Basis of Presentation and Summary of Accounting Principles (Collaborative Arrangements) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cost of Products Sold [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaborator Share Of Sales	$ 1,183	$ 2,097	$ 1,688
Collaborator Share Of Program Costs Amount	(147)	(190)	(209)
Cost of Services Sold [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaborator Share Of Sales	1,374	1,674	1,765
Research and Development [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaborator Share Of Program Costs Amount	(177)	(219)	(225)
Selling General and Administrative [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaborator Share Of Program Costs Amount	$ (99)	$ (101)	$ (87)