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Collaborative Arrangements - Eisai Co., Ltd. (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Cost of sales	$ 4,080	$ 4,264	$ 11,365	$ 12,214
Selling, general and administrative	2,731	2,519	7,952	7,700
Research and development	5,862	3,307	13,354	20,904
Other current assets	40,361		40,361		$ 32,168
Accrued and other current liabilities	16,539		16,539		15,766
Eisai
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Amortization of intangible assets		81		154
Eisai | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue from collaborative arrangement	251	260	755	734
Cost of sales	60	137	181	320
Selling, general and administrative	40	46	120	145
Research and development	4	$ 5	18	$ 61
Other current assets	252		252		226
Accrued and other current liabilities	$ 0		$ 0		$ 125

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