PENSION AND POST-RETIREMENT BENEFIT PLANS - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Pension Plans | U.S.
Components of net periodic benefit cost:
Service cost	$ 9	$ 10	$ 29	$ 28
Interest cost	9	10	26	28
Expected return on plan assets	(14)	(15)	(40)	(41)
Amortization of:
Actuarial loss	5	3	12	8
Special termination benefits	0	0	0	0
Net periodic benefit cost	9	8	27	23
Employer contributions			30
Pension Plans | International
Components of net periodic benefit cost:
Service cost	9	8	27	23
Interest cost	3	3	8	9
Expected return on plan assets	(4)	(3)	(11)	(10)
Amortization of:
Actuarial loss	1	0	4	2
Special termination benefits	1	0	1	0
Net periodic benefit cost	10	8	29	24
Employer contributions			11
Other than Pension Plans Post-retirement
Components of net periodic benefit cost:
Service cost	0	1	2	2
Interest cost	2	2	5	6
Expected return on plan assets	0	(1)	(1)	(2)
Amortization of:
Actuarial loss	0	0	0	0
Special termination benefits	0	0	0	0
Net periodic benefit cost	$ 2	$ 2	$ 6	$ 6