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Derivative Financial Instruments and Risk Management Policies - Evolution of Hedges in Equity (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Changes in Hedges in Equity [Roll Forward]    
Balance of hedges in equity at beginning of period € 725 € 437
Changes in the fair value registered in equity (469) 820
Transfer to the initial value of hedged item 15 (6)
Transfer to the income statement of the period - the hedged future cash flows are no longer expected to happen 0 1
Transfer to the income statement of the period - the hedged item has affected profit or loss (53) 530
Total translation differences (4) 3
Other movements (7) 0
Balance of hedges in equity at end of period 313 725
Derivative instruments | Net investment hedges    
Changes in Hedges in Equity [Roll Forward]    
Balance of hedges in equity at beginning of period (30) 705
Changes in the fair value registered in equity (66) (743)
Transfer to the initial value of hedged item 0 0
Transfer to the income statement of the period - the hedged future cash flows are no longer expected to happen 0 0
Transfer to the income statement of the period - the hedged item has affected profit or loss 0 (10)
Total translation differences (1) (6)
Other movements (3) 4
Balance of hedges in equity at end of period (100) (30)
Amounts remaining in equity for continuing hedges (100) (30)
Amounts remaining in equity from any hedging relationship for which hedge accounting is no longer applied 0 0
Derivative instruments | Interest rate risk | Cash flow hedges    
Changes in Hedges in Equity [Roll Forward]    
Balance of hedges in equity at beginning of period (37) (70)
Changes in the fair value registered in equity (49) 4
Transfer to the initial value of hedged item 1 1
Transfer to the income statement of the period - the hedged future cash flows are no longer expected to happen 0 0
Transfer to the income statement of the period - the hedged item has affected profit or loss (32) (26)
Total translation differences (3) 2
Other movements 0 0
Balance of hedges in equity at end of period (56) (37)
Amounts remaining in equity for continuing hedges (33) 10
Amounts remaining in equity from any hedging relationship for which hedge accounting is no longer applied (23) (47)
Derivative instruments | Exchange rate risk | Cash flow hedges    
Changes in Hedges in Equity [Roll Forward]    
Balance of hedges in equity at beginning of period 861 247
Changes in the fair value registered in equity (445) 1,235
Transfer to the initial value of hedged item 6 (2)
Transfer to the income statement of the period - the hedged future cash flows are no longer expected to happen 0 1
Transfer to the income statement of the period - the hedged item has affected profit or loss (19) 620
Total translation differences 0 0
Other movements 0 0
Balance of hedges in equity at end of period 441 861
Amounts remaining in equity for continuing hedges 408 826
Amounts remaining in equity from any hedging relationship for which hedge accounting is no longer applied 33 35
Derivative instruments | Interest rate and exchange rate risk | Cash flow hedges    
Changes in Hedges in Equity [Roll Forward]    
Balance of hedges in equity at beginning of period 210 (270)
Changes in the fair value registered in equity (66) 612
Transfer to the initial value of hedged item 13 (7)
Transfer to the income statement of the period - the hedged future cash flows are no longer expected to happen 0 0
Transfer to the income statement of the period - the hedged item has affected profit or loss (19) 127
Total translation differences 0 2
Other movements 0 0
Balance of hedges in equity at end of period 176 210
Amounts remaining in equity for continuing hedges 250 290
Amounts remaining in equity from any hedging relationship for which hedge accounting is no longer applied (74) (80)
No derivative instruments | Net investment hedges    
Changes in Hedges in Equity [Roll Forward]    
Balance of hedges in equity at beginning of period (9) (5)
Changes in the fair value registered in equity 2 (4)
Transfer to the initial value of hedged item 0 0
Transfer to the income statement of the period - the hedged future cash flows are no longer expected to happen 0 0
Transfer to the income statement of the period - the hedged item has affected profit or loss 0 0
Total translation differences 0 0
Other movements (4) 0
Balance of hedges in equity at end of period (11) (9)
Amounts remaining in equity for continuing hedges (11) (9)
Amounts remaining in equity from any hedging relationship for which hedge accounting is no longer applied 0 0
Total gross amount    
Changes in Hedges in Equity [Roll Forward]    
Balance of hedges in equity at beginning of period 995 607
Changes in the fair value registered in equity (624) 1,104
Transfer to the initial value of hedged item 20 (8)
Transfer to the income statement of the period - the hedged future cash flows are no longer expected to happen 0 1
Transfer to the income statement of the period - the hedged item has affected profit or loss (70) 711
Total translation differences (4) (2)
Other movements (7) 4
Balance of hedges in equity at end of period 450 995
Amounts remaining in equity for continuing hedges 514 1,087
Amounts remaining in equity from any hedging relationship for which hedge accounting is no longer applied (64) (92)
Tax effect    
Changes in Hedges in Equity [Roll Forward]    
Balance of hedges in equity at beginning of period (270) (170)
Changes in the fair value registered in equity 155 (284)
Transfer to the initial value of hedged item (5) 2
Transfer to the income statement of the period - the hedged future cash flows are no longer expected to happen 0 0
Transfer to the income statement of the period - the hedged item has affected profit or loss 17 (181)
Total translation differences 0 5
Other movements 0 (4)
Balance of hedges in equity at end of period (137) (270)
Interest expenses | Derivative instruments | Interest rate risk | Cash flow hedges    
Changes in Hedges in Equity [Roll Forward]    
Transfer to the income statement of the period - the hedged item has affected profit or loss (240) (181)
Interest expenses | Derivative instruments | Exchange rate risk | Cash flow hedges    
Changes in Hedges in Equity [Roll Forward]    
Transfer to the income statement of the period - the hedged item has affected profit or loss € 324 € (536)