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Disclosures on equity - Financial Restrictions with Respect to Bonds Issued (Details) | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure Of Financial Restrictions [Line Items] |  |
Borrowing ratio, maximum | 1.0 |
Financial Restrictions | Net Financial Debt (NFD)/Equity | Quarterly | Series H bonds |  |
Disclosure Of Financial Restrictions [Line Items] |  |
Borrowing ratio, maximum | 0.0100 | 0.0100
Indicator or ratio determined by the company | 0.47% | 0.15%
Financial Restrictions | Net Financial Debt (NFD)/Equity | Quarterly | Series Q bonds |  |
Disclosure Of Financial Restrictions [Line Items] |  |
Borrowing ratio, maximum | 0.0100 | 0.0100
Indicator or ratio determined by the company | 0.47% | 0.15%
Financial Restrictions | Net Financial Debt (NFD)/Equity | Quarterly | Series O bonds |  |
Disclosure Of Financial Restrictions [Line Items] |  |
Borrowing ratio, maximum | 0.0100 | 0.0100
Indicator or ratio determined by the company | 0.47% | 0.15%
Financial Restrictions | Net Financial Debt (NFD)/Equity | Quarterly | Bank borrowings |  |
Disclosure Of Financial Restrictions [Line Items] |  |
Borrowing ratio, maximum | 0.0100 | 0.0100
Indicator or ratio determined by the company | 0.47% | 0.15%

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