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Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Goodwill and Other Intangible Assets) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2022 USD ($) segment | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($)
Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Number of Operating Segments | segment |  |  |  | 2 |  |
Goodwill, Impairment Loss |  |  |  | $ 2,084 | $ 0 | $ 0
Medical Unit |  |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Discount Rate, fair value inputs | 10.00% | 9.50% | 9.00% |  |  |
Goodwill, Impairment Loss | $ 303 | $ 474 | $ 1,300 | $ 2,100 |  |
Minimum |  |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Discount Rate, fair value inputs |  |  |  | 10.00% |  |
Maximum |  |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Discount Rate, fair value inputs |  |  |  | 12.00% |  |

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