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Basis of Presentation of the Consolidated Financial Statements - Acquisition of mobile assets of Oi Group (Details) - Oi Group € in Millions, R$ in Millions | Oct. 23, 2023 EUR (€) | Oct. 23, 2023 BRL (R$) | Apr. 20, 2022 EUR (€) | Apr. 20, 2022 BRL (R$) | Dec. 31, 2022 EUR (€) | Apr. 20, 2022 BRL (R$)
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Disclosure of subsidiaries [line items] |  |  |  |  |  |
Cash transferred, estimation |  |  | € 1,063 | R$ 5,373 |  |
Total |  |  | € 972 |  |  | R$ 4,885
Increase in existing liabilities, contingent liabilities recognised in business combination, percentage |  |  | 0.10 | 0.10 |  |
Consideration |  | R$ 5,129 | € 1,093 |  |  | 5,492
Intangible assets | € |  |  | 539 |  |  |
Goodwill | € |  |  | 676 |  | € 676 |
Retained amount, percentage |  | 50.00% |  |  |  |
Cash transferred, retained amount | R$ |  | R$ 488 |  |  |  |
Withdrawn amount, percentage |  | 50.00% |  |  |  |
Withdrawn amount | € 51 | R$ 277 |  |  |  |
Licenses |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Intangible assets | € |  |  | € 520 |  | € 520 |
Committed payment subject to certain targets |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Liabilities incurred | R$ |  |  |  |  |  | 110
Other committed payment |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Liabilities incurred | R$ |  |  |  |  |  | R$ 8

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