Acquisitions (Narrative) (Details) $ / shares in Units, $ in Millions				12 Months Ended
	Apr. 30, 2020 USD ($) $ / shares	Mar. 31, 2020 USD ($)	Apr. 13, 2018 USD ($)	Dec. 31, 2020 USD ($) Business Businesses $ / shares	Dec. 31, 2019 USD ($) Business	Dec. 31, 2018 USD ($) Business
Business Acquisition [Line Items]
Pension liabilities assumed				$ 423	$ 0	$ 0
Proceeds from sale of product lines	$ 826			826	0	0
Gain on sale of product lines	455			455	0	0
Gain on sale of product lines, net of tax	$ 305			$ 305
Gain on sale of product lines, net of tax, per diluted common share | $ / shares	$ 0.42			$ 0.42
Certain product lines, revenues					170
Goodwill				$ 10,402	$ 217	1,276
Number of businesses acquired				5	5
Net cash consideration				$ 20,971	$ 331	2,173
Number of segments | Business				3	3
Revenue reported by acquired entity for last annual period				$ 3,300	$ 72
Cytiva
Business Acquisition [Line Items]
Consideration transferred		$ 20,700
Acquired cash		100
Pension liabilities assumed		400		423
Proceeds from underwritten public offerings of common stock and mandatory convertible preferred stock series A					3,000
Proceeds from issuance of debt		10,800
Proceeds from commercial paper borrowings, borrowings under the Five Year Facility and cash on hand		$ 6,900
Goodwill				10,171
Net cash consideration				20,715
Transaction costs				59	$ 93
IDT
Business Acquisition [Line Items]
Goodwill			$ 1,200			1,213
Net cash consideration			2,100			2,078
Revenue reported by acquired entity for last annual period			$ 260
Other businesses acquired
Business Acquisition [Line Items]
Pension liabilities assumed				0
Goodwill				$ 231		$ 63
Number of businesses acquired				4		1
Net cash consideration				$ 256		$ 95
Revenue reported by acquired entity for last annual period						53
Fair value adjustment to inventory | Cytiva
Business Acquisition [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest				$ 509
Fair value adjustment to inventory | IDT
Business Acquisition [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest						1
Acquisition-related costs | IDT
Business Acquisition [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest						$ 15