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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