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Debt, Credit Facilities, and Commitments and Contingencies - Long-Term Debt - Additional Information (Details)
1 Months Ended 12 Months Ended
Jul. 12, 2019
USD ($)
Jun. 25, 2019
USD ($)
Nov. 30, 2019
USD ($)
Oct. 31, 2019
EUR (€)
Sep. 30, 2019
USD ($)
Nov. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
May 31, 2018
USD ($)
Nov. 30, 2016
EUR (€)
May 31, 2016
Sep. 30, 2015
May 31, 2015
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Feb. 01, 2020
USD ($)
Dec. 31, 2019
EUR (€)
Oct. 25, 2019
USD ($)
Oct. 25, 2019
EUR (€)
Sep. 30, 2019
EUR (€)
Aug. 31, 2019
USD ($)
Nov. 30, 2012
Long-term debt                                            
Bridge credit agreement maximum borrowing capacity                                         $ 4,000,000,000.0  
Repayments of long-term debt                         $ 1,536,000,000 $ 6,035,000,000 $ 25,000,000              
Aggregate principal amount outstanding                         66,728,000,000 $ 36,611,000,000                
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                                      
Special mandatory redemption price pending the proposed acquisition     101.00%                                      
Senior notes | Floating rate notes due May 2021                                            
Long-term debt                                            
Aggregate principal amount of debt     $ 750,000,000                                      
Senior notes | Floating rate notes due November 2021                                            
Long-term debt                                            
Aggregate principal amount of debt     750,000,000                                      
Senior notes | Floating rate notes due 2022                                            
Long-term debt                                            
Aggregate principal amount of debt     750,000,000                                      
Senior notes | 2.15% notes due 2021                                            
Long-term debt                                            
Aggregate principal amount of debt     $ 1,750,000,000                                      
Stated interest rate (as a percent)     2.15%                                      
Senior notes | 2.30% notes due 2022                                            
Long-term debt                                            
Aggregate principal amount of debt     $ 3,000,000,000.0                                      
Stated interest rate (as a percent)     2.30%                                      
Senior notes | 2.60% notes due 2024                                            
Long-term debt                                            
Aggregate principal amount of debt     $ 3,750,000,000                                      
Stated interest rate (as a percent)     2.60%                                      
Senior notes | 2.95% notes due 2026                                            
Long-term debt                                            
Aggregate principal amount of debt     $ 4,000,000,000.0                                      
Stated interest rate (as a percent)     2.95%                                      
Senior notes | 3.20% notes due 2029                                            
Long-term debt                                            
Aggregate principal amount of debt     $ 5,500,000,000                                      
Stated interest rate (as a percent)     3.20%                                      
Senior notes | 4.05% notes due 2039                                            
Long-term debt                                            
Aggregate principal amount of debt     $ 4,000,000,000.0                                      
Stated interest rate (as a percent)     4.05%                                      
Senior notes | 4.25% notes due 2049                                            
Long-term debt                                            
Aggregate principal amount of debt     $ 5,750,000,000                                      
Stated interest rate (as a percent)     4.25%                                      
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 | Allergan Notes                                            
Long-term debt                                            
Principal amount of borrowings                                   $ 15,500,000,000        
Senior notes | Allergan Euro Notes                                            
Long-term debt                                            
Principal amount of borrowings | €                                     € 3,700,000,000      
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 month                                  
Senior notes | September 2019 senior Euro notes | Maximum                                            
Long-term debt                                            
Senior note redemption period prior to maturity         3 months                                  
Senior notes | 0.75% notes due 2027 (€750 principal)                                            
Long-term debt                                            
Aggregate principal amount of debt | €                                       € 750,000,000    
Stated interest rate (as a percent)         0.75%                             0.75%    
Senior notes | 1.25% notes due 2031 (€650 principal)                                            
Long-term debt                                            
Aggregate principal amount of debt | €                                       € 650,000,000    
Stated interest rate (as a percent)         1.25%                             1.25%    
Senior notes | 0.375% notes due 2019 (€1,400 principal)                                            
Long-term debt                                            
Aggregate principal amount of debt | €                 € 1,400,000,000                          
Stated interest rate (as a percent)       0.375%         0.375%                          
Repayments of long-term debt | €       € 1,400,000,000                                    
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                                            
Aggregate principal amount of debt             $ 1,250,000,000                              
Stated interest rate (as a percent)             3.375%                              
Senior notes | 3.75% notes due 2023                                            
Long-term debt                                            
Aggregate principal amount of debt             $ 1,250,000,000                              
Stated interest rate (as a percent)             3.75%                              
Senior notes | 4.25% notes due 2028                                            
Long-term debt                                            
Aggregate principal amount of debt             $ 1,750,000,000                              
Stated interest rate (as a percent)             4.25%                              
Senior notes | 4.875% notes due 2048                                            
Long-term debt                                            
Aggregate principal amount of debt             $ 1,750,000,000                              
Stated interest rate (as a percent)             4.875%                              
Senior notes | 2.00% notes due 2018                                            
Long-term debt                                            
Stated interest rate (as a percent)                                           2.00%
Repayments of long-term debt           $ 1,000,000,000.0                                
Senior notes | 1.80% notes due 2018                                            
Long-term debt                                            
Stated interest rate (as a percent)                       1.80%                    
Repayments of long-term debt               $ 3,000,000,000.0                            
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 month                        
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                         13,700,000,000                  
Senior notes | Senior notes issued in 2015 | Minimum                                            
Long-term debt                                            
Senior note redemption period prior to maturity                       1 month                    
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 | July 2019 term loan agreement                                            
Long-term debt                                            
Debt issuance costs incurred $ 242,000,000                                          
Principal amount of borrowings $ 6,000,000,000.0                                          
Amount drawn under credit agreement                         0                  
Term loan facilities | July 2019 three-year term loan tranche                                            
Long-term debt                                            
Term loan credit agreement term 3 years                                          
Principal amount of borrowings $ 2,500,000,000                                          
Term loan facilities | July 2019 five-year term loan tranche                                            
Long-term debt                                            
Term loan credit agreement term 5 years                                          
Principal amount of borrowings $ 2,000,000,000.0                                          
Term loan facilities | September 2015 term loan agreement                                            
Long-term debt                                            
Term loan credit agreement term                     3 years                      
Repayments of long-term debt             $ 2,000,000,000.0                              
Bridge credit agreement | June 2019 bridge credit agreement                                            
Long-term debt                                            
Bridge credit agreement maximum borrowing capacity   $ 38,000,000,000.0 $ 2,000,000,000.0                                      
Term loan credit agreement term   364 days                                        
Amount drawn under credit agreement                         $ 0                  
Term loan facilities | July 2019 364-day term loan tranche                                            
Long-term debt                                            
Term loan credit agreement term 364 days                                          
Principal amount of borrowings $ 1,500,000,000                                          
Subsequent event | Bridge credit agreement | June 2019 bridge credit agreement                                            
Long-term debt                                            
Bridge credit agreement maximum borrowing capacity                               $ 0