Nature of Operations and Summary of Significant Accounting Policies - Inventories (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Oct. 02, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials		$ 2,057	$ 2,405
Work in process		705	660
Finished goods		2,326	2,569
Inventories		5,088	5,634
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Inventories		5,088	5,634
Product revenues
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of goods and services sold		$ (13,168)	$ (14,247)	$ (13,594)
Change in Accounting Principle, Other
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Inventories	$ 33
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of LIFO inventory					5.00%
Inventories	33
Change in Accounting Principle, Other | Product revenues
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of goods and services sold	33
Change in Accounting Principle, Other | Laboratory Products and Biopharma Services
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Inventories	20
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Inventories	20
Change in Accounting Principle, Other | Laboratory Products and Biopharma Services | Product revenues
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of goods and services sold	20
Change in Accounting Principle, Other | Specialty Diagnostics
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Inventories	13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Inventories	13
Change in Accounting Principle, Other | Specialty Diagnostics | Product revenues
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of goods and services sold	$ 13