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Pension and Other Postretirement Benefits - Funded and Unfunded Pension Plans (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2020
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Grantor Trust assets | $ 270 | $ 304 |
Pension benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net amounts recognized | 1,203 | 1,468 | $ 1,409
Accumulated benefit obligation | 1,069 | 1,319 |
Fair value of plan assets | 801 | 972 | $ 788
Grantor Trust assets | 270 | 304 |
Funded Plans | Pension benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net amounts recognized | 930 | 1,150 |
Accumulated benefit obligation | 801 | 1,010 |
Fair value of plan assets | 801 | 972 |
Unfunded Plans | Pension benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net amounts recognized | 273 | 318 |
Accumulated benefit obligation | 268 | 309 |
Fair value of plan assets | $ 0 | $ 0 |

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- Definition The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(b)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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