Share-Based Compensation and Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Retirement Benefits [Abstract]
Share-based compensation expense	$ 132	$ 123	$ 394	$ 364
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	27	29	93	92
Other Retiree Benefits
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	$ (153)	$ (180)	$ (456)	$ (541)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details