The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Identifiable Intangible Assets - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023	Sep. 30, 2023
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets useful life					9 years
Amortization of intangible assets	$ 146	$ 162	$ 298	$ 326
Impairment of intangible assets excluding goodwill	$ 61	63	$ 141	241
Minimum [Member] \| Measurement input, discount rate [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	8.5		8.5
Maximum [Member] \| Measurement input, discount rate [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input	11		11
In process research and development [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input						8.5
In process research and development [Member] \| Minimum [Member] \| Measurement input, discount rate [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input						20
In process research and development [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Business combination, contingent consideration, liability, measurement input						10
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
In process research and development [Member] \| Generic Pipeline Products [Member] \| Development Progress And Changes In Other Key Valuation Assumptions [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	$ 10	35	$ 33	53
Identifiable product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill	$ 51	$ 28	$ 108	188
Identifiable product rights [Member] \| Regulatory Price And Volume Of Products [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill				76
Japan [Member] \| Identifiable product rights [Member] \| Updated Market Assumptions [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets excluding goodwill				$ 112