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PERSONNEL EXPENSES AND DEFERRED EMPLOYEE BENEFITS - Other Post-Employment Benefits - Narrative (Details) - Net periodic OPEB cost - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2021
Apr. 30, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]      
Gain on plan amendment and curtailment     $ (3)
Poland      
Disclosure of defined benefit plans [line items]      
Defined benefit plan transition period   10 years  
Gain on plan amendment and curtailment $ 51,000