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Pension and Other Postretirement Benefits - Schedule of Amounts Recognized in Balance Sheets (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Jun. 30, 2021
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Defined Benefit Plan Disclosure [Line Items] |  |
Net amount recognized | $ 461 |
Pension benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension assets | 6 | $ 4
Accrued pension liabilities | (408) | (500)
Net amount recognized | (402) | (496)
Postretirement benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension assets | 0 | 0
Accrued pension liabilities | (53) | (98)
Net amount recognized | $ (53) | $ (98)

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