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Note 25 Sensitivity analysis (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Discount rate sensitivity analysis [Member]      
Sensitivity analysis [Line Items]      
Basis points change sensitivity analysis 5000000000.00%    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption € (321) € (282) € (354)
Decrease In Defined Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption € 350 307 390
Rate of salary increase sensitivity analysis [Member]      
Sensitivity analysis [Line Items]      
Basis points change sensitivity analysis 5000000000.00%    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption € 1 2 4
Decrease In Defined Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption € (1) (2) (4)
Rate of pension increase sensitivity analysis [Member]      
Sensitivity analysis [Line Items]      
Basis points change sensitivity analysis 5000000000.00%    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption € 32 28 29
Decrease In Defined Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption € (39) (26) (27)
Medical cost trend rate sensitivity analysis [Member]      
Sensitivity analysis [Line Items]      
Basis points change sensitivity analysis 5000000000.00%    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption € 119 109 145
Decrease In Defined Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption € (106) (98) (129)
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 € 113 170 211
Decrease In Defined Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption € 0 € 0 € 0