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PENSIONS AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Amounts Recognized in the Consolidated Statement of Financial Position (Details) - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020
Disclosure of net defined benefit liability (asset) [line items]
Present value of funded obligation	€ 741	€ 772
Fair value of plan assets	(504)	(458)
Deficit of funded plans	237	314
Present value of unfunded obligation	344	350
Net liability arising from defined benefit obligation	581	664
Pension Benefits
Disclosure of net defined benefit liability (asset) [line items]
Present value of funded obligation	741	772
Fair value of plan assets	(504)	(458)
Deficit of funded plans	237	314
Present value of unfunded obligation	131	134
Net liability arising from defined benefit obligation	368	448
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	213	216
Net liability arising from defined benefit obligation	€ 213	€ 216

X

- Definition

Present value of unfunded obligation.

+ References

No definition available.

+ Details

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X

- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2020-01-01
-Paragraph 57
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- Definition

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

+ References

No definition available.

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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 2020-01-01
-Paragraph 55
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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 2020-01-01
-Paragraph 57
-Subparagraph a
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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 2020-01-01
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