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Consolidated Shareholders' Equity - Summary of Movements within Other Comprehensive Income (Details) - EUR (€) € in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Disclosure of analysis of other comprehensive income by item [Line Items] |  |  |
Items not subsequently reclassifiable to profit or loss | € 85 | € 787 | € 451
Items subsequently reclassifiable to profit or loss | (1,058) | 3,463 | 2,313
Foreign exchange gain (loss) | (14) |  | 40
Euroapi |  |  |
Disclosure of analysis of other comprehensive income by item [Line Items] |  |  |
Foreign exchange gain (loss) |  | 35 |
Accumulated other comprehensive income | Items not subsequently reclassifiable to profit or loss |  |  |
Disclosure of analysis of other comprehensive income by item [Line Items] |  |  |
Actuarial gains/(losses) excluding investments accounted for using the equity method | 133 | 1,110 | 650
Actuarial gains/(losses) of investments accounted for using the equity method, net of taxes | 8 | 0 | 4
Tax effects | (60) | (333) | (212)
Items not subsequently reclassifiable to profit or loss | 85 | 787 | 451
Accumulated other comprehensive income | Items not subsequently reclassifiable to profit or loss | Equity instruments included in financial assets |  |  |
Disclosure of analysis of other comprehensive income by item [Line Items] |  |  |
Change in fair value (excluding investments accounted for using the equity method) | 3 | (3) | (4)
Change in fair value (investments accounted for using the equity method, net of taxes) | 0 | 0 | 0
Equity risk hedging instruments designated as fair value hedges | 0 | 16 | 17
Tax effects | 1 | (3) | (4)
Accumulated other comprehensive income | Items subsequently reclassifiable to profit or loss |  |  |
Disclosure of analysis of other comprehensive income by item [Line Items] |  |  |
Change in fair value (excluding investments accounted for using the equity method) | 1 | (17) | 5
Change in fair value (investments accounted for using the equity method, net of taxes) | 0 | 0 | 2
Tax effects | 0 | 4 | (1)
Currency translation differences on foreign subsidiaries (excluding investments accounted for using the equity method) | (1,089) | 3,775 | 2,643
Currency translation differences (investments accounted for using the equity method) | 6 | (11) | (11)
Hedges of net investments in foreign operations | 26 | (329) | (354)
Tax effects | (7) | 85 | 91
Items subsequently reclassifiable to profit or loss | (1,058) | 3,463 | 2,313
Accumulated other comprehensive income | Items subsequently reclassifiable to profit or loss | Debt instruments included in financial assets |  |  |
Disclosure of analysis of other comprehensive income by item [Line Items] |  |  |
Change in fair value (excluding investments accounted for using the equity method) | 6 | (52) | (77)
Change in fair value (investments accounted for using the equity method, net of taxes) | 0 | 0 | 0
Tax effects | (1) | 8 | 15
Items subsequently reclassifiable to profit or loss | 0 | 2 | 0
Accumulated other comprehensive income | Items subsequently reclassifiable to profit or loss | Cash flow and fair value hedge |  |  |
Disclosure of analysis of other comprehensive income by item [Line Items] |  |  |
Items subsequently reclassifiable to profit or loss | € 0 | € 17 | € 5

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