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Collaboration Agreements and Research and Development Funding Arrangement (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Mar. 31, 2024	Oct. 31, 2022
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Research and development	$ 1,221	$ 1,148	$ 2,284	$ 2,279
Merck | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Cash proceeds						$ 250
Research and development	95	50	171	69
Recovery of costs	$ 33	$ 12	$ 57	$ 18
Blackstone Life Sciences (Blackstone) | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Funding amount					$ 750
Milestone payments					$ 750

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+ References

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- Definition

Collaborative Arrangement, Rights and Obligations, Maximum Aggregate Milestone Payments, Per Product

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 20
-Name Accounting Standards Codification
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Amount of expense for research and development. Includes, but is not limited to, cost for computer software product to be sold, leased, or otherwise marketed and writeoff of research and development assets acquired in transaction other than business combination or joint venture formation or both. Excludes write-down of intangible asset acquired in business combination or from joint venture formation or both, used in research and development activity.

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