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INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - EUR (€) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Goodwill | € 451,000,000 | € 417,000,000 | € 455,000,000
P&ARP |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Goodwill | 444,000,000 |  |
Carrying value | 1,500,000,000 |  |
Recoverable value | 2,000,000,000 |  |
Goodwill impairment | € 0 |  |
Cash flow rates | 40.00% |  |
P&ARP | Bottom of range |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Discount rate to estimate normative cash flows | 9.00% |  |
P&ARP | Top of range |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Long term growth rate used to estimate normative cash flow | 1.50% |  |
A&T |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Goodwill | € 5,000,000 |  |
Long term growth rate used to estimate normative cash flow |  | 1.50% |
Discount rate to estimate normative cash flows |  | 9.00% |
AS&I |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Goodwill | € 2,000,000 |  |
Discount rate to estimate normative cash flows |  | 9.00% |

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