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PENSIONS AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Amounts Recognized in the Consolidated Statement of Financial Position (Details)
€ in Millions, $ in Millions
Jun. 30, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
USD ($)
Disclosure of net defined benefit liability (asset) [line items]      
Fair value of plan assets € (489) € (544)  
Net defined benefit liability 461 599 $ 599
Of which net liability 463 599  
Of which net asset (2) 0  
Funded      
Disclosure of net defined benefit liability (asset) [line items]      
Present value of obligation 629 766  
Fair value of plan assets (489) (544)  
Deficit of funded plans 140 222  
Unfunded      
Disclosure of net defined benefit liability (asset) [line items]      
Present value of obligation 321 377  
Pension Benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability 241 350  
Pension Benefits | Funded      
Disclosure of net defined benefit liability (asset) [line items]      
Present value of obligation 629 766  
Fair value of plan assets (489) (544)  
Deficit of funded plans 140 222  
Pension Benefits | Unfunded      
Disclosure of net defined benefit liability (asset) [line items]      
Present value of obligation 101 128  
Other Benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability 220 249  
Other Benefits | Funded      
Disclosure of net defined benefit liability (asset) [line items]      
Present value of obligation 0 0  
Fair value of plan assets 0 0  
Deficit of funded plans 0 0  
Other Benefits | Unfunded      
Disclosure of net defined benefit liability (asset) [line items]      
Present value of obligation € 220 € 249