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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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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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