balance | (3) | (102) |
Total gains or losses (realized / unrealized), Recognized in the result | (51) | (37) |
Purchases | (10) |  |
Settlements | 36 | 92 |
Transfers in and / or out of Level | (18) | 44 |
Fair value, Ending balance | (46) | (3) | (102)
Total Gains or Losses (Unrealized) | (17) | (3) |
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 |
Settlements |  | (1) |
Fair value, Ending balance |  |  | 1
Total gains or losses (realized / unrealized), Recognized in the result | 34 |  |
Purchases | (186) |  |
Settlements | 136 |  |
Fair value, Ending balance | (39) |  |
Total Gains or Losses (Unrealized) | 15 |  |
Level 3 [Member] | Options [Member] |  |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |  |
Fair value, Beginning balance | 52 | 66 |
Total gains or losses (realized / unrealized), Recognized in the result | (99) | 2 |
Purchases | 272 | 205 |
Settlements | (154) | (223) |
Transfers in and / or out of Level |  | 2 |
Fair value, Ending balance | 71 | 52 | 66
Total Gains or Losses (Unrealized) | (32) |  |
Fair value, Beginning balance | (23) | (1) |
Total gains or losses (realized / unrealized), Recognized in the result |  | 77 |
Purchases |  | (148) |
Settlements |  | 49 |
Fair value, Ending balance |  | (23) | R$ (1)
Total Gains or Losses (Unrealized) |  | 9 |
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, Ending balance | 0 |  |
Fair value, Ending balance | 0 |  |
Total gains or losses (realized / unrealized),Recognized in the result |  | (1) |
Level 3 [Member] | Corporate securities [member] |  |  |
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items] |  |  |
Fair value, Beginning balance | 2,833 |  |
Fair value, Beginning balance |  | 3,946 |
Total gains or losses (realized / unrealized), Recognized in the result | 43 |  |
Total gains or losses (realized / unrealized), Recognized in other comprehensive income | (47) | 0 |
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0 |
Purchases | 76 |  |
Purchases |  | 90 |
Settlements | (68) |  |
Settlements |  | (353) |
Transfers in and / or out of Level | 30 |  |
Transfers in and / or out of Level |  | (474) |
Fair value, Ending balance | 34 |  |
Fair value, Ending balance |  | 2,833 |
Total gains or losses (realized / unrealized),Recognized in the result | (1,300) | (376) |
Purchases | 1,755 |  |
Settlements | (907) |  |
Transfers in and / or out of Level | (662) |  |
Fair value, Ending balance | 1,719 | 2,833 |
Total Gains or Losses (Unrealized) | (307) | (618) |
Gains (losses) on financial assets measured at fair value through other comprehensive income, net of tax | (2) |  |
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 | 1,268 |  |
Fair value, Beginning balance |  | 2,019 |
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 |
Total gains or losses (realized / unrealized),Recognized in the result | (285) | 34 |
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0 |
Transfers in and / or out of Level | (983) |  |
Fair value, Ending balance | 0 | 1,268 |
Total Gains or Losses (Unrealized) |  | (442) |
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 | 1,411 |  |
Fair value, Beginning balance |  | 1,795 |
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0 |
Purchases | 26 |  |
Purchases |  | 57 |
Settlements |  | (89) |
Transfers in and / or out of Level |  | 7 |
Fair value, Ending balance | 26 |  |
Fair value, Ending balance |  | 1,411 |
Total gains or losses (realized / unrealized),Recognized in the result | (487) | (359) |
Total gains or losses (realized / unrealized), Recognized in other comprehensive income | 0 |  |
Purchases | 573 |  |
Settlements | (53) |  |
Fair value, Ending balance | 1,444 | 1,411 |
Total Gains or Losses (Unrealized) | 29 | 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 | 85 |  |
Fair value, Beginning balance |  | 122 |
Total gains or losses (realized / unrealized), Recognized in the result | (2) |  |
Total gains or losses (realized / unrealized), Recognized in other comprehensive income | 6 |  |
Total gains or losses (realized / unrealized), Recognized in other comprehensive income | 0 |  |
Purchases | 50 |  |
Settlements | (54) |  |
Settlements |  | (53) |
Transfers in and / or out of Level | 0 |  |
Transfers in and / or out of Level |  | 57 |
Fair value, Ending balance | 0 |  |
Fair value, Ending balance |  | 85 |
Total gains or losses (realized / unrealized),Recognized in the result | (504) | (41) |
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0 |
Purchases | 604 |  |
Settlements | (222) |  |
Transfers in and / or out of Level | 262 |  |
Fair value, Ending balance | 225 | 85 |
Total Gains or Losses (Unrealized) | (336) | (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 | 31 |  |
Total gains or losses (realized / unrealized), Recognized in the result | 45 |  |
Total gains or losses (realized / unrealized), Recognized in other comprehensive income | (53) |  |
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0 |
Purchases |  | 20 |
Settlements | (14) |  |
Settlements |  | (2) |
Transfers in and / or out of Level | 30 |  |
Transfers in and / or out of Level |  | 11 |
Fair value, Ending balance | 8 |  |
Fair value, Ending balance |  | 31 |
Total gains or losses (realized / unrealized),Recognized in the result | (4) | 2 |
Total gains or losses (realized / unrealized), Recognized in other comprehensive income | 0 |  |
Purchases | 3 |  |
Settlements | (51) |  |
Transfers in and / or out of Level | 28 |  |
Fair value, Ending balance | 7 | 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 | 33 |  |
Fair value, Beginning balance |  | 10 |
Purchases |  | 13 |
Settlements |  | (6) |
Transfers in and / or out of Level | 28 |  |
Fair value, Ending balance |  | 33 |
Total gains or losses (realized / unrealized),Recognized in the result | (26) | (12) |
Total gains or losses (realized / unrealized), Recognized in other comprehensive income |  | 0 |
Purchases | 567 |  |
Settlements | (575) |  |
Transfers in and / or out of Level | 31 |  |
Fair value, Ending balance | 30 | 33 |
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 | 5 |  |
Transfers in and / or out of Level |  | 5 |
Fair value, Ending balance |  | 5 |
Total gains or losses (realized / unrealized),Recognized in the result | 6 |  |
Total gains or losses (realized / unrealized), Recognized in other comprehensive income | 0 |  |
Purchases | 8 |  |
Settlements | (6) |  |
Fair value, Ending balance | R$ 13 | R$ 5 |

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