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Investments in Associates and Joint Ventures - Summary of Main Investments (Detail) - BRL (R$) R$ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of investments in associates and joint ventures [Line Items] |  |  |  |
Equity in earnings | R$ 149,465 | R$ 150,466 | R$ 144,356 | R$ 132,384
Other comprehensive income | (138) | (326) | 653 |
Total comprehensive results | 27,675 | 25,313 | 23,878 |
Investments in Subsidiaries Associates and Joint Ventures [member] |  |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |  |
Investment | 15,097 | 12,019 |  |
Equity in earnings | 1,315 | 747 | 550 |
Other comprehensive income | 1 |  |  |
Total comprehensive results | 1,316 | 747 |  |
Investments in Subsidiaries Associates and Joint Ventures [member] | Associates [member] |  |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |  |
Investment | 14,870 | 11,802 |  |
Equity in earnings | 1,380 | 798 | 578 |
Other comprehensive income | 1 |  |  |
Total comprehensive results | 1,381 | 798 |  |
Investments in Subsidiaries Associates and Joint Ventures [member] | Joint ventures [member] |  |  |  |
Disclosure of investments in associates and joint ventures [Line Items] |  |  |  |
Investment | 227 | 217 |  |
Equity in earnings | (65) | (51) | R$ (28) |
Total comprehensive results | R$ (65) | R$ (51) |  |

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