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PENSIONS AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Amounts Recognized in the Consolidated Income Statement (Details) - EUR (€) € in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disclosure of defined benefit plans [line items]
Current service cost	€ (5)	€ (5)	€ (10)	€ (10)
Net interest	(5)	(4)	(8)	(8)
Immediate recognition of gains arising over the year	1	0	1	0
Administration expenses	0	0	(1)	(1)
Total	(9)	(9)	(18)	(19)
Pension Benefits
Disclosure of defined benefit plans [line items]
Current service cost	(4)	(3)	(8)	(7)
Net interest	(3)	(3)	(4)	(5)
Immediate recognition of gains arising over the year	0	0	0	0
Administration expenses	0	0	(1)	(1)
Total	(7)	(6)	(13)	(13)
Other Benefits
Disclosure of defined benefit plans [line items]
Current service cost	(1)	(2)	(2)	(3)
Net interest	(2)	(1)	(4)	(3)
Immediate recognition of gains arising over the year	1	0	1	0
Administration expenses	0	0	0	0
Total	€ (2)	€ (3)	€ (5)	€ (6)

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- Definition

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- Definition

The amount of expenses that the entity classifies as being administrative.

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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