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Derivative Financial Instruments and Risk Management Policies - Evolution of Cost of Hedges in Equity (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Changes in Cost of Hedging in Equity [Roll Forward]    
Balance of cost of hedging in equity at beginning of period € 32 € (56)
Changes in the fair value registered in equity (44) 96
Transfer to the income statement of the period - the hedged item has affected profit or loss (7) (8)
Balance of cost of hedging in equity at end of period (19) 32
Exchange rate risk    
Changes in Cost of Hedging in Equity [Roll Forward]    
Balance of cost of hedging in equity at beginning of period 43 (75)
Changes in the fair value registered in equity (59) 128
Transfer to the income statement of the period - the hedged item has affected profit or loss (9) (10)
Balance of cost of hedging in equity at end of period (25) 43
Total gross amount    
Changes in Cost of Hedging in Equity [Roll Forward]    
Balance of cost of hedging in equity at beginning of period 43 (75)
Changes in the fair value registered in equity (59) 128
Transfer to the income statement of the period - the hedged item has affected profit or loss (9) (10)
Balance of cost of hedging in equity at end of period (25) 43
Tax effect    
Changes in Cost of Hedging in Equity [Roll Forward]    
Balance of cost of hedging in equity at beginning of period (11) 19
Changes in the fair value registered in equity 15 (32)
Transfer to the income statement of the period - the hedged item has affected profit or loss 2 2
Balance of cost of hedging in equity at end of period € 6 € (11)