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Assets held for sale and liabilities directly associated with assets held for sale (Details) - EUR (€) | Dec. 31, 2023 | Dec. 31, 2022
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Assets held for sale and liabilities directly associated with assets held for sale |  |
Assets held for sale | € 2,609,000,000 | € 264,000,000
Liabilities held for sale | 1,862,000,000 | € 108,000,000
Assets and liabilities classified as held for sale [member] |  |
Assets held for sale and liabilities directly associated with assets held for sale |  |
Assets held for sale | 2,597 |
Liabilities held for sale | 1,862 |
Assets held for sale, current | 846 |
Liabilities held for sale, current | € 681 |

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