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EMPLOYEE BENEFIT PLANS (Retirement Income Plan's Assets Carried at Fair Value) (Details) - Retirement Income [Member] - Retirement Income [Member] - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value $ 507 $ 485 $ 420
Fair Value, Inputs, Level 1 and 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 3 2  
Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 3 2  
Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0 0  
Fair Value Measured at Net Asset Value Per Share [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 504 483  
Cash equivalents [Member] | Fair Value, Inputs, Level 1 and 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 3 2  
Cash equivalents [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 3 2  
Cash equivalents [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0 0  
Bond funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 444 393  
International equity funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 36 50  
Domestic equity funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 23 39  
Real estate fund [Member] | Fair Value Measured at Net Asset Value Per Share [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value $ 1 $ 1