Income Taxes - Schedule of Differences Comprising the Net Deferred Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Retirement benefits	$ 27	$ 124
Other liabilities and reserves	189	214
Long-term contracts	41	45
Stock-based compensation	38	34
Loss carryforwards	114	1,064
Inventory	70	68
Capitalized research and development	172	146
Tax credit carryforwards	45	36
Unrealized currency exchange gains and losses	5	(18)
Undistributed foreign earnings	(32)	(30)
Depreciation and amortization	(1,748)	(2,104)
Valuation allowance	(141)	(1,070)
Net deferred tax (liability)	(1,220)	(1,491)
Change in net deferred tax (liability):
Provision for deferred tax	304	(32)	$ (92)
Items of other comprehensive (loss) income	(44)	(24)
Acquisitions and other	11	133
Total change in net deferred tax	$ 271	$ 77