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BASIS OF PRESENTATION (Pension Benefit Guaranty Corporation Agreement) (Details)
$ in Millions
Mar. 18, 2016
Aug. 31, 2018
USD ($)
property
Aug. 30, 2018
property
Mar. 31, 2018
USD ($)
Mar. 14, 2018
property
Nov. 30, 2017
property
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Number of properties released under amendment         138 138
Pension Benefit Guaranty Corporation            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Pension plan protection term 5 years          
Subsequent Event            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Number of properties released under amendment   12        
Number of properties released under amendment that provided funds for required deposit     1      
Pension Plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Escrow deposit | $       $ 125    
Pension Plan | Subsequent Event            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Escrow deposit | $   $ 32