v3.20.4
Debt, Credit Facilities, and Commitments and Contingencies - Long-Term Debt - Additional Information (Details)
1 Months Ended 12 Months Ended
Nov. 30, 2020
EUR (€)
Nov. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
May 31, 2020
USD ($)
Nov. 30, 2019
USD ($)
Oct. 31, 2019
EUR (€)
Sep. 30, 2019
USD ($)
Aug. 31, 2019
Nov. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
May 31, 2018
USD ($)
Nov. 30, 2016
May 31, 2016
Sep. 30, 2015
May 31, 2015
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
EUR (€)
May 31, 2020
EUR (€)
May 31, 2020
USD ($)
Nov. 30, 2012
Long-term debt                                                
Aggregate principal amount outstanding                                 $ 66,728,000,000     $ 86,022,000,000        
Repayments of long-term debt                               $ 5,683,000,000 $ 1,536,000,000 $ 6,035,000,000            
Stated interest rate (as a percent)                                           1.25% 1.25%  
Aggregate principal amount of debt | €                                           € 700,000,000    
Revolving credit facility                                                
Long-term debt                                                
Revolving credit facility term               5 years                                
Senior notes | Allergan notes exchanged                                                
Long-term debt                                                
Aggregate principal amount outstanding                                             $ 14,000,000,000.0  
Senior notes | Allergan Euro notes exchanged                                                
Long-term debt                                                
Aggregate principal amount outstanding | €                                           3,100,000,000    
Senior notes | Allergan Notes                                                
Long-term debt                                                
Aggregate principal amount outstanding                                             $ 1,500,000,000  
Senior notes | Allergan Euro Notes                                                
Long-term debt                                                
Aggregate principal amount outstanding | €                                           € 635,000,000    
Senior notes | 3.375% Senior Notes due 2020                                                
Long-term debt                                                
Repayments of long-term debt     $ 650,000,000                                          
Stated interest rate (as a percent)                                         3.375%      
Senior notes | Floating rate Euro notes due 2020                                                
Long-term debt                                                
Repayments of long-term debt | € € 700,000,000                                              
Senior notes | 4.875% notes due 2021                                                
Long-term debt                                                
Repayments of long-term debt   $ 450,000,000                                            
Stated interest rate (as a percent) 4.875% 4.875%                                            
Senior notes | Senior notes issued in 2019                                                
Long-term debt                                                
Aggregate principal amount of debt         $ 30,000,000,000.0                                      
Debt issuance costs incurred         173,000,000                                      
Debt discounts         $ 52,000,000                                      
Senior notes | Senior notes issued in 2019 excluding fixed-rate notes due in 2021 and 2022 | Minimum                                                
Long-term debt                                                
Senior note redemption period prior to maturity                   1 month                            
Senior notes | Senior notes issued in 2019 excluding fixed-rate notes due in 2021 and 2022 | Maximum                                                
Long-term debt                                                
Senior note redemption period prior to maturity         6 months                                      
Senior notes | 2.50% notes due 2020                                                
Long-term debt                                                
Repayments of long-term debt       $ 3,800,000,000                                        
Stated interest rate (as a percent)                             2.50%             2.50% 2.50%  
Senior notes | September 2019 senior Euro notes                                                
Long-term debt                                                
Aggregate principal amount of debt | €                                         € 1,400,000,000      
Debt issuance costs incurred             $ 9,000,000                                  
Debt discounts             $ 5,000,000                                  
Senior notes | September 2019 senior Euro notes | Minimum                                                
Long-term debt                                                
Senior note redemption period prior to maturity             1 year                                  
Senior notes | September 2019 senior Euro notes | Maximum                                                
Long-term debt                                                
Senior note redemption period prior to maturity             3 months                                  
Senior notes | 0.375% senior Euros notes due 2019                                                
Long-term debt                                                
Repayments of long-term debt | €           € 1,400,000,000                                    
Stated interest rate (as a percent)           0.375%                                    
Senior notes | 1.80% notes due 2018                                                
Long-term debt                                                
Repayments of long-term debt                     $ 3,000,000,000.0                          
Stated interest rate (as a percent)                             1.80%                  
Senior notes | Senior notes issued in 2018                                                
Long-term debt                                                
Aggregate principal amount of debt                   $ 6,000,000,000.0                            
Debt issuance costs incurred                   37,000,000                            
Debt discounts                   37,000,000                            
Senior notes net issuance proceeds                   $ 5,900,000,000                            
Senior notes | Senior notes issued in 2018 | Minimum                                                
Long-term debt                                                
Senior note redemption period prior to maturity                   1 month                            
Senior notes | Senior notes issued in 2018 | Maximum                                                
Long-term debt                                                
Senior note redemption period prior to maturity                   6 months                            
Senior notes | 3.375% notes due 2021                                                
Long-term debt                                                
Stated interest rate (as a percent)                   3.375%                            
Senior notes | 2.00% notes due 2018                                                
Long-term debt                                                
Repayments of long-term debt                 $ 1,000,000,000.0                              
Stated interest rate (as a percent)                                               2.00%
Senior notes | Senior Euro notes                                                
Long-term debt                                                
Aggregate principal amount outstanding | €                                     € 2,200,000,000          
Senior notes | Senior Euro notes | Minimum                                                
Long-term debt                                                
Senior note redemption period prior to maturity                       1 month                        
Senior notes | Senior Euro notes | Maximum                                                
Long-term debt                                                
Senior note redemption period prior to maturity                       3 months                        
Senior notes | Senior notes issued in 2016                                                
Long-term debt                                                
Aggregate principal amount outstanding                                       7,800,000,000        
Senior notes | Senior notes issued in 2016 | Minimum                                                
Long-term debt                                                
Senior note redemption period prior to maturity                         1 year                      
Senior notes | Senior notes issued in 2016 | Maximum                                                
Long-term debt                                                
Senior note redemption period prior to maturity                         6 months                      
Senior notes | Senior notes issued in 2015                                                
Long-term debt                                                
Aggregate principal amount outstanding                                       10,000,000,000.0        
Senior notes | Senior notes issued in 2015 | Minimum                                                
Long-term debt                                                
Senior note redemption period prior to maturity                             1 year                  
Senior notes | Senior notes issued in 2015 | Maximum                                                
Long-term debt                                                
Senior note redemption period prior to maturity                             6 months                  
Senior notes | Senior notes issued in 2012                                                
Long-term debt                                                
Aggregate principal amount outstanding                                       5,700,000,000        
Term loan facilities | May 2020 floating rate term loans                                                
Long-term debt                                                
Principal amount of debt       $ 3,000,000,000.0                                        
Term loan facilities | July 2019 term loan agreement                                                
Long-term debt                                                
Maximum borrowing capacity of term loan credit agreement                                             $ 6,000,000,000.0  
Term loan facilities | Floating rate notes due 2023                                                
Long-term debt                                                
Aggregate principal amount outstanding                                       1,000,000,000.0        
Term loan credit agreement term       3 years                                        
Term loan facilities | Floating rate notes due 2025                                                
Long-term debt                                                
Aggregate principal amount outstanding                                       $ 2,000,000,000.0        
Term loan credit agreement term       5 years                                        
Term loan facilities | September 2015 term loan agreement                                                
Long-term debt                                                
Repayments of long-term debt                   $ 2,000,000,000.0                            
Term loan credit agreement term                           3 years