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PENSIONS AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Narrative (Details) - EUR (€)
€ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]          
Reduction in defined benefit liability for negative past service costs     € 36 € (2) € 1
Weighted-average maturity of defined benefit obligations       14 years 2 months 12 days 14 years 1 month 6 days
Pension Benefits          
Disclosure of defined benefit plans [line items]          
Expected contributions to pension and other benefits for next year       € 24  
Other Benefits          
Disclosure of defined benefit plans [line items]          
Reduction in defined benefit liability for negative past service costs € 3 € 2   2  
Expected contributions to pension and other benefits for next year       € 15  
Actuarial assumption of discount rates          
Disclosure of defined benefit plans [line items]          
Increase in actuarial assumption 0.50%     0.50%