Retirement Benefits - Schedule of Change in Benefit Obligation and Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Change in plan assets
Funded status	$ 5,646	$ 5,366
Amounts recognized on the Consolidated Balance Sheet
Pensions and other postretirement benefits	(267)	(437)
Pension Plan
Change in benefit obligation
Settlements	(55)	0
Pension Plan | United States
Change in benefit obligation
Benefit obligation at beginning of year	3,723	4,008
Service cost	28	29	$ 35
Interest cost	184	190	165
Acquisition	0	0
Actuarial gain	(12)	(106)
Benefits paid	(254)	(414)
Plan amendments	1	16
Foreign currency translation and other	0	0
Benefit obligation at end of year	3,615	3,723	4,008
Change in plan assets
Fair value of plan assets at beginning of year	3,363	3,548
Actual return on plan assets	347	179
Employer contributions	62	50
Benefits paid	(254)	(414)
Settlements	(55)	0
Foreign currency translation and other	0	0
Fair value of plan assets at end of year	3,463	3,363	3,548
Funded status	(152)	(360)
Amounts recognized on the Consolidated Balance Sheet
Other assets	0	0
Other accrued liabilities	(11)	(63)
Pensions and other postretirement benefits	(141)	(297)
Net amount recognized	(152)	(360)
Pre-tax amounts recognized in Accumulated Other Comprehensive Loss
Net actuarial loss (gain)	191	315
Prior service cost	18	20
Net amount recognized	209	335
Pension Plan | Non-U.S. Pension Benefits
Change in benefit obligation
Benefit obligation at beginning of year	1,817	1,828
Service cost	22	22	23
Interest cost	76	80	60
Acquisition	0	0
Actuarial gain	(104)	(6)
Benefits paid	(88)	(81)
Settlements	(6)	0
Plan amendments	0	0
Foreign currency translation and other	168	(26)
Benefit obligation at end of year	1,885	1,817	1,828
Change in plan assets
Fair value of plan assets at beginning of year	2,003	1,907
Actual return on plan assets	0	98
Employer contributions	87	105
Benefits paid	(88)	(81)
Settlements	(6)	0
Foreign currency translation and other	187	(26)
Fair value of plan assets at end of year	2,183	2,003	1,907
Funded status	298	186
Amounts recognized on the Consolidated Balance Sheet
Other assets	346	244
Other accrued liabilities	(1)	(2)
Pensions and other postretirement benefits	(47)	(56)
Net amount recognized	298	186
Pre-tax amounts recognized in Accumulated Other Comprehensive Loss
Net actuarial loss (gain)	230	233
Prior service cost	2	2
Net amount recognized	232	235
Other Postretirement Benefits
Change in benefit obligation
Benefit obligation at beginning of year	71	79
Service cost	0	0	0
Interest cost	4	4	3
Acquisition	0	0
Actuarial gain	(6)	(5)
Benefits paid	(6)	(7)
Settlements	0	0
Plan amendments	0	0
Foreign currency translation and other	0	0
Benefit obligation at end of year	63	71	79
Change in plan assets
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	6	7
Benefits paid	(6)	(7)
Settlements	0	0
Foreign currency translation and other	0	0
Fair value of plan assets at end of year	0	0	$ 0
Funded status	(63)	(71)
Amounts recognized on the Consolidated Balance Sheet
Other assets	0	0
Other accrued liabilities	(6)	(7)
Pensions and other postretirement benefits	(57)	(64)
Net amount recognized	(63)	(71)
Pre-tax amounts recognized in Accumulated Other Comprehensive Loss
Net actuarial loss (gain)	(25)	(20)
Prior service cost	0	0
Net amount recognized	$ (25)	$ (20)