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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, Expected Future Benefit Payment [Abstract]  
2018 $ 1,471
2019 1,502
2020 1,533
2021 1,571
2022 1,612
2023 through 2027 8,517
Total 16,206
Other Postretirement Benefits [Member]  
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2018 126
2019 117
2020 118
2021 117
2022 115
2023 through 2027 527
Total $ 1,120