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Financial instruments - Risk Rating (Details) - Credit risk [member] - BRL (R$) R$ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Derivative financial instruments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures | R$ 3,887,100 | R$ 4,199,982
Derivative financial instruments | AAA |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures | 232,908 | 878,241
Derivative financial instruments | AA- |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures | 286,906 | 1,007,537
Derivative financial instruments | A+ |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures | 148,029 | 136,864
Derivative financial instruments | A Member |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures |  | 55,547
Derivative financial instruments | brAAA |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures | 2,747,948 | 1,682,513
Derivative financial instruments | brAA+ |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures |  | 439,280
Derivative financial instruments | brBB- member |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures | 156,450 |
Derivative financial instruments | Other risk ratings |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures | 314,859 |
Cash and cash equivalents and marketable securities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures | 22,382,329 | 21,613,157
Cash and cash equivalents and marketable securities | brAAA |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures | 20,830,651 | 20,856,072
Cash and cash equivalents and marketable securities | brAA+ |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures | 658,880 | 511,589
Cash and cash equivalents and marketable securities | brAA member |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures | 755 | 6,565
Cash and cash equivalents and marketable securities | brAA- memberr |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures | 19 | 2,169
Cash and cash equivalents and marketable securities | brA |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures | 31,504 |
Cash and cash equivalents and marketable securities | brBBB- |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures | 3 | 3
Cash and cash equivalents and marketable securities | brBB |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures | 710 | 1,132
Cash and cash equivalents and marketable securities | brBB- member |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures | 750,359 | 385
Cash and cash equivalents and marketable securities | Other risk ratings |  |
Disclosure of detailed information about financial instruments [line items] |  |
Rated Credit Exposures | R$ 109,448 | R$ 235,242

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