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Note 18 Changes in other intangible assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Other intangible assets [Line Items]      
Other intangible assets € 1,568 € 1,449  
Intangible assets other than goodwill 1,790 1,568 € 1,449
Computer software [member]      
Other intangible assets [Line Items]      
Other intangible assets 1,535 1,396 1,239
Additions other than through business combinations, intangible assets other than goodwill 771 688 592
Amortisation, intangible assets other than goodwill (543) (518) (490)
Amortization transfer to discontinued operations 0 0 0
Increase (decrease) through net exchange differences, intangible assets and goodwill (16) 6 (80)
Impairment 15 26 25
Intangible assets other than goodwill 1,764 1,535 1,396
Other intangible assets [member]      
Other intangible assets [Line Items]      
Other intangible assets 33 56 140
Additions other than through business combinations, intangible assets other than goodwill 11 1 0
Amortisation, intangible assets other than goodwill (18) (19) (20)
Amortization transfer to discontinued operations 0 0 0
Increase (decrease) through net exchange differences, intangible assets and goodwill 1 5 63
Impairment 0 0 0
Intangible assets other than goodwill 26 33 56
Total of intangible assets [Member]      
Other intangible assets [Line Items]      
Other intangible assets 1,568 1,453 1,379
Additions other than through business combinations, intangible assets other than goodwill 782 689 592
Amortisation, intangible assets other than goodwill (561) (536) (510)
Amortization transfer to discontinued operations 0 0 0
Increase (decrease) through net exchange differences, intangible assets and goodwill (16) 11 17
Impairment 15 26 (25)
Intangible assets other than goodwill € 1,790 € 1,568 € 1,453