DEBT (Long-term Debt, Net of Unamortized Discounts or Premiums) (Details) - USD ($)	Jun. 30, 2018	May 31, 2018	Oct. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Debt Instrument [Line Items]
Long-term debt	$ 2,284,000,000				$ 1,791,000,000
Less: Current maturities of long-term debt	0				(400,000,000)
Long-term debt, noncurrent	$ 2,284,000,000				1,391,000,000	$ 1,789,000,000	$ 1,786,000,000	$ 1,588,000,000
Senior Long-Term Notes And Debentures; 5.95%, $400 Due October 2017 [Member]
Debt Instrument [Line Items]
Annual fixed interest rate	5.95%		5.95%
Face value	$ 400,000,000
Long-term debt	$ 0				400,000,000
Senior Long-Term Notes and Debentures; 3.80%, $300 Due November 2021 [Member]
Debt Instrument [Line Items]
Annual fixed interest rate	3.80%
Face value	$ 300,000,000
Long-term debt	$ 298,000,000				298,000,000
Senior Long-Term Notes and Debentures; 3.05%, $600 Due September 2022 [Member]
Debt Instrument [Line Items]
Annual fixed interest rate	3.05%
Face value	$ 600,000,000
Long-term debt	$ 597,000,000				596,000,000
Senior Long-Term Notes and Debentures; 3.50%, $500 Due December 2024 [Member]
Debt Instrument [Line Items]
Annual fixed interest rate	3.50%
Face value	$ 500,000,000
Long-term debt	$ 497,000,000				497,000,000
Senior Long-Term Notes And Debentures; 3.10%, $400 Due October 2027 [Member]
Debt Instrument [Line Items]
Annual fixed interest rate	3.10%			3.10%
Face value	$ 400,000,000			$ 400,000,000
Long-term debt	$ 397,000,000				0
Senior Long-Term Notes And Debentures; 3.90%, $500 Due May 2028 [Member]
Debt Instrument [Line Items]
Annual fixed interest rate	3.90%	3.90%
Face value	$ 500,000,000	$ 500,000,000
Long-term debt	$ 495,000,000				$ 0