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Derivative Financial Instruments and Risk Management Policies - Ineffective Portion of Accounting Hedges (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of detailed information about hedges [line items] |  |
Changes in fair value of the hedging instrument | € 695 | € (650)
Changes in the fair value of hedges item for the hedged risk | 694 | (636)
Ineffective portion hedged registered in the income statement | 1 | (14)
Interest rate risk |  |
Disclosure of detailed information about hedges [line items] |  |
Changes in fair value of the hedging instrument | (288) | 97
Changes in the fair value of hedges item for the hedged risk | (289) | 98
Ineffective portion hedged registered in the income statement | 1 | (1)
Interest rate risk | Cash flow hedges |  |
Disclosure of detailed information about hedges [line items] |  |
Changes in fair value of the hedging instrument | 23 | (39)
Changes in the fair value of hedges item for the hedged risk | 23 | (39)
Ineffective portion hedged registered in the income statement | 0 | 0
Interest rate risk | Fair value hedges |  |
Disclosure of detailed information about hedges [line items] |  |
Changes in fair value of the hedging instrument | (311) | 136
Changes in the fair value of hedges item for the hedged risk | (312) | 137
Ineffective portion hedged registered in the income statement | 1 | (1)
Exchange rate risk |  |
Disclosure of detailed information about hedges [line items] |  |
Changes in fair value of the hedging instrument | 804 | (702)
Changes in the fair value of hedges item for the hedged risk | 804 | (699)
Ineffective portion hedged registered in the income statement | 0 | (3)
Exchange rate risk | Cash flow hedges |  |
Disclosure of detailed information about hedges [line items] |  |
Changes in fair value of the hedging instrument | 539 | (409)
Changes in the fair value of hedges item for the hedged risk | 540 | (406)
Ineffective portion hedged registered in the income statement | (1) | (3)
Exchange rate risk | Fair value hedges |  |
Disclosure of detailed information about hedges [line items] |  |
Changes in fair value of the hedging instrument | 1 |
Changes in the fair value of hedges item for the hedged risk | 0 |
Ineffective portion hedged registered in the income statement | 1 |
Exchange rate risk | Net investment hedges |  |
Disclosure of detailed information about hedges [line items] |  |
Changes in fair value of the hedging instrument | 264 | (293)
Changes in the fair value of hedges item for the hedged risk | 264 | (293)
Ineffective portion hedged registered in the income statement | 0 | 0
Interest rate and exchange rate risk |  |
Disclosure of detailed information about hedges [line items] |  |
Changes in fair value of the hedging instrument | 179 | (45)
Changes in the fair value of hedges item for the hedged risk | 179 | (35)
Ineffective portion hedged registered in the income statement | 0 | (10)
Interest rate and exchange rate risk | Cash flow hedges |  |
Disclosure of detailed information about hedges [line items] |  |
Changes in fair value of the hedging instrument | 179 | (45)
Changes in the fair value of hedges item for the hedged risk | 179 | (35)
Ineffective portion hedged registered in the income statement | € 0 | € (10)

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The gain (loss) on the change in fair value of the hedging instrument used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24A -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24A_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Gain (loss) on change in fair value of hedging instrument + References No definition available. + Details
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