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Pension and Other Postretirement Benefits - Schedule of Plan Assets and Grantor Trust Assets By Level (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
--- | --- | --- | ---
Trust for Benefit of Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | $ 266 | $ 276 |
Money market funds | Trust for Benefit of Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 26 | 20 |
Domestic fixed income funds | Trust for Benefit of Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 66 | 143 |
Balanced funds | Trust for Benefit of Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 53 | 112 |
Domestic government obligations | Trust for Benefit of Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 120 |  |
Other | Trust for Benefit of Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 1 | 1 |
Pension benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 891 | 853 | $ 801
Pension benefits | Money market funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 12 | 18 |
Pension benefits | Domestic equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 156 | 189 |
Pension benefits | Domestic fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 488 | 383 |
Pension benefits | International equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 118 | 136 |
Pension benefits | Balanced funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 69 | 78 |
Pension benefits | Partnership interests |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 48 | 49 |
Level 1 | Trust for Benefit of Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 266 | 276 |
Level 1 | Money market funds | Trust for Benefit of Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 26 | 20 |
Level 1 | Domestic fixed income funds | Trust for Benefit of Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 66 | 143 |
Level 1 | Balanced funds | Trust for Benefit of Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 53 | 112 |
Level 1 | Domestic government obligations | Trust for Benefit of Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 120 |  |
Level 1 | Other | Trust for Benefit of Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 1 | 1 |
Level 1 | Pension benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 843 | 804 |
Level 1 | Pension benefits | Money market funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 12 | 18 |
Level 1 | Pension benefits | Domestic equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 156 | 189 |
Level 1 | Pension benefits | Domestic fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 488 | 383 |
Level 1 | Pension benefits | International equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 118 | 136 |
Level 1 | Pension benefits | Balanced funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 69 | 78 |
Level 1 | Pension benefits | Partnership interests |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 | 0 |
Fair Value Measured at Net Asset Value Per Share | Trust for Benefit of Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 | 0 |
Fair Value Measured at Net Asset Value Per Share | Money market funds | Trust for Benefit of Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 | 0 |
Fair Value Measured at Net Asset Value Per Share | Domestic fixed income funds | Trust for Benefit of Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 | 0 |
Fair Value Measured at Net Asset Value Per Share | Balanced funds | Trust for Benefit of Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 | 0 |
Fair Value Measured at Net Asset Value Per Share | Domestic government obligations | Trust for Benefit of Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 |  |
Fair Value Measured at Net Asset Value Per Share | Other | Trust for Benefit of Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 | 0 |
Fair Value Measured at Net Asset Value Per Share | Pension benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 48 | 49 |
Fair Value Measured at Net Asset Value Per Share | Pension benefits | Money market funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 | 0 |
Fair Value Measured at Net Asset Value Per Share | Pension benefits | Domestic equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 | 0 |
Fair Value Measured at Net Asset Value Per Share | Pension benefits | Domestic fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 | 0 |
Fair Value Measured at Net Asset Value Per Share | Pension benefits | International equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 | 0 |
Fair Value Measured at Net Asset Value Per Share | Pension benefits | Balanced funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 | 0 |
Fair Value Measured at Net Asset Value Per Share | Pension benefits | Partnership interests |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | $ 48 | $ 49 |

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