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GOODWILL AND OTHER INTANGIBLE ASSETS - Expected Expense Related to Intangibles Amortization in Future Periods (Details) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
2021 $ 5  
2022 5  
2023 3  
2024 1  
2025 1  
2026 and thereafter 3  
Net Carrying Amount $ 18 $ 15