Goodwill and Other Intangible Assets (Narrative) (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) reportingUnit	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Oct. 01, 2022 USD ($)	Sep. 30, 2022 USD ($)
Goodwill [Line Items]
Reporting units | reportingUnit	5
Goodwill	$ 41,608,000,000	$ 37,276,000,000	$ 38,682,000,000		$ 35,850,000,000
Impairment loss	$ 0	$ 0	0
Finite-lived intangible assets, weighted-average life (in years)	14 years	12 years
Asset impairment charges	$ 77,000,000	$ 0	10,000,000
Amortization of intangible assets	1,491,000,000	1,434,000,000	1,388,000,000
Estimated amortization expense, 2024	1,600,000,000
Estimated amortization expense, 2025	1,600,000,000
Estimated amortization expense, 2026	1,600,000,000
Estimated amortization expense, 2027	1,500,000,000
Estimated amortization expense, 2028	1,500,000,000
Operating segments | Biotechnology
Goodwill [Line Items]
Goodwill	22,477,000,000	$ 22,087,000,000	$ 0	$ 21,000,000,000	$ 0
Minimum
Goodwill [Line Items]
Goodwill	1,200,000,000
Maximum
Goodwill [Line Items]
Goodwill	$ 21,600,000,000