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Financial derivatives at fair value statement and equity (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Increase decrease in net financial derivatives € (44)    
Increase decrease in net financial derivatives with effect on reserves 113    
Increase decrease in net financial derivatives fair value effect on profit and loss (5)    
Increase decrease in net financial derivatives with effect on final profit and loss 4    
Increase decrease in net financial derivatives with effect on cash 59    
Increase decrease in net financial derivatives with effect on exchange rate (131)    
Increase decrease in net financial derivatives with effect on other balance sheetor income statement items (84)    
At fair value [member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Net financial derivatives 109 € 109 € 153
Increase decrease in net financial derivatives (44)    
Inflation derivatives [Member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Increase decrease in net financial derivatives 19    
Increase decrease in net financial derivatives with effect on reserves 12    
Increase decrease in net financial derivatives fair value effect on profit and loss 6    
Increase decrease in net financial derivatives with effect on final profit and loss 4    
Increase decrease in net financial derivatives with effect on cash (11)    
Increase decrease in net financial derivatives with effect on exchange rate 0    
Increase decrease in net financial derivatives with effect on other balance sheetor income statement items 8    
Inflation derivatives [Member] | At fair value [member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Net financial derivatives   134 115
Increase decrease in net financial derivatives 19    
Inflation derivatives [Member] | Cash flow hedge [Member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Increase decrease in net financial derivatives 19    
Increase decrease in net financial derivatives with effect on reserves 12    
Increase decrease in net financial derivatives fair value effect on profit and loss 6    
Increase decrease in net financial derivatives with effect on final profit and loss 4    
Increase decrease in net financial derivatives with effect on cash (11)    
Increase decrease in net financial derivatives with effect on exchange rate 0    
Increase decrease in net financial derivatives with effect on other balance sheetor income statement items 8    
Inflation derivatives [Member] | Cash flow hedge [Member] | At fair value [member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Net financial derivatives   134 115
Increase decrease in net financial derivatives 19    
Interest rate derivatives [Member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Increase decrease in net financial derivatives (17)    
Increase decrease in net financial derivatives with effect on reserves 26    
Increase decrease in net financial derivatives fair value effect on profit and loss 3    
Increase decrease in net financial derivatives with effect on final profit and loss (1)    
Increase decrease in net financial derivatives with effect on cash (1)    
Increase decrease in net financial derivatives with effect on exchange rate 1    
Increase decrease in net financial derivatives with effect on other balance sheetor income statement items (45)    
Interest rate derivatives [Member] | At fair value [member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Net financial derivatives   (57) (39)
Increase decrease in net financial derivatives (17)    
Interest rate derivatives [Member] | Cash flow hedge [Member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Increase decrease in net financial derivatives (17)    
Increase decrease in net financial derivatives with effect on reserves 17    
Increase decrease in net financial derivatives fair value effect on profit and loss 3    
Increase decrease in net financial derivatives with effect on final profit and loss (1)    
Increase decrease in net financial derivatives with effect on cash (1)    
Increase decrease in net financial derivatives with effect on exchange rate 1    
Increase decrease in net financial derivatives with effect on other balance sheetor income statement items (36)    
Interest rate derivatives [Member] | Cash flow hedge [Member] | At fair value [member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Net financial derivatives   (57) (39)
Increase decrease in net financial derivatives (17)    
Interest rate derivatives [Member] | Fair value hedge [Member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Increase decrease in net financial derivatives 0    
Increase decrease in net financial derivatives with effect on reserves 9    
Increase decrease in net financial derivatives fair value effect on profit and loss 0    
Increase decrease in net financial derivatives with effect on final profit and loss 0    
Increase decrease in net financial derivatives with effect on cash 0    
Increase decrease in net financial derivatives with effect on exchange rate 0    
Increase decrease in net financial derivatives with effect on other balance sheetor income statement items (9)    
