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POSTRETIREMENT BENEFIT PLANS - Pension Benefits and Retiree Health and Life Benefits (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
category
Defined Benefit Plan Disclosure [Line Items]  
Number of categories | category 3
Other pension  
Defined Benefit Plan Disclosure [Line Items]  
Assets or obligations of U.S. and non-U.S. pension plans (greater than) | $ $ 50,000,000