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EMPLOYEE RETIREMENT PLANS - Benefits Expected to be Paid in Each of the Next Five Years, and in Aggregate for the Five Years Thereafter (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Qualified  
Benefits expected to be paid in each of the next five years, and in aggregate for the five years thereafter  
2016 $ 49
2017 50
2018 51
2019 52
2020 53
2021-2025 280
Non-Qualified  
Benefits expected to be paid in each of the next five years, and in aggregate for the five years thereafter  
2016 12
2017 12
2018 12
2019 12
2020 12
2021-2025 $ 58