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RETIREMENT MEDICAL PLANS - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 23, 2019
Sep. 08, 2017
Sep. 30, 2019
Sep. 30, 2017
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Health care cost trend rate (weighted average)     6.36%   6.36%  
Net actuarial loss estimated to be amortized from accumulated other comprehensive loss     $ (14,000,000)   $ (14,000,000)  
The prior service benefit estimated to be amortized from accumulated other comprehensive loss to periodic benefits cost     36,000,000   $ 36,000,000  
Postemployment Retirement Benefits            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Annual defined contribution per retiree $ 3,000 $ 4,000        
Average remaining service period of active participants   7 years        
Prior service credit to be amortized     $ 15,000,000 $ 315,000,000    
Average period of amortization, inactive plan participants 9 years 9 years        
Annual decrease in contribution $ 600          
U.S. Retiree Medical Plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Average period of amortization, inactive plan participants         9 years  
Health care cost trend rate (weighted average)     6.36% 6.52% 6.36% 6.18%