Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended					6 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 63			$ 71		$ 127	$ 142
Estimated annual amortization of intangible assets - Remainder of Fiscal Year	127					127
Estimated annual amortization of intangible assets - Year One	226					226
Estimated annual amortization of intangible assets - Year Two	206					206
Estimated annual amortization of intangible assets - Year Three	174					174
Estimated annual amortization of intangible assets - Year Four	148					148
Goodwill [Line Items]
Goodwill	4,024		$ 4,609			4,024
Goodwill impairment						581
Medical
Goodwill [Line Items]
Goodwill	$ 1,375		$ 1,960			1,375
Goodwill impairment				$ 709	$ 154	581
Medical Unit
Goodwill [Line Items]
Goodwill impairment						$ 581	$ 863
Discount Rate, Fair Value Input		11.00%	10.00%
Terminal Growth Rate, Fair Value Input	2.00%	2.00%	2.00%			2.00%
Change in Discount Rate, Fair Value Input						1.00%