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Identifiable Intangible Assets - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets useful life					7 years
Amortization of intangible assets	$ 139	$ 148	$ 276	$ 292
Impairment of intangible assets excluding goodwill	$ 22	$ 42	$ 30	163
Impairment, Intangible Asset, Statement of Income or Comprehensive Income [Extensible Enumeration]	Intangible Assets Impairments	Intangible Assets Impairments
Minimum [Member] \| Measurement input, discount rate [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	7.5		7.5
Maximum [Member] \| Measurement input, discount rate [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	11		11
Generic Pipeline Products [Member] \| In Process Research And Development To Product Rights [Member] \| Development Progress And Changes In Other Key Valuation Assumptions [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill				10
In process research and development [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	7.5		7.5
In process research and development [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	11.25		11.25
In process research and development [Member] \| Maximum [Member] \| Measurement input, discount rate [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	90		90
Identifiable product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill			$ 29	153
Identifiable product rights [Member] \| Regulatory Price And Volume Of Products [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill				87
Identifiable product rights [Member] \| Updated Market Assumptions [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill				$ 66