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Note 25 Medical benefits commitments (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Medical benefits commitments [Line Items]      
Medical benefits commitments € 1,728 € 1,448  
Medical benefits commitments 1,269 1,728 € 1,448
Present value of defined benefit obligation [member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments 1,728 1,448 1,377
Medical benefits commitments 1,269 1,728 1,448
Present value of defined benefit obligation [member] | Current service cost [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 18 20 19
Present value of defined benefit obligation [member] | Interest income or expense [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 167 167 144
Present value of defined benefit obligation [member] | Contributions by plan participants [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 0
Present value of defined benefit obligation [member] | Employer contributions [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 0
Present value of defined benefit obligation [member] | Past service cost [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year [1] 0 0 28
Present value of defined benefit obligation [member] | Remeasurements [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (333) (5) (215)
Present value of defined benefit obligation [member] | Return of plan assets [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year [2] 0 0 0
Present value of defined benefit obligation [member] | From changes in demographic assumptions [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 15 (70) 0
Present value of defined benefit obligation [member] | From changes in financial assumptions [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (293) 56 (191)
Present value of defined benefit obligation [member] | Other actuarial gains and losses [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (55) 8 (23)
Present value of defined benefit obligation [member] | Benefit payments [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (71) (70) (60)
Present value of defined benefit obligation [member] | Settlements payments [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 0
Present value of defined benefit obligation [member] | Total for all business combinations [member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 0
Present value of defined benefit obligation [member] | Effect on changes in foreign exchange rates [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (240) 168 155
Present value of defined benefit obligation [member] | Other effects Post employment commitments [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 0
Plan assets [member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments 1,744 1,476 1,494
Medical benefits commitments 1,367 1,744 1,476
Plan assets [member] | Current service cost [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 0
Plan assets [member] | Interest income or expense [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 168 165 157
Plan assets [member] | Contributions by plan participants [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 0
Plan assets [member] | Employer contributions [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 15 17 0
Plan assets [member] | Past service cost [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year [1] 0 0 0
Plan assets [member] | Remeasurements [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (247) (17) (144)
Plan assets [member] | Return of plan assets [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year [2] (247) (17) (144)
Plan assets [member] | From changes in demographic assumptions [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 0
Plan assets [member] | From changes in financial assumptions [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 0
Plan assets [member] | Other actuarial gains and losses [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 0
Plan assets [member] | Benefit payments [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (70) (70) (60)
Plan assets [member] | Settlements payments [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 0
Plan assets [member] | Total for all business combinations [member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 (139)
Plan assets [member] | Effect on changes in foreign exchange rates [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (243) 173 167
Plan assets [member] | Other effects Post employment commitments [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 0
Net liability asset [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments (16) (28) (116)
Medical benefits commitments (98) (16) (28)
Net liability asset [Member] | Current service cost [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 18 20 19
Net liability asset [Member] | Interest income or expense [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (2) 2 (14)
Net liability asset [Member] | Contributions by plan participants [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 0
Net liability asset [Member] | Employer contributions [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (15) (17) 0
Net liability asset [Member] | Past service cost [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year [1] 0 0 28
Net liability asset [Member] | Remeasurements [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (86) 12 (71)
Net liability asset [Member] | Return of plan assets [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year [2] 247 17 144
Net liability asset [Member] | From changes in demographic assumptions [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 15 (70) 0
Net liability asset [Member] | From changes in financial assumptions [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (293) 56 (191)
Net liability asset [Member] | Other actuarial gains and losses [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (55) 8 (23)
Net liability asset [Member] | Benefit payments [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 0
Net liability asset [Member] | Settlements payments [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 0
Net liability asset [Member] | Total for all business combinations [member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 139
Net liability asset [Member] | Effect on changes in foreign exchange rates [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 3 (5) (11)
Net liability asset [Member] | Other effects Post employment commitments [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year € 0 € 0 € 0
[1]
(1) Including gains and losses arising from settlements.
[2]
(2) Excluding interest, which is recorded under "Interest income or expense".