Fair Value Measurements - Carrying and Fair Value of Long-Term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2026	Jun. 30, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt with fixed interest rates (excluding commercial paper and finance leases)	$ 12,503	$ 12,174
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt with fixed interest rates (excluding commercial paper and finance leases)	$ 12,525	$ 12,213

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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