v3.26.1
Provisions for employee benefits - Plan assets (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure Of Benefit Plans [Line Items]    
Cash and cash equivalents € 9 € 4
Equity securities 24 25
Debt securities 126 125
Real estate 11 11
Derivatives 41 43
Investment funds   1
Assets held by insurance companies 34 35
Other 15 19
Total 260 263
Level 1    
Disclosure Of Benefit Plans [Line Items]    
Cash and cash equivalents 9 4
Equity securities 24 25
Debt securities 126 125
Real estate 11 11
Derivatives 41 43
Investment funds   1
Assets held by insurance companies 4 32
Other 15 19
Total 230 260
Level 2 and 3 of fair value hierarchy    
Disclosure Of Benefit Plans [Line Items]    
Assets held by insurance companies 30 3
Total € 30 € 3