Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount net of impairment	$ 17,207	$ 16,716
Accumulated amortization	13,065	12,298
Net carrying amount	4,142	4,418
Product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount net of impairment	16,399	15,915
Accumulated amortization	12,743	11,998
Net carrying amount	3,656	3,917
Trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount net of impairment	595	568
Accumulated amortization	322	300
Net carrying amount	273	268
In process research and development [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount net of impairment	213	233
Accumulated amortization	0	0
Net carrying amount	$ 213	$ 233

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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