Retirement Benefits - Schedule of Information for Pension Plans with Projected Benefit Obligations in Excess of Plan Assets (Details) - Pension Plan - USD ($) $ in Millions	Jun. 30, 2026	Jun. 30, 2025
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 301	$ 3,865
Fair value of plan assets	$ 102	$ 3,665

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