Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Taxes
Income Tax Expense (Benefit)		$ 1,253		$ 320	$ 328	$ (293)
Goodwill, Impairment Loss					1,781
Unrecognized tax benefits		938			938			$ 932
Unrecognized tax benefits that would impact effective tax rate		856			856			849
Unrecognized tax benefits, interest and penalties accrued		$ 46			$ 46			49
Effective Income Tax Rate Reconciliation, Percent		(916.50%)		72.80%	(44.40%)	(143.30%)
Deferred income taxes and other liabilities		$ 9,338			$ 9,338			9,670
Medical Unit
Income Taxes
Goodwill, Impairment Loss		474	$ 1,300		1,800
Cordis Divestiture
Income Taxes
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation		9			29
Medical Unit Goodwill Impairment [Member]
Income Taxes
Income Tax Expense (Benefit)					1,200
Medical Unit Goodwill Impairment [Member] | Subsequent Event
Income Taxes
Income Tax Expense (Benefit)	$ (180)
Forecast [Member] | Cordis Divestiture
Income Taxes
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation							$ 38
Forecast [Member] | Medical Unit Goodwill Impairment [Member]
Income Taxes
Income Tax Expense (Benefit)							$ (126)
Net Operating Loss Carryback [Member]
Income Taxes
Income Tax Expense (Benefit)						$ (419)
Deferred income taxes and other liabilities				$ 700		700
Income Taxes Receivable								974
Net Operating Loss Carryback [Member] | Subsequent Event
Income Taxes
Proceeds from Income Tax Refunds	$ 966
Minimum
Income Taxes
Estimated range of decrease in unrecognized tax benefits within the next 12 months		0			0
Maximum
Income Taxes
Estimated range of decrease in unrecognized tax benefits within the next 12 months		5			5
Patient Recovery Business
Income Taxes
Indemnification Receivable		0			0			12
CareFusion [Member]
Income Taxes
Indemnification Receivable		73			73			72
Total Opioid Litigation [Member]
Income Taxes
Estimated Litigation Liability		$ 6,700			6,700
Income Tax Expense (Benefit)					$ 0	(180)		(228)
Unrecognized tax benefits that would impact effective tax rate				$ 35		35		$ 219
Litigation Settlement, Expense						$ 1,020