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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, 2020	Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]
Present value of funded obligation	€ 789	€ 768
Fair value of plan assets	(435)	(445)
Deficit of funded plans	354	323
Present value of unfunded obligation	361	347
Net liability arising from defined benefit obligation	715	670
Pension Benefits
Disclosure of net defined benefit liability (asset) [line items]
Present value of funded obligation	789	768
Fair value of plan assets	(435)	(445)
Deficit of funded plans	354	323
Present value of unfunded obligation	131	127
Net liability arising from defined benefit obligation	485	450
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	230	220
Net liability arising from defined benefit obligation	€ 230	€ 220

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- 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 2019-01-01
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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
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-Number 1
-IssueDate 2019-01-01
-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 2019-01-01
-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 2019-01-01
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