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GOODWILL AND INTANGIBLE ASSETS - Intangible Asset Amortization (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]  
2021 $ 10
2022 9
2023 9
2024 8
2025 $ 7