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Note 25 Estimated benefit payments (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2024
EUR (€)
Not later than one year [member]  
Estimated benefit payments [Line Items]  
Estimated benefit payments € 645
Not later than one year [member] | SPAIN  
Estimated benefit payments [Line Items]  
Estimated benefit payments 422
Not later than one year [member] | MEXICO  
Estimated benefit payments [Line Items]  
Estimated benefit payments 196
Not later than one year [member] | TURKEY  
Estimated benefit payments [Line Items]  
Estimated benefit payments 28
Later than one year and not later than two years [member]  
Estimated benefit payments [Line Items]  
Estimated benefit payments 514
Later than one year and not later than two years [member] | SPAIN  
Estimated benefit payments [Line Items]  
Estimated benefit payments 278
Later than one year and not later than two years [member] | MEXICO  
Estimated benefit payments [Line Items]  
Estimated benefit payments 207
Later than one year and not later than two years [member] | TURKEY  
Estimated benefit payments [Line Items]  
Estimated benefit payments 30
Later than two years and not later than three years [member]  
Estimated benefit payments [Line Items]  
Estimated benefit payments 495
Later than two years and not later than three years [member] | SPAIN  
Estimated benefit payments [Line Items]  
Estimated benefit payments 242
Later than two years and not later than three years [member] | MEXICO  
Estimated benefit payments [Line Items]  
Estimated benefit payments 215
Later than two years and not later than three years [member] | TURKEY  
Estimated benefit payments [Line Items]  
Estimated benefit payments 37
Later than three years and not later than four years [member]  
Estimated benefit payments [Line Items]  
Estimated benefit payments 482
Later than three years and not later than four years [member] | SPAIN  
Estimated benefit payments [Line Items]  
Estimated benefit payments 210
Later than three years and not later than four years [member] | MEXICO  
Estimated benefit payments [Line Items]  
Estimated benefit payments 225
Later than three years and not later than four years [member] | TURKEY  
Estimated benefit payments [Line Items]  
Estimated benefit payments 47
Later than four years and not later than five years [member]  
Estimated benefit payments [Line Items]  
Estimated benefit payments 477
Later than four years and not later than five years [member] | SPAIN  
Estimated benefit payments [Line Items]  
Estimated benefit payments 181
Later than four years and not later than five years [member] | MEXICO  
Estimated benefit payments [Line Items]  
Estimated benefit payments 235
Later than four years and not later than five years [member] | TURKEY  
Estimated benefit payments [Line Items]  
Estimated benefit payments 60
Later than five years and not later than ten years [member]  
Estimated benefit payments [Line Items]  
Estimated benefit payments 2,645
Later than five years and not later than ten years [member] | SPAIN  
Estimated benefit payments [Line Items]  
Estimated benefit payments 618
Later than five years and not later than ten years [member] | MEXICO  
Estimated benefit payments [Line Items]  
Estimated benefit payments 1,331
Later than five years and not later than ten years [member] | TURKEY  
Estimated benefit payments [Line Items]  
Estimated benefit payments € 696