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Collaborative Arrangements - Daiicho Sankyo (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Selling, general and administrative	$ 2,739		$ 2,702	$ 5,221	$ 5,182
Research and development	3,500		13,321	7,492	17,597
Accrued and other current liabilities	14,712	$ 15,766		14,712
Daiichi Sankyo | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Selling, general and administrative	14		0	16	0
Research and development	65	5,500	$ 0	133	$ 0
Accrued and other current liabilities	801	800		801
Other noncurrent liabilities	$ 750	$ 750		$ 750

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