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Note 25 Medical benefits commitments (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Medical benefits commitments [Line Items]      
Medical benefits commitments € 1,562 € 1,580  
Medical benefits commitments 1,377 1,562 € 1,580
Present value of defined benefit obligation [member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments 1,562 1,580 1,114
Medical benefits commitments 1,377 1,562 1,580
Present value of defined benefit obligation [member] | Current service cost [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 24 21 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 131 117 119
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] (5) (8) 0
Present value of defined benefit obligation [member] | Remeasurements [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (377) 95 298
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 (115) 0 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 (257) 110 311
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 (4) (15) (13)
Present value of defined benefit obligation [member] | Benefit payments [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (49) (37) (39)
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 90 (207) 68
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 (1)
Plan assets [member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments 1,484 1,532 1,146
Medical benefits commitments 1,494 1,484 1,532
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 129 120 123
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 1 22 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 (119) 66 224
Plan assets [member] | Return of plan assets [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year [2] (119) 66 224
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 (48) (37) (39)
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 (39) (19) 7
Plan assets [member] | Effect on changes in foreign exchange rates [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 86 (201) 71
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 77 48 (32)
Medical benefits commitments (116) 77 48
Net liability asset [Member] | Current service cost [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 24 21 21
Net liability asset [Member] | Interest income or expense [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 2 (3) (4)
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 (1) (22) 0
Net liability asset [Member] | Past service cost [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year [1] (5) (8) 0
Net liability asset [Member] | Remeasurements [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (257) 30 74
Net liability asset [Member] | Return of plan assets [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year [2] 119 (66) (224)
Net liability asset [Member] | From changes in demographic assumptions [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (115) 0 0
Net liability asset [Member] | From changes in financial assumptions [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (257) 110 311
Net liability asset [Member] | Other actuarial gains and losses [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year (4) (15) (13)
Net liability asset [Member] | Benefit payments [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 0 0 (1)
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 39 19 (7)
Net liability asset [Member] | Effect on changes in foreign exchange rates [Member]      
Medical benefits commitments [Line Items]      
Medical benefits commitments changes of the year 4 (6) (2)
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] (*) Including gains and losses arising from settlements.
[2] (**) Excluding interest, which is recorded under "Interest income or expense".