Goodwill And Other Intangible Assets (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) Reporting_Unit	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Goodwill [Line Items]
Reporting units for goodwill impairment testing | Reporting_Unit	5
Goodwill	$ 35,420	$ 22,713	$ 22,581
Impairment loss	0	0	0
Adjustments due to finalization of purchase price adjustments	$ (3)	$ (7)
Finite-lived intangible assets, weighted-average life (in years)	17 years	13 years
Asset impairment charges	$ 22
Amortization of intangible assets	1,138	$ 625	$ 616
Future amortization expense, year one	1,380
Future amortization expense, year two	1,362
Future amortization expense, year three	1,357
Future amortization expense, year four	1,316
Future amortization expense, year five	1,291
Cytiva
Goodwill [Line Items]
Adjustments due to finalization of purchase price adjustments	(1,300)
Minimum
Goodwill [Line Items]
Goodwill	512
Maximum
Goodwill [Line Items]
Goodwill	$ 24,900