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Note 25 Estimated benefit payments (Details)
€ in Millions
Dec. 31, 2021
EUR (€)
Not later than one year [member]  
Estimated benefit payments [Line Items]  
Estimated benefit payments € 774
Not later than one year [member] | SPAIN  
Estimated benefit payments [Line Items]  
Estimated benefit payments 625
Not later than one year [member] | MEXICO  
Estimated benefit payments [Line Items]  
Estimated benefit payments 133
Not later than one year [member] | TURKEY  
Estimated benefit payments [Line Items]  
Estimated benefit payments 16
Later than one year and not later than two years [member]  
Estimated benefit payments [Line Items]  
Estimated benefit payments 627
Later than one year and not later than two years [member] | SPAIN  
Estimated benefit payments [Line Items]  
Estimated benefit payments 477
Later than one year and not later than two years [member] | MEXICO  
Estimated benefit payments [Line Items]  
Estimated benefit payments 139
Later than one year and not later than two years [member] | TURKEY  
Estimated benefit payments [Line Items]  
Estimated benefit payments 11
Later than two years and not later than three years [member]  
Estimated benefit payments [Line Items]  
Estimated benefit payments 556
Later than two years and not later than three years [member] | SPAIN  
Estimated benefit payments [Line Items]  
Estimated benefit payments 395
Later than two years and not later than three years [member] | MEXICO  
Estimated benefit payments [Line Items]  
Estimated benefit payments 146
Later than two years and not later than three years [member] | TURKEY  
Estimated benefit payments [Line Items]  
Estimated benefit payments 15
Later than three years and not later than four years [member]  
Estimated benefit payments [Line Items]  
Estimated benefit payments 505
Later than three years and not later than four years [member] | SPAIN  
Estimated benefit payments [Line Items]  
Estimated benefit payments 332
Later than three years and not later than four years [member] | MEXICO  
Estimated benefit payments [Line Items]  
Estimated benefit payments 155
Later than three years and not later than four years [member] | TURKEY  
Estimated benefit payments [Line Items]  
Estimated benefit payments 17
Later than four years and not later than five years [member]  
Estimated benefit payments [Line Items]  
Estimated benefit payments 471
Later than four years and not later than five years [member] | SPAIN  
Estimated benefit payments [Line Items]  
Estimated benefit payments 284
Later than four years and not later than five years [member] | MEXICO  
Estimated benefit payments [Line Items]  
Estimated benefit payments 164
Later than four years and not later than five years [member] | TURKEY  
Estimated benefit payments [Line Items]  
Estimated benefit payments 23
Later than five years and not later than ten years [member]  
Estimated benefit payments [Line Items]  
Estimated benefit payments 2,066
Later than five years and not later than ten years [member] | SPAIN  
Estimated benefit payments [Line Items]  
Estimated benefit payments 920
Later than five years and not later than ten years [member] | MEXICO  
Estimated benefit payments [Line Items]  
Estimated benefit payments 941
Later than five years and not later than ten years [member] | TURKEY  
Estimated benefit payments [Line Items]  
Estimated benefit payments € 206