v3.26.3
Restructuring - Narrative (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
USD ($)
Sep. 30, 2026
USD ($)
Phase I of the Indivior Action Agenda    
Restructuring Cost and Reserve [Line Items]    
Cumulative restructuring charges incurred since inception $ 143 $ 143
Restructuring charges   16
Additional costs expected 0 0
Phase I of the Indivior Action Agenda | Legal, Consulting and Other Costs    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 2  
Phase I of the Indivior Action Agenda | Severance    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 1  
Phase I of the Indivior Action Agenda | Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges   8
Phase I of the Indivior Action Agenda | Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges   8
Cease Phase 3 Development of INDV-6001 and not Advance INDV-2000 Internally    
Restructuring Cost and Reserve [Line Items]    
Cumulative restructuring charges incurred since inception 6 6
Restructuring charges   6
Additional costs expected $ 0 0
Cease Phase 3 Development of INDV-6001 and not Advance INDV-2000 Internally | Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges   5
Cease Phase 3 Development of INDV-6001 and not Advance INDV-2000 Internally | Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges   $ 1