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Subsequent Events - Additional Information (Detail) $ in Millions | Apr. 30, 2020 BRL (R$) | Feb. 29, 2020 USD ($) | Jan. 31, 2020 BRL (R$) | Dec. 31, 2019 BRL (R$) | Oct. 31, 2019 BRL (R$) | Dec. 31, 2018 BRL (R$) | May 11, 2017 BRL (R$)
--- | --- | --- | --- | --- | --- | --- | ---
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Borrowings |  |  |  | R$ 85,271,000,000 |  | R$ 75,353,000,000 |
Consideration transferred |  |  |  |  |  |  | R$ 6,650,000,000
Notional amount |  |  |  | R$ 20,000,000 |  |  |
Zup IT Servios em Tecnologia e Inovao Ltda [Member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  | 100.00% |  |
Zup IT Servios em Tecnologia e Inovao Ltda [Member] | First Phase [Member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  | 52.96% |  |
Consideration transferred |  |  |  |  | R$ 293,000,000 |  |
Zup IT Servios em Tecnologia e Inovao Ltda [Member] | Second Phase [Member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  | 19.60% |  |
Nonadjusting Events [Member] | Senior Notes Maturing 2023 [Member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Borrowings |  |  | R$ 1,000,000,000 |  |  |  |
Borrowings interest rate |  |  | 2.90% |  |  |  |
Nonadjusting Events [Member] | Senior Notes Maturing 2025 [Member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Borrowings |  |  | R$ 500,000,000 |  |  |  |
Borrowings interest rate |  |  | 3.25% |  |  |  |
Covid Nineteen [Member] | Todos pela Sade [Member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Donations Received | R$ 1,000,000,000 |  |  |  |  |  |
Amount of donation allocated to different projects | R$ 250,000,000 |  |  |  |  |  |
Major Borrowings [Member] | Perpetual Subordinate Notes [Member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Notional amount | $ |  | $ 700 |  |  |  |  |
Borrowings Interest Rate Recalculation Period |  | 5 years |  |  |  |  |
Major Borrowings [Member] | Perpetual Subordinate Notes [Member] | Fixed interest rate [member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Borrowings interest rate |  | 4.625% |  |  |  |  |

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