Share-Based Compensation and Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Retirement Benefits [Abstract]
Share-based compensation expense	$ 140	$ 136	$ 262	$ 241
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	26	26	65	63
Other Retiree Benefits
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	$ (149)	$ (180)	$ (302)	$ (360)