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FINANCIAL INSTRUMENTS - Financial Assets and Liabilities by Categories (Details) - EUR (€) € in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Financial assets	€ 837	€ 606
Financial liabilities	3,131	3,173
Trade payables and fixed assets payables
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	653	754
Borrowings
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	2,391	2,361
Other financial liabilities
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	87	58
At amortized cost
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	3,044	3,115
At amortized cost | Trade payables and fixed assets payables
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	653	754
At amortized cost | Borrowings
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	2,391	2,361
At amortized cost | Other financial liabilities
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	0	0
At Fair Value through Profit and loss
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	85	44
At Fair Value through Profit and loss | Trade payables and fixed assets payables
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	0	0
At Fair Value through Profit and loss | Borrowings
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	0	0
At Fair Value through Profit and loss | Other financial liabilities
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	85	44
At Fair Value through OCI
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	2	14
At Fair Value through OCI | Trade payables and fixed assets payables
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	0	0
At Fair Value through OCI | Borrowings
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	0	0
At Fair Value through OCI | Other financial liabilities
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	2	14
Cash and cash equivalents
Disclosure of detailed information about financial instruments [line items]
Financial assets	439	184
Trade receivables
Disclosure of detailed information about financial instruments [line items]
Financial assets	341	393
Other financial assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	57	29
At amortized cost
Disclosure of detailed information about financial instruments [line items]
Financial assets	442	184
At amortized cost | Cash and cash equivalents
Disclosure of detailed information about financial instruments [line items]
Financial assets	439	184
At amortized cost | Trade receivables
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
At amortized cost | Other financial assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	3	0
At Fair Value through Profit and loss
Disclosure of detailed information about financial instruments [line items]
Financial assets	40	29
At Fair Value through Profit and loss | Cash and cash equivalents
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
At Fair Value through Profit and loss | Trade receivables
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
At Fair Value through Profit and loss | Other financial assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	40	29
At Fair Value through OCI
Disclosure of detailed information about financial instruments [line items]
Financial assets	355	393
At Fair Value through OCI | Cash and cash equivalents
Disclosure of detailed information about financial instruments [line items]
Financial assets	0	0
At Fair Value through OCI | Trade receivables
Disclosure of detailed information about financial instruments [line items]
Financial assets	341	393
At Fair Value through OCI | Other financial assets
Disclosure of detailed information about financial instruments [line items]
Financial assets	€ 14	€ 0

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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