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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Estimated Projected Benefit Payments for the Next 10 Years (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
Expected Future Benefit Payments in 2018 $ 369
Expected Future Benefit Payments in 2019 371
Expected Future Benefit Payments in 2020 374
Expected Future Benefit Payments in 2021 374
Expected Future Benefit Payments in 2022 376
Expected Future Benefit Payments in 2023-2027 1,902
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Expected Future Benefit Payments in 2018 19
Expected Future Benefit Payments in 2019 18
Expected Future Benefit Payments in 2020 17
Expected Future Benefit Payments in 2021 16
Expected Future Benefit Payments in 2022 15
Expected Future Benefit Payments in 2023-2027 $ 65