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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - FUTURE BENEFIT PAYMENTS (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure  
Expected contribution to defined benefit pension plans during 2017 $ 5
Estimated future benefit payments  
2018 47
2019 30
2020 30
2021 31
2022 30
2023 - 2027 181
Postretirement Benefits  
Estimated future benefit payments  
2018 60
2019 59
2020 59
2021 59
2022 58
2023 - 2027 $ 286