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Note 25 Sensitivity analysis (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Actuarial assumption of discount rates [member]      
Sensitivity analysis [Line Items]      
Basis points change sensitivity analysis 0.50%    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption € (213) € (265) € (321)
Decrease In Defined Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption € 232 291 350
Actuarial assumption of expected rates of salary increases [member]      
Sensitivity analysis [Line Items]      
Basis points change sensitivity analysis 0.50%    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption € 4 4 1
Decrease In Defined Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption € (4) (4) (1)
Actuarial assumption of expected rates of pension increases [member]      
Sensitivity analysis [Line Items]      
Basis points change sensitivity analysis 0.50%    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption € 27 34 32
Decrease In Defined Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption € (26) (32) (39)
Actuarial assumption of medical cost trend rates [member]      
Sensitivity analysis [Line Items]      
Basis points change sensitivity analysis 0.50%    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption € 102 141 119
Decrease In Defined Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption € (93) (126) (106)
Change in obligation from each additional year of longevity [Member]      
Sensitivity analysis [Line Items]      
Basis points change sensitivity analysis    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption € 120 134 113
Decrease In Defined Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption € 0 € 0 € 0