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Integration and Restructuring Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allergan integration plan      
Restructuring charges      
Integration related costs $ 2,000    
Allergan integration plan | Employee Severance      
Restructuring charges      
Charges associated with integration or restructuring plans 69 $ 696  
Restructuring reserve rollforward      
Accrued balance beginning of the period 367    
Integration and restructuring charges 65 594  
Payments and other adjustments (210) (227)  
Accrued balance end of the period 222 367  
Allergan integration plan | Other restructuring      
Restructuring charges      
Charges associated with integration or restructuring plans 518 435  
Restructuring reserve rollforward      
Accrued balance beginning of the period 20    
Integration and restructuring charges 461 435  
Payments and other adjustments (448) (415)  
Accrued balance end of the period 33 20  
Allergan integration plan | Cost of products sold | Employee Severance      
Restructuring charges      
Charges associated with integration or restructuring plans 5 109  
Allergan integration plan | Cost of products sold | Other restructuring      
Restructuring charges      
Charges associated with integration or restructuring plans 127 21  
Allergan integration plan | Research and development | Employee Severance      
Restructuring charges      
Charges associated with integration or restructuring plans 0 199  
Allergan integration plan | Research and development | Other restructuring      
Restructuring charges      
Charges associated with integration or restructuring plans 102 177  
Allergan integration plan | Selling, general and administrative | Employee Severance      
Restructuring charges      
Charges associated with integration or restructuring plans 64 388  
Allergan integration plan | Selling, general and administrative | Other restructuring      
Restructuring charges      
Charges associated with integration or restructuring plans 289 237  
Other restructuring      
Restructuring reserve rollforward      
Accrued balance beginning of the period 90 140 $ 99
Integration and restructuring charges 54 58 219
Payments and other adjustments (111) (108) (178)
Accrued balance end of the period 33 90 140
Other restructuring | Employee Severance      
Restructuring charges      
Charges associated with integration or restructuring plans $ 59 $ 60 $ 234