Interest rate derivatives [Member] | Fair value hedge [Member] | At fair value [member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Net financial derivatives   0 0
Increase decrease in net financial derivatives 0    
Cross currency swaps [Member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Increase decrease in net financial derivatives (17)    
Increase decrease in net financial derivatives with effect on reserves 77    
Increase decrease in net financial derivatives fair value effect on profit and loss (19)    
Increase decrease in net financial derivatives with effect on final profit and loss 7    
Increase decrease in net financial derivatives with effect on cash 12    
Increase decrease in net financial derivatives with effect on exchange rate (109)    
Increase decrease in net financial derivatives with effect on other balance sheetor income statement items 15    
Cross currency swaps [Member] | At fair value [member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Net financial derivatives   42 58
Increase decrease in net financial derivatives (17)    
Cross currency swaps [Member] | Cash flow hedge [Member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Increase decrease in net financial derivatives 14    
Increase decrease in net financial derivatives with effect on reserves (1)    
Increase decrease in net financial derivatives fair value effect on profit and loss 0    
Increase decrease in net financial derivatives with effect on final profit and loss 7    
Increase decrease in net financial derivatives with effect on cash (7)    
Increase decrease in net financial derivatives with effect on exchange rate 0    
Increase decrease in net financial derivatives with effect on other balance sheetor income statement items 15    
Cross currency swaps [Member] | Cash flow hedge [Member] | At fair value [member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Net financial derivatives   1 (13)
Increase decrease in net financial derivatives 14    
Cross currency swaps [Member] | Fair value hedge [Member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Increase decrease in net financial derivatives 0    
Increase decrease in net financial derivatives with effect on reserves 0    
Increase decrease in net financial derivatives fair value effect on profit and loss 0    
Increase decrease in net financial derivatives with effect on final profit and loss 0    
Increase decrease in net financial derivatives with effect on cash 0    
Increase decrease in net financial derivatives with effect on exchange rate 0    
Increase decrease in net financial derivatives with effect on other balance sheetor income statement items 0    
Cross currency swaps [Member] | Fair value hedge [Member] | At fair value [member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Net financial derivatives   0 0
Increase decrease in net financial derivatives 0    
Cross currency swaps [Member] | Hedge of net investment in foreign [Member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Increase decrease in net financial derivatives (31)    
Increase decrease in net financial derivatives with effect on reserves 78    
Increase decrease in net financial derivatives fair value effect on profit and loss (19)    
Increase decrease in net financial derivatives with effect on final profit and loss 0    
Increase decrease in net financial derivatives with effect on cash 19    
Increase decrease in net financial derivatives with effect on exchange rate (109)    
Increase decrease in net financial derivatives with effect on other balance sheetor income statement items 0    
Cross currency swaps [Member] | Hedge of net investment in foreign [Member] | At fair value [member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Net financial derivatives   41 72
Increase decrease in net financial derivatives (31)    
Foreign exchange derivatives member [Member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Increase decrease in net financial derivatives (38)    
Increase decrease in net financial derivatives with effect on reserves (2)    
Increase decrease in net financial derivatives fair value effect on profit and loss (12)    
Increase decrease in net financial derivatives with effect on final profit and loss (6)    
Increase decrease in net financial derivatives with effect on cash 65    
Increase decrease in net financial derivatives with effect on exchange rate (23)    
Increase decrease in net financial derivatives with effect on other balance sheetor income statement items (60)    
Foreign exchange derivatives member [Member] | At fair value [member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Net financial derivatives   (39) (1)
Increase decrease in net financial derivatives (38)    
Foreign exchange derivatives member [Member] | Cash flow hedge [Member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Increase decrease in net financial derivatives (2)    
Increase decrease in net financial derivatives with effect on reserves (2)    
Increase decrease in net financial derivatives fair value effect on profit and loss 1    
Increase decrease in net financial derivatives with effect on final profit and loss 0    
Increase decrease in net financial derivatives with effect on cash 58    
Increase decrease in net financial derivatives with effect on exchange rate 0    
Increase decrease in net financial derivatives with effect on other balance sheetor income statement items (59)    
Foreign exchange derivatives member [Member] | Cash flow hedge [Member] | At fair value [member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Net financial derivatives   (2) 0
Increase decrease in net financial derivatives (2)    
Foreign exchange derivatives member [Member] | Fair value hedge [Member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Increase decrease in net financial derivatives (5)    
Increase decrease in net financial derivatives with effect on reserves 0    
Increase decrease in net financial derivatives fair value effect on profit and loss (1)    
Increase decrease in net financial derivatives with effect on final profit and loss 0    
Increase decrease in net financial derivatives with effect on cash 0    
Increase decrease in net financial derivatives with effect on exchange rate (4)    
Increase decrease in net financial derivatives with effect on other balance sheetor income statement items 0    
Foreign exchange derivatives member [Member] | Fair value hedge [Member] | At fair value [member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Net financial derivatives   (5) 0
Increase decrease in net financial derivatives (5)    
Foreign exchange derivatives member [Member] | Hedge of net investment in foreign [Member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Increase decrease in net financial derivatives (30)    
Increase decrease in net financial derivatives with effect on reserves 0    
Increase decrease in net financial derivatives fair value effect on profit and loss (5)    
Increase decrease in net financial derivatives with effect on final profit and loss (6)    
Increase decrease in net financial derivatives with effect on cash 0    
Increase decrease in net financial derivatives with effect on exchange rate (19)    
Increase decrease in net financial derivatives with effect on other balance sheetor income statement items 0    
Foreign exchange derivatives member [Member] | Hedge of net investment in foreign [Member] | At fair value [member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Net financial derivatives   (38) (8)
Increase decrease in net financial derivatives (30)    
Foreign exchange derivatives member [Member] | Speculative [Member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Increase decrease in net financial derivatives (1)    
Increase decrease in net financial derivatives with effect on reserves 0    
Increase decrease in net financial derivatives fair value effect on profit and loss (7)    
Increase decrease in net financial derivatives with effect on final profit and loss 0    
Increase decrease in net financial derivatives with effect on cash 7    
Increase decrease in net financial derivatives with effect on exchange rate 0    
Increase decrease in net financial derivatives with effect on other balance sheetor income statement items (1)    
Foreign exchange derivatives member [Member] | Speculative [Member] | At fair value [member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Net financial derivatives   6 7
Increase decrease in net financial derivatives (1)    
Equity swaps [Member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Increase decrease in net financial derivatives 9    
Increase decrease in net financial derivatives with effect on reserves 0    
Increase decrease in net financial derivatives fair value effect on profit and loss 17    
Increase decrease in net financial derivatives with effect on final profit and loss 0    
Increase decrease in net financial derivatives with effect on cash (6)    
Increase decrease in net financial derivatives with effect on exchange rate 0    
Increase decrease in net financial derivatives with effect on other balance sheetor income statement items (2)    
Equity swaps [Member] | At fair value [member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Net financial derivatives   29 20
Increase decrease in net financial derivatives 9    
Equity swaps [Member] | Speculative [Member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Increase decrease in net financial derivatives 9    
Increase decrease in net financial derivatives with effect on reserves 0    
Increase decrease in net financial derivatives fair value effect on profit and loss 17    
Increase decrease in net financial derivatives with effect on final profit and loss 0    
Increase decrease in net financial derivatives with effect on cash (6)    
Increase decrease in net financial derivatives with effect on exchange rate 0    
Increase decrease in net financial derivatives with effect on other balance sheetor income statement items (2)    
Equity swaps [Member] | Speculative [Member] | At fair value [member]      
Financial derivatives at fair value or effect on income statement and equity [Line Items]      
Net financial derivatives   € 29 € 20
Increase decrease in net financial derivatives € 9