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Risk management - Notional amounts of hedging instruments (Details) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
WIBOR | Maturity date beyond January 2025 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Percentage of notional amounts of hedging instruments |  | 71.00%
WIBOR | Maturity date beyond December 2024 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Percentage of notional amounts of hedging instruments | 29.00% |
USD LIBOR | Maturity date beyond June 2023 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Percentage of notional amounts of hedging instruments |  | 89.00%
US Dollar | USD LIBOR |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value |  | 28,316,000,000
Polish Zloty | WIBOR |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value | 89,338,000,000 | 57,774,000,000

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- Definition The nominal amount of a hedging instrument. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 23B -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_23B_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24A -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24A_d&doctype=Standard -URIDate 2023-03-23 + Details
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