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GOODWILL AND INTANGIBLE ASSETS - Intangible Asset Amortization (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]  
2019 $ 5
2020 5
2021 4
2022 3
2023 $ 3