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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, 2020
EUR (€)
Disclosure of employee benefits [Abstract]  
2021 € 49
2022 48
2023 49
2024 53
2025 52
2026 to 2030 € 275