Retirement Benefits - Schedule of Defined Benefit Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Pension Plan | United States
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 28	$ 29	$ 35
Interest cost	184	190	165
Expected return on plan assets	(245)	(258)	(238)
Amortization of prior service cost	3	1	1
Amortization of net actuarial loss (gain)	7	2	8
Settlements	3	0	0
Divestitures	0	0	0
Net periodic benefit cost (credit)	(20)	(36)	(29)
Pension Plan | Non-U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	22	22	23
Interest cost	76	80	60
Expected return on plan assets	(87)	(95)	(73)
Amortization of prior service cost	0	0	0
Amortization of net actuarial loss (gain)	7	6	9
Settlements	0	0	0
Divestitures	0	0	(3)
Net periodic benefit cost (credit)	18	13	16
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost	4	4	3
Expected return on plan assets	0	0	0
Amortization of prior service cost	0	0	0
Amortization of net actuarial loss (gain)	(2)	(2)	(1)
Settlements	0	0	0
Divestitures	0	0	0
Net periodic benefit cost (credit)	$ 2	$ 2	$ 2