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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Estimated Projected Benefit Payments for the Next 10 Years (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
Expected Future Benefit Payments 2020 $ 237
Expected Future Benefit Payments 2021 235
Expected Future Benefit Payments 2022 236
Expected Future Benefit Payments 2023 238
Expected Future Benefit Payments 2024 237
Expected Future Benefit Payments 2025-2029 1,176
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Expected Future Benefit Payments 2020 14
Expected Future Benefit Payments 2021 13
Expected Future Benefit Payments 2022 13
Expected Future Benefit Payments 2023 12
Expected Future Benefit Payments 2024 11
Expected Future Benefit Payments 2025-2029 $ 47