v3.26.3
Identifiable intangible assets - Summary of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Intangible Asset, Finite-Lived [Line Items]    
Gross carrying amount net of impairment $ 16,859 $ 17,111
Accumulated amortization 13,556 13,330
Net carrying amount 3,303 3,781
Product rights    
Intangible Asset, Finite-Lived [Line Items]    
Gross carrying amount net of impairment 16,078 16,308
Accumulated amortization 13,192 12,990
Net carrying amount 2,886 3,318
Trade names    
Intangible Asset, Finite-Lived [Line Items]    
Gross carrying amount net of impairment 589 597
Accumulated amortization 364 340
Net carrying amount 225 257
In process research and development    
Intangible Asset, Finite-Lived [Line Items]    
Gross carrying amount net of impairment 192 206
Accumulated amortization 0 0
Net carrying amount $ 192 $ 206