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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, 2024
Jun. 30, 2023
Dec. 31, 2023
Disclosure of analysis of other comprehensive income by item [Line Items]      
Items not subsequently reclassifiable to profit or loss € 166 € 85 € (77)
Items subsequently reclassifiable to profit or loss 1,067 (1,058) (1,526)
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 235 133 (171)
Actuarial gains/(losses) of investments accounted for using the equity method, net of taxes 0 8 0
Tax effects (57) (60) 18
Items not subsequently reclassifiable to profit or loss 166 85 (77)
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) (10) 3 97
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 0 0
Tax effects (2) 1 (21)
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] (4) 1 1
Change in fair value (investments accounted for using the equity method, net of taxes) 1 0 (2)
Tax effects 1 0 0
Currency translation differences on foreign subsidiaries (excluding investments accounted for using the equity method) [2] 1,167 (1,089) (1,551)
Currency translation differences (investments accounted for using the equity method) (1) 6 3
Hedges of net investments in foreign operations (126) 26 8
Tax effects 33 (7) (2)
Items subsequently reclassifiable to profit or loss 1,067 (1,058) (1,526)
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) [3] (5) 6 21
Change in fair value (investments accounted for using the equity method, net of taxes) 0 0 0
Tax effects € 1 (1) (4)
Accumulated other comprehensive income | Items subsequently reclassifiable to profit or loss | Foreign Currency Translation      
Disclosure of analysis of other comprehensive income by item [Line Items]      
Items subsequently reclassifiable to profit or loss   € (14) € (56)
[1] Includes reclassifications to profit or loss: immaterial over all periods.
[2] Currency translation differences on foreign subsidiaries are mainly due to the appreciation of the US dollar.
    Includes a reclassification to profit or loss: immaterial in the first half of 2024 , €(56) million in 2023 and €(14) million in the first half of 2023.
[3] Includes reclassifications to profit or loss: immaterial over all periods.