DEBT (Long-term Debt, Net of Unamortized Discounts or Premiums) (Details) - USD ($)	Jun. 30, 2020	May 31, 2020	Jun. 30, 2019	Jun. 30, 2018	May 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Jun. 30, 2016
Debt Instrument [Line Items]
Long-term debt	$ 2,780,000,000		$ 2,287,000,000
Less: Current maturities of long-term debt	0		0
Long-term debt, noncurrent	$ 2,780,000,000		2,287,000,000	$ 2,284,000,000			$ 1,391,000,000	$ 1,789,000,000
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	$ 299,000,000		299,000,000
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	$ 599,000,000		598,000,000
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	$ 498,000,000		498,000,000
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		397,000,000
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	$ 496,000,000		495,000,000
Senior Long-Term Notes And Debentures; 1.80%, $500 Due May 2030
Debt Instrument [Line Items]
Annual fixed interest rate	1.80%	1.80%
Face value	$ 500,000,000	$ 500,000,000
Long-term debt	$ 491,000,000		$ 0