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Fair Value Measurement - Summary of Fair Value of Financial Liabilities Measured Using Level 3 Inputs (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value at the beginning of the period		$ (477)	$ (250)
Fair value at the end of the period		(527)	(261)
Allergan transaction [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustments to provisions for contingent consideration	[1]	(64)	(24)
Settlement of contingent consideration		13	2
Eagle Transaction [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustments to provisions for contingent consideration		(14)	(11)
Settlement of contingent consideration		15	21
Novetide transaction [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjustments to provisions for contingent consideration		(1)	(1)
Settlement of contingent consideration		$ 1	$ 2
[1] The financial data presented in the tables above with respect to adjustments to provisions for contingent consideration related to Allergan for the three months ended March 31, 2023 have been revised as discussed in note 1c.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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