Share-Based Compensation and Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Retirement Benefits [Abstract]
Share-based compensation expense	$ 136	$ 150	$ 241	$ 275
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	26	52	63	109
Other Retiree Benefits
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	$ (180)	$ (156)	$ (360)	$ (311)