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Integration and Restructuring Plans (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Allergan integration plan    
Restructuring charges    
Integration related costs $ 2,000  
Allergan integration plan | Severance and employee benefits    
Restructuring charges    
Charges associated with integration or restructuring plans 23 $ 0
Restructuring reserve rollforward    
Accrued balance beginning of the period 367  
Restructuring charges 21  
Payments and other adjustments (46)  
Accrued balance end of the period 342  
Allergan integration plan | Severance and employee benefits | Cost of products sold    
Restructuring charges    
Charges associated with integration or restructuring plans 6 0
Allergan integration plan | Severance and employee benefits | Research and development    
Restructuring charges    
Charges associated with integration or restructuring plans 0 0
Allergan integration plan | Severance and employee benefits | Selling, general and administrative    
Restructuring charges    
Charges associated with integration or restructuring plans 17 0
Allergan integration plan | Other integration    
Restructuring charges    
Charges associated with integration or restructuring plans 116 38
Restructuring reserve rollforward    
Accrued balance beginning of the period 20  
Restructuring charges 108  
Payments and other adjustments (102)  
Accrued balance end of the period 26  
Allergan integration plan | Other integration | Cost of products sold    
Restructuring charges    
Charges associated with integration or restructuring plans 15 0
Allergan integration plan | Other integration | Research and development    
Restructuring charges    
Charges associated with integration or restructuring plans 51 0
Allergan integration plan | Other integration | Selling, general and administrative    
Restructuring charges    
Charges associated with integration or restructuring plans 50 38
Other restructuring    
Restructuring charges    
Charges associated with integration or restructuring plans 38 $ 17
Restructuring reserve rollforward    
Accrued balance beginning of the period 90  
Restructuring charges 38  
Payments and other adjustments (36)  
Accrued balance end of the period $ 92