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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Additional Information) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
instrument
Jun. 30, 2017
USD ($)
instrument
Jun. 30, 2016
instrument
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Performance period for performance awards   3 years    
Minimum percentage for calculating the amortization of actuarial gains and losses under the corridor approach   5.00%    
Allowance for doubtful accounts   $ 7 $ 3  
Nontrade receivables, current   $ 10 $ 3  
Number of hedging instruments designated as fair value hedges | instrument   0 0 0
Tax Cuts And Jobs Act Of 2017, provisional income tax benefit $ 81      
Excess tax benefits   $ 19 $ 22