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Pension and Other Postretirement Benefits - Schedule of Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Jun. 30, 2023
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Pension benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actuarial losses (gains) | $ 169 | $ 229
Postretirement benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actuarial losses (gains) | $ (30) | $ (34)

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