Share-Based Compensation and Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Retirement Benefits [Abstract]
Share-based compensation expense	$ 123	$ 158	$ 364	$ 433
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	29	52	92	160
Other Retiree Benefits
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	$ (180)	$ (156)	$ (541)	$ (467)