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Collaborative Arrangements - Eisai Co., Ltd. (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Cost of sales	$ 3,557	$ 3,745	$ 6,976	$ 7,285
Selling, general and administrative	2,649	2,739	5,202	5,221
Research and development	4,048	3,500	7,669	7,492
Other current assets	37,065		37,065		$ 38,782
Eisai | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue from collaborative arrangement	265	249	523	504
Cost of sales	60	60	121	121
Selling, general and administrative	35	41	66	80
Research and development	3	$ 6	7	$ 13
Other current assets	$ 265		$ 265		$ 257

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