Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Taxes
Income Tax Expense (Benefit)	$ 320	$ 127	$ (293)	$ (237)
Unrecognized tax benefits	785		785			$ 998
Unrecognized tax benefits that would impact effective tax rate	703		703			753
Unrecognized tax benefits, interest and penalties accrued	$ 73		$ 73			146
Effective Income Tax Rate Reconciliation, Percent	72.80%	26.80%	(143.30%)	5.20%
Deferred income taxes and other liabilities	$ 10,042		$ 10,042			8,594
Net Operating Loss Carryback [Member]
Income Taxes
Income Tax Expense (Benefit)			(419)
Deferred income taxes and other liabilities	700		700
Income Taxes Receivable	974		974
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	90		$ 90
Internal Revenue Service (IRS) [Member] | Minimum
Income Taxes
Open Tax Year			2011
Patient Recovery Business
Income Taxes
Indemnification Receivable	19		$ 19			19
CareFusion [Member]
Income Taxes
Indemnification Receivable	119		119			176
Total Opioid Litigation [Member]
Income Taxes
Estimated Litigation Liability	6,590		6,590
Income Tax Expense (Benefit)	$ 140		(180)			(488)
Unrecognized tax benefits that would impact effective tax rate						$ 468
Litigation Settlement, Expense			$ 1,020	$ 5,630
Total Opioid Litigation [Member] | Forecast [Member]
Income Taxes
Income Tax Expense (Benefit)					$ (37)
Unrecognized tax benefits that would impact effective tax rate					$ 35