Acquisitions (Narrative) (Details) $ / shares in Units, $ in Millions			3 Months Ended		12 Months Ended
	Apr. 30, 2020 USD ($) $ / shares	Mar. 31, 2020 USD ($)	Apr. 02, 2021 USD ($) Business	Apr. 03, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Number of businesses acquired | Business			6
Net cash consideration			$ 419	$ 20,735
Number of segments reported | Business			3
Revenue reported by acquired entity for last annual period			$ 55
Proceeds from sale of product lines	$ 826		26	0
Pretax gain on sale of product lines	455		13	0
Gain on sale of product lines, net of tax	$ 305		10
Gain on sale of product lines, net of tax, per diluted common share | $ / shares	$ 0.42
Disposal group, product lines, revenues					$ 88	$ 170
Cytiva
Business Acquisition [Line Items]
Consideration transferred		$ 20,700
Cash acquired		100
Pension liabilities		$ 400
Cytiva | Fair value adjustment to inventory
Business Acquisition [Line Items]
Pro forma earnings, adjustments			$ 46
Cytiva | Acquisition-related transaction costs
Business Acquisition [Line Items]
Pro forma earnings, adjustments				$ 59