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Certain Transactions - Other Transactions - Additional Information (Detail) - USD ($) $ in Millions			1 Months Ended				3 Months Ended								9 Months Ended		12 Months Ended
	Jul. 31, 2024	Nov. 09, 2023	Jan. 31, 2024	Oct. 31, 2021	Dec. 31, 2016	Nov. 30, 2013	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2024	Mar. 28, 2024	Oct. 03, 2023	Sep. 29, 2023
Noncash or Part Noncash Acquisitions [Line Items]
Other commitment																							$ 150
Additional milestone payment payable																						$ 150
Sanofi [Member] | Collaborative Arrangement [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Milestone payment receivable																								$ 500
Development and launch milestone payment receivable																								$ 1,000
Biolojic Design Ltd [Member] | Collaborative Arrangement [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Additional development and milestone payments receivable							$ 500								$ 500
Biolojic Design Ltd [Member] | Research and Development Expense [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Milestone payment			$ 10					$ 5
Royalty Pharma [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Collaborative agreement milestone payments		$ 100
Term of royalty payment		5 years
Royalty Pharma [Member] | Research and Development Expense [Member] | Collaborative Arrangement [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Reimbursement of research and development expenses incurred																	$ 100	$ 100
Takeda [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Upfront payment					$ 30
Milestone payment					$ 20								$ 25
TEVA Mabxience [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Milestone payment							17	$ 12
Teva's API business [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax															6
Abingworth [Member] | Research and Development Expense [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Reimbursement of research and development expenses incurred															$ 88	$ 42
Teva [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Cost of the investment																									$ 40
Alvotech [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Collaborative agreement milestone payments																$ 375
Proceeds from available for sale debt securities	$ 44
Alvotech [Member] | Research and Development Expense [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Milestone payment									$ 5								124	$ 124	$ 124	$ 124	$ 124
mAbxience [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Collaborative agreement milestone payments																	291
mAbxience [Member] | Research and Development Expense [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Aggregate upfront and milestone payments										$ 15							$ 20
MedinCell [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Milestone payment												$ 3
Collaborative agreement milestone payments						$ 105					$ 112
MedinCell [Member] | Research and Development Expense [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Milestone payment									$ 5
MODAG [Member]
Noncash or Part Noncash Acquisitions [Line Items]
License agreement potential aggregate milestone payments amount				$ 20
MODAG [Member] | Research and Development Expense [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Milestone payment														$ 10
Milestone payment to be paid							$ 10

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