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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2021	Jun. 30, 2020
Income Taxes
Income Tax Expense (Benefit)	$ (203)	$ 59	$ (613)	$ (364)
Unrecognized tax benefits	989		989			$ 998
Unrecognized tax benefits that would impact effective tax rate	745		745			753
Unrecognized tax benefits, interest and penalties accrued	$ 150		$ 150			146
Effective Income Tax Rate Reconciliation, Percent	(47.60%)	21.00%	259.70%	7.20%
Deferred income taxes and other liabilities	$ 10,274		$ 10,274			8,594
Net Operating Loss Carryback [Member]
Income Taxes
Income Tax Expense (Benefit)	(420)
Deferred income taxes and other liabilities						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	$ 370		370
Internal Revenue Service (IRS) [Member] | Minimum
Income Taxes
Open Tax Year	2008
Patient Recovery Business
Income Taxes
Indemnification Receivable	$ 19		19			19
CareFusion [Member]
Income Taxes
Indemnification Receivable	181		181			176
Total Opioid Litigation [Member]
Income Taxes
Estimated Litigation Liability	6,590		6,590
Income Tax Expense (Benefit)	$ 150		(300)			(488)
Unrecognized tax benefits that would impact effective tax rate						$ 469
Litigation Settlement, Expense			$ 1,020	$ 5,630
Total Opioid Litigation [Member] | Forecast [Member]
Income Taxes
Income Tax Expense (Benefit)					$ (35)
Unrecognized tax benefits that would impact effective tax rate					$ 34

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