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PENSION AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Plan Asset Categories (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of changes in financial position [line items]    
Cash & cash equivalents € 5 € 4
Equities 136 123
Bonds 238 226
Property 77 74
Other 32 34
Total fair value of plan assets 488 461
Quoted in an active market    
Disclosure of changes in financial position [line items]    
Cash & cash equivalents 5 4
Equities 92 87
Bonds 209 146
Property 15 14
Other 0 0
Total fair value of plan assets 321 251
Not quoted in an active market    
Disclosure of changes in financial position [line items]    
Cash & cash equivalents 0 0
Equities 44 36
Bonds 29 80
Property 62 60
Other 32 34
Total fair value of plan assets € 167 € 210