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PENSION AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Amounts Recognized in the Consolidated Statement of Financial Position (Details) - EUR (€) € in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [line items]
Present value of funded obligation	€ 653	€ 614
Fair value of plan assets	(488)	(461)
Deficit of funded plans	165	153
Present value of unfunded obligation	246	250
Net liability / (asset) arising from defined benefit obligation	411	403
Pension Benefits
Disclosure of net defined benefit liability (asset) [line items]
Present value of funded obligation	653	614
Fair value of plan assets	(488)	(461)
Deficit of funded plans	165	153
Present value of unfunded obligation	103	96
Net liability / (asset) arising from defined benefit obligation	268	249
Other Benefits
Disclosure of net defined benefit liability (asset) [line items]
Present value of funded obligation	0	0
Fair value of plan assets	0	0
Deficit of funded plans	0	0
Present value of unfunded obligation	143	154
Net liability / (asset) arising from defined benefit obligation	€ 143	€ 154

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- Definition

Present Value Of Funded Obligation

+ References

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- Definition

Present value of unfunded obligation.

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- Definition

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- Definition

The amount of non-current net defined benefit liability. [Refer: Net defined benefit liability]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard
-URIDate 2023-03-23

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- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 57
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_57_a&doctype=Standard
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- Definition

The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]]

+ References

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-Name IAS
-Number 19
-IssueDate 2023-01-01
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