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PENSION AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Movement in Net Defined Benefit Obligations (Details)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
EUR (€)
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance € 403 $ 403 € 599
Current service cost 19   28
Interest cost / (income) 16   11
Past service cost 0   (47)
Immediate recognition of losses arising over the year 1   (5)
Administration expenses 3   2
Remeasurements due to:      
—actual return less interest on plan assets (21)   107
—changes in financial assumptions 33   (254)
—changes in demographic assumptions 0   (1)
—experience losses 3   (12)
Effects of changes in foreign exchange rates (4)   20
Benefits paid (19)   (6)
Contributions by the Group (20)   (38)
Contributions by the plan participants 0   0
Disposed of through business combination (3)    
Reclassification as liabilities of disposal group classified as held for sale     (1)
Closing balance 411   403
Defined benefit obligations      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 864   1,143
Current service cost 19   28
Interest cost / (income) 32   20
Past service cost (4)   (47)
Immediate recognition of losses arising over the year 1   (5)
Administration expenses 0   0
Remeasurements due to:      
—actual return less interest on plan assets 0   0
—changes in financial assumptions 33   (254)
—changes in demographic assumptions 0   (1)
—experience losses 3   (12)
Effects of changes in foreign exchange rates 3   50
Benefits paid (54)   (63)
Contributions by the Group 0   0
Contributions by the plan participants 5   6
Disposed of through business combination (3)    
Reclassification as liabilities of disposal group classified as held for sale     (1)
Closing balance 899   864
Defined benefit obligations | Pension Benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 710   894
Current service cost 14   20
Interest cost / (income) 25   13
Past service cost (4)   2
Immediate recognition of losses arising over the year 0   0
Administration expenses 0   0
Remeasurements due to:      
—actual return less interest on plan assets 0   0
—changes in financial assumptions 31   (211)
—changes in demographic assumptions 0   0
—experience losses 8   (3)
Effects of changes in foreign exchange rates 8   34
Benefits paid (38)   (42)
Contributions by the Group 0   0
Contributions by the plan participants 4   4
Disposed of through business combination (2)    
Reclassification as liabilities of disposal group classified as held for sale     (1)
Closing balance 756   710
Defined benefit obligations | Other Benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 154   249
Current service cost 5   8
Interest cost / (income) 7   7
Past service cost 0   (49)
Immediate recognition of losses arising over the year 1   (5)
Administration expenses 0   0
Remeasurements due to:      
—actual return less interest on plan assets 0   0
—changes in financial assumptions 2   (43)
—changes in demographic assumptions 0   (1)
—experience losses (5)   (9)
Effects of changes in foreign exchange rates (5)   16
Benefits paid (16)   (21)
Contributions by the Group 0   0
Contributions by the plan participants 1   2
Disposed of through business combination (1)    
Reclassification as liabilities of disposal group classified as held for sale     0
Closing balance 143   154
Plan Assets      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance (461)   (544)
Current service cost 0   0
Interest cost / (income) (16)   (9)
Past service cost 4   0
Immediate recognition of losses arising over the year 0   0
Administration expenses 3   2
Remeasurements due to:      
—actual return less interest on plan assets (21)   107
—changes in financial assumptions 0   0
—changes in demographic assumptions 0   0
—experience losses 0   0
Effects of changes in foreign exchange rates (7)   (30)
Benefits paid 35   57
Contributions by the Group (20)   (38)
Contributions by the plan participants (5)   (6)
Disposed of through business combination 0    
Reclassification as liabilities of disposal group classified as held for sale     0
Closing balance € (488)   € (461)