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PENSIONS AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Movement in Net Defined Benefit Obligations (Details)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
EUR (€)
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance € 664 $ 664 € 670
Current service cost 30   28
Interest cost / (income) 9   11
Past service cost 32   2
Immediate recognition of gains arising over the year 0   2
Administration expenses 2   2
Remeasurements due to:      
—actual return less interest on plan assets (56)   (28)
—changes in financial assumptions (38)   67
—changes in demographic assumptions (13)   (10)
—experience losses (11)   (3)
Effects of changes in foreign exchange rates 23   (24)
Benefits paid (22)   (25)
Contributions by the Group (21)   (28)
Contributions by the plan participants 0   0
Closing balance 599   664
Defined benefit obligations      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 1,122   1,115
Current service cost 30   28
Interest cost / (income) 15   19
Past service cost 32   2
Immediate recognition of gains arising over the year 0   2
Administration expenses 0   0
Remeasurements due to:      
—actual return less interest on plan assets 0   0
—changes in financial assumptions (38)   67
—changes in demographic assumptions (13)   (10)
—experience losses (11)   (3)
Effects of changes in foreign exchange rates 55   (44)
Benefits paid (54)   (59)
Contributions by the Group 0   0
Contributions by the plan participants 5   5
Closing balance 1,143   1,122
Defined benefit obligations | Pension Benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 906   895
Current service cost 22   21
Interest cost / (income) 10   13
Past service cost 1   0
Immediate recognition of gains 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 (29)   51
—changes in demographic assumptions (13)   (6)
—experience losses (9)   (4)
Effects of changes in foreign exchange rates 38   (27)
Benefits paid (36)   (41)
Contributions by the Group 0   0
Contributions by the plan participants 4   4
Closing balance 894   906
Defined benefit obligations | Other Benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 216   220
Current service cost 8   7
Interest cost / (income) 5   6
Past service cost 31   2
Immediate recognition of gains arising over the year 0   2
Administration expenses 0   0
Remeasurements due to:      
—actual return less interest on plan assets 0   0
—changes in financial assumptions (9)   16
—changes in demographic assumptions 0   (4)
—experience losses (2)   1
Effects of changes in foreign exchange rates 17   (17)
Benefits paid (18)   (18)
Contributions by the Group 0   0
Contributions by the plan participants 1   1
Closing balance 249   216
Plan Assets      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance (458)   (445)
Current service cost 0   0
Interest cost / (income) (6)   (8)
Past service cost 0   0
Immediate recognition of gains arising over the year 0   0
Administration expenses 2   2
Remeasurements due to:      
—actual return less interest on plan assets (56)   (28)
—changes in financial assumptions 0   0
—changes in demographic assumptions 0   0
—experience losses 0   0
Effects of changes in foreign exchange rates (32)   20
Benefits paid 32   34
Contributions by the Group (21)   (28)
Contributions by the plan participants (5)   (5)
Closing balance € (544)   € (458)