v3.25.4
Intangible assets excluding goodwill - Intangible assets excluding goodwill (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period € 2,982 € 3,190
Additions 393 361
Assets available for use 0 0
Acquisitions 0 0
Amortization (464) (506)
Impairments (58) (188)
Divestments and transfers to assets classified as held for sale (63)  
Translation differences and other (220) 134
Total change (413) (209)
Intangible assets other than goodwill at end of period 2,569 2,982
Brand names    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period 98 118
Additions 0 0
Assets available for use 0 0
Amortization (17) (19)
Impairments 0 (7)
Divestments and transfers to assets classified as held for sale 0 0
Translation differences and other (8) 6
Total change (25) (20)
Intangible assets other than goodwill at end of period 73 98
Customer relationships    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period 823 875
Additions 0 0
Assets available for use 0 0
Amortization (77) (92)
Impairments 0 0
Divestments and transfers to assets classified as held for sale (1) (11)
Translation differences and other (86) 51
Total change (164) (52)
Intangible assets other than goodwill at end of period 659 823
Technology    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period 855 1,013
Additions 37 36
Assets available for use 0 0
Amortization (118) (138)
Impairments (27) (135)
Divestments and transfers to assets classified as held for sale 0 0
Translation differences and other (64) 79
Total change (171) (158)
Intangible assets other than goodwill at end of period 684 855
Product development    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period 418 336
Additions 0 0
Assets available for use 321 266
Amortization (162) (162)
Impairments 0 (13)
Divestments and transfers to assets classified as held for sale (58) 0
Translation differences and other (19) (9)
Total change 83 82
Intangible assets other than goodwill at end of period 500 418
Product development in progress    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period 523 544
Additions 261 240
Assets available for use (321) (266)
Amortization 0 0
Impairments (16) (24)
Divestments and transfers to assets classified as held for sale (5) 0
Translation differences and other (40) 29
Total change (120) (21)
Intangible assets other than goodwill at end of period 403 523
Software    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period 265 267
Additions 93 85
Assets available for use 0 0
Amortization (90) (95)
Impairments (14) (7)
Divestments and transfers to assets classified as held for sale 0 0
Translation differences and other (4) 15
Total change (14) (3)
Intangible assets other than goodwill at end of period 250 265
Other    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period 0 38
Additions 0 0
Assets available for use 0 0
Amortization 0 (1)
Impairments 0 (1)
Divestments and transfers to assets classified as held for sale 0  
Translation differences and other 0 (37)
Total change 0 (38)
Intangible assets other than goodwill at end of period 0 0
Other    
Intangible assets excluding goodwill [Line Items]    
Divestments and transfers to assets classified as held for sale   1
Total    
Intangible assets excluding goodwill [Line Items]    
Divestments and transfers to assets classified as held for sale   (10)
Cost    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period 10,559 10,265
Intangible assets other than goodwill at end of period 9,752 10,559
Cost | Brand names    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period 671 629
Intangible assets other than goodwill at end of period 530 671
Cost | Customer relationships    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period 2,722 2,593
Intangible assets other than goodwill at end of period 2,423 2,722
Cost | Technology    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period 2,900 2,908
Intangible assets other than goodwill at end of period 2,590 2,900
Cost | Product development    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period 2,659 2,432
Intangible assets other than goodwill at end of period 2,705 2,659
Cost | Product development in progress    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period 624 635
Intangible assets other than goodwill at end of period 510 624
Cost | Software    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period 984 929
Intangible assets other than goodwill at end of period 995 984
Cost | Other    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period 0 139
Intangible assets other than goodwill at end of period 0 0
Amortization / impairments    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period (7,578) (7,075)
Intangible assets other than goodwill at end of period (7,183) (7,578)
Amortization / impairments | Brand names    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period (573) (511)
Intangible assets other than goodwill at end of period (457) (573)
Amortization / impairments | Customer relationships    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period (1,899) (1,718)
Intangible assets other than goodwill at end of period (1,764) (1,899)
Amortization / impairments | Technology    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period (2,044) (1,895)
Intangible assets other than goodwill at end of period (1,906) (2,044)
Amortization / impairments | Product development    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period (2,241) (2,096)
Intangible assets other than goodwill at end of period (2,204) (2,241)
Amortization / impairments | Product development in progress    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period (101) (91)
Intangible assets other than goodwill at end of period (108) (101)
Amortization / impairments | Software    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period (719) (662)
Intangible assets other than goodwill at end of period (745) (719)
Amortization / impairments | Other    
Intangible assets excluding goodwill [Line Items]    
Intangible assets other than goodwill at beginning of period 0 (101)
Intangible assets other than goodwill at end of period € 0 € 0