Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount net of impairment	$ 18,660	$ 19,982
Accumulated amortization	12,267	12,516
Net carrying amount	6,393	7,466
Product rights
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount net of impairment	17,599	18,815
Accumulated amortization	12,050	12,318
Net carrying amount	5,548	6,497
Trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount net of impairment	556	590
Accumulated amortization	216	198
Net carrying amount	340	392
In process research and development [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount net of impairment	505	577
Net carrying amount	$ 505	$ 577