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PENSIONS AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Benefit Payments Expected to be Paid Either by Pension Funds or Directly to Beneficiaries (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2021
EUR (€)
Disclosure of employee benefits [Abstract]  
2022 € 55
2023 55
2024 57
2025 57
2026 58
2027 to 2031 € 290