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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Plant and Equipment (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Property, Plant and Equipment          
Property, plant and equipment, Gross $ 5,042   $ 5,042   $ 4,831
Less accumulated depreciation and amortization (2,956)   (2,956)   (2,763)
Property, plant and equipment, net 2,086   2,086   2,068
Cost of assets related to projects in progress 503   503   474
Depreciation and amortization of property, plant and equipment 127 $ 121 252 $ 237  
Land          
Property, Plant and Equipment          
Property, plant and equipment, Gross 29   29   29
Buildings and improvements          
Property, Plant and Equipment          
Property, plant and equipment, Gross 367   $ 367   337
Buildings and improvements | Minimum          
Property, Plant and Equipment          
Property, plant and equipment, Useful life (in years)     10 years    
Buildings and improvements | Maximum          
Property, Plant and Equipment          
Property, plant and equipment, Useful life (in years)     40 years    
Machinery and equipment          
Property, Plant and Equipment          
Property, plant and equipment, Gross 836   $ 836   811
Machinery and equipment | Minimum          
Property, Plant and Equipment          
Property, plant and equipment, Useful life (in years)     3 years    
Machinery and equipment | Maximum          
Property, Plant and Equipment          
Property, plant and equipment, Useful life (in years)     10 years    
Computer hardware and software          
Property, Plant and Equipment          
Property, plant and equipment, Gross 1,308   $ 1,308   1,264
Computer hardware and software | Minimum          
Property, Plant and Equipment          
Property, plant and equipment, Useful life (in years)     4 years    
Computer hardware and software | Maximum          
Property, Plant and Equipment          
Property, plant and equipment, Useful life (in years)     10 years    
Furniture and fixtures          
Property, Plant and Equipment          
Property, plant and equipment, Gross 117   $ 117   116
Furniture and fixtures | Minimum          
Property, Plant and Equipment          
Property, plant and equipment, Useful life (in years)     5 years    
Furniture and fixtures | Maximum          
Property, Plant and Equipment          
Property, plant and equipment, Useful life (in years)     10 years    
Leasehold improvements          
Property, Plant and Equipment          
Property, plant and equipment, Gross $ 2,385   $ 2,385   $ 2,274