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Collaborative Arrangements - Eisai Co., Ltd. (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Cost of sales	$ 3,745		$ 4,024		$ 7,285	$ 7,951
Selling, general and administrative	2,739		2,702		5,221	5,182
Research and development	3,500		13,321		7,492	17,597
Other current assets	38,205				38,205		$ 32,168
Accrued and other current liabilities	14,712				14,712		15,766
Eisai
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Amortization of intangible assets		$ 81		$ 72
Eisai | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue from collaborative arrangement	249		242		504	474
Cost of sales	60		57		121	183
Selling, general and administrative	41		48		80	99
Research and development	6		$ 17		13	$ 56
Other current assets	245				245		226
Accrued and other current liabilities	$ 0				$ 0		$ 125

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