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Note 25 Medical benefits commitments (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Medical benefits commitments [Line Items]      
Medical benefits commitments € 1,377 € 1,562  
Medical benefits commitments 1,448 1,377 € 1,562
Present value of defined benefit obligation [member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments 1,377 1,562 1,580
Medical benefits commitments 1,448 1,377 1,562
Present value of defined benefit obligation [member] | Current service cost [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 19 24 21
Present value of defined benefit obligation [member] | Interest income or expense [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 144 131 117
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] 28 (5) (8)
Present value of defined benefit obligation [member] | Remeasurements [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (215) (377) 95
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 0 (115) 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 (191) (257) 110
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 (23) (4) (15)
Present value of defined benefit obligation [member] | Benefit payments [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (60) (49) (37)
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] | 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 155 90 (207)
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 1,494 1,484 1,532
Medical benefits commitments 1,476 1,494 1,484
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 157 129 120
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 0 1 22
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 (144) (119) 66
Plan assets [member] | Return of plan assets [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year [2] (144) (119) 66
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 (60) (48) (37)
Plan assets [member] | Settlements payments [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 0
Plan assets [member] | Business combinations [member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (139) (39) (19)
Plan assets [member] | Effect on changes in foreign exchange rates [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 167 86 (201)
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 (116) 77 48
Medical benefits commitments (28) (116) 77
Net liability asset [Member] | Current service cost [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 19 24 21
Net liability asset [Member] | Interest income or expense [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (14) 2 (3)
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 0 (1) (22)
Net liability asset [Member] | Past service cost [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year [1] 28 (5) (8)
Net liability asset [Member] | Remeasurements [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (71) (257) 30
Net liability asset [Member] | Return of plan assets [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year [2] 144 119 (66)
Net liability asset [Member] | From changes in demographic assumptions [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 (115) 0
Net liability asset [Member] | From changes in financial assumptions [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (191) (257) 110
Net liability asset [Member] | Other actuarial gains and losses [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (23) (4) (15)
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] | Business combinations [member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 139 39 19
Net liability asset [Member] | Effect on changes in foreign exchange rates [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (11) 4 (6)
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".