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EMPLOYEE BENEFITS - Narrative (Details) - USD ($)
12 Months Ended
Sep. 07, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Years of service used in determining benefits   5 years      
Net actuarial loss recorded in AOCI expected to be recognized during 2017   $ 18,000,000      
401(k) Plan          
Employer matching contribution, time of service required   1 year      
Employer matching contribution percentage     100.00%   100.00%
Employer matching contribution, Percent of employees' pay     4.00% 5.00% 5.00%
Employer matching contribution, addition   2.00%      
Employer contribution amount   $ 55,000,000 $ 52,000,000 $ 60,000,000  
Qualified Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Net actuarial losses   634,000,000      
Employer contributions $ 75,000,000 75,000,000 $ 100,000,000    
Expected 2017 contribution   $ 0      
Discount rate   4.19% 4.64% 4.125%  
Non-Qualified Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Net actuarial losses     $ 599,000,000    
Employer contributions   $ 8,000,000 $ 9,000,000    
Expected 2017 contribution   $ 8,000,000      
Discount rate   4.05% 4.54% 3.875%  
Postretirement Benefit Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Expected 2017 contribution   $ 2,000,000      
Discount rate   3.53% 3.93%    
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]          
Assumed annual rate of increase in the per capita cost of covered health care benefits   7.00% 7.00%    
Ultimate health care cost trend rate   5.00% 5.00%