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Financing (Commercial Paper Programs and Credit Facilities) (Narrative) (Details)
€ in Millions
Dec. 31, 2025
EUR (€)
Aug. 11, 2023
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
USD ($)
Aug. 10, 2023
USD ($)
Line of Credit Facility [Line Items]            
Debt discounts, premiums and debt issuance costs     $ 93,000,000   $ 96,000,000  
Long-term debt     $ 18,418,000,000   16,005,000,000  
Euro-denominated commercial paper | Commercial paper            
Line of Credit Facility [Line Items]            
Debt, weighted average annual interest rate, basis points 2.20%   2.20%      
Long-term debt weighted average maturity 21 days          
Long-term debt € 933   $ 1,097,000,000 € 931 $ 965,000,000  
Euro-Denominated Commercial Paper, 2026 Biopharma Euro Notes and 2026 Euro Notes            
Line of Credit Facility [Line Items]            
Long-term debt     3,500,000,000      
Revolving credit facility | Multiyear Credit Facility, Superseded            
Line of Credit Facility [Line Items]            
Credit facility, borrowings outstanding   $ 0        
Revolving credit facility | Multiyear Credit Facility, Superseded | Line of Credit            
Line of Credit Facility [Line Items]            
Line of credit, maximum borrowing capacity           $ 5,000,000,000.0
Revolving credit facility | Third Amended and Restated Multiyear Credit Facility | Debt Rate, Condition Two            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   1.00%        
Revolving credit facility | Third Amended and Restated Multiyear Credit Facility | Line of Credit            
Line of Credit Facility [Line Items]            
Line of credit, maximum borrowing capacity   $ 5,000,000,000.0        
Option to extend period   1 year        
Additional borrowing capacity   $ 2,500,000,000        
Credit facility, borrowings outstanding     $ 0      
Debt instrument, covenants, leverage ratio   0.65        
Revolving credit facility | Third Amended and Restated Multiyear Credit Facility | SOFR | Debt Rate, Condition One            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   1.00%        
Revolving credit facility | Third Amended and Restated Multiyear Credit Facility | Federal funds rate            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   0.50%        
Revolving credit facility | Third Amended and Restated Multiyear Credit Facility | Base