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Quarterly Operating Results (unaudited) (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
	Aug. 01, 2020	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Data [Line Items]
Amortization of intangible assets		$ 26	$ 27	$ 25	$ 25	$ 24	$ 23	$ 25	$ 24	$ 103	$ 96	$ 90
Restructuring and integration charges		15	18	9	16	14	16	26	22
Pre-tax charges due to COVID-19		20	69		9
Share-based compensation, excess tax benefit, amount		8	3	4	8	2	3	5	3	$ 23	13	$ 18
Pre-tax gain (loss) due to COVID-19				(26)
Income recognized due to receipt of initial tranche of funds from the CARES Act				65
Reversal of income recognized due to receipt of initial tranche of funds from the CARES Act			65
Gain recognized by an equity method investee to adjust certain of its investments to fair value, partially offset by a loss on retirement of debt		2
Gain associated with an insurance claim for hurricane									8
Cost incurred do to incident							3
Gain from sale and leaseback of property						72
NID
Quarterly Financial Data [Line Items]
Gain on settling uncertain tax benefits								20			(20)
Mid America Clinical Laboratories, LLC (MACL)
Quarterly Financial Data [Line Items]
Equity interest in acquiree, remeasurement gain			$ 70
Percentage of voting interests acquired	56.00%		56.00%
Cost of Sales
Quarterly Financial Data [Line Items]
Restructuring and integration charges			$ 11			6	7	11	11
Pre-tax charges due to COVID-19		19
Selling, General and Administrative Expenses
Quarterly Financial Data [Line Items]
Restructuring and integration charges			7			8	9	15	11
Pre-tax charges due to COVID-19		2
Other Operating Income (Expense)
Quarterly Financial Data [Line Items]
Pre-tax charges due to COVID-19		1
Cost of Sales
Quarterly Financial Data [Line Items]
Restructuring and integration charges		6		3	7
Pre-tax charges due to COVID-19			3		1
Pre-tax gain (loss) due to COVID-19				(34)
Selling, General and Administrative Expenses
Quarterly Financial Data [Line Items]
Restructuring and integration charges		9		6	9
Pre-tax charges due to COVID-19					3
Pre-tax gain (loss) due to COVID-19				(5)
Gain recognized by an equity method investee to adjust certain of its investments to fair value, partially offset by a loss on retirement of debt		(2)
Gain associated with an insurance claim for hurricane									(1)
Cost incurred do to incident							4
Gain from sale and leaseback of property						(1)
Other Operating Income (Expense)
Quarterly Financial Data [Line Items]
Pre-tax charges due to COVID-19			65		5
Pre-tax gain (loss) due to COVID-19				62
Gain associated with an insurance claim for hurricane									9
Contingent consideration arrangements								6
Cost incurred do to incident							7
Gain from sale and leaseback of property						73					$ (73)
Other Income (Expense)
Quarterly Financial Data [Line Items]
Gain recognized by an equity method investee to adjust certain of its investments to fair value, partially offset by a loss on retirement of debt		(10)
Other Income (Expense) | Mid America Clinical Laboratories, LLC (MACL)
Quarterly Financial Data [Line Items]
Equity interest in acquiree, remeasurement gain	$ 70
Intangible Assets
Quarterly Financial Data [Line Items]
Amortization of intangible assets		28	30	28	28	27	25	30	29
Equity in Earnings of Equity Method Investees
Quarterly Financial Data [Line Items]
Amortization of intangible assets		2	3	3	$ 3	$ 3	$ 2	$ 5	$ 5
Pre-tax charges due to COVID-19		(2)	$ 1
Pre-tax gain (loss) due to COVID-19				$ 3
Gain recognized by an equity method investee to adjust certain of its investments to fair value, partially offset by a loss on retirement of debt		$ 14

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