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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Defined Benefit Pension Plans [Member]  
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
2018 $ 275
2019 275
2020 274
2021 274
2022 272
2023 through 2027 1,307
Total 2,677
Other Postretirement Benefits [Member]  
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
2018 16
2019 17
2020 17
2021 18
2022 19
2023 through 2027 79
Total $ 166