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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Defined Benefit Pension Plans  
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2019 $ 1,549
2020 1,559
2021 1,585
2022 1,624
2023 1,663
2024-2028 8,641
Total 16,621
Other Postretirement Benefits  
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2019 133
2020 129
2021 129
2022 125
2023 120
2024-2028 519
Total $ 1,155