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Collaborative Arrangements - Daiicho Sankyo - Narrative (Details) $ in Millions	1 Months Ended	3 Months Ended			9 Months Ended
	Aug. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Oct. 31, 2023 USD ($) candidate
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Research and development		$ 5,862		$ 3,307	$ 13,354	$ 20,904
Daiichi Sankyo | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of antibody drug conjugates obtained right and obligations | candidate							3
Aggregate upfront payments due upon execution in collaborative arrangement							$ 4,000
Refundable upfront payments in collaborative arrangement							1,000
Maximum aggregate contingent milestone payments, per product, in collaborative arrangement							$ 5,500
Research and development		$ 94	$ 5,500	$ 0	$ 227	$ 0
Sales based royalty percentage							5.00%
Upfront cash payment	$ 170
Daiichi Sankyo | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Ifinatamab Deruxtecan
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Refundable upfront payments in collaborative arrangement							$ 500
Daiichi Sankyo | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Patritumab Deruxtecan
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Refundable upfront payments in collaborative arrangement							500
Aggregate upfront payments due upon lapse of time in collaborative arrangement							750
Daiichi Sankyo | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Raludotatug Deruxtecan
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Aggregate upfront payments due upon lapse of time in collaborative arrangement							$ 750
Liable contracted portion of research and development expenses to incur costs for in collaborative arrangement, percentage							75.00%
Liable contracted portion of research and development expenses to incur costs for in collaborative arrangement							$ 2,000
Daiichi Sankyo | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Patritumab Deruxtecan And Raludotatug Deruxtecan
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Aggregate upfront payments due upon lapse of time in collaborative arrangement			$ 1,500

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