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EMPLOYEE BENEFITS - Expected Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Qualified and Non-Qualified Plans  
Expected benefit payments by fiscal year ended  
December 31, 2016 $ 61
December 31, 2017 62
December 31, 2018 62
December 31, 2019 63
December 31, 2020 64
December 31, 2021 - 2025 337
Postretirement Benefit Plan  
Expected benefit payments by fiscal year ended  
December 31, 2016 1
December 31, 2017 1
December 31, 2018 1
December 31, 2019 1
December 31, 2020 1
December 31, 2021 - 2025 $ 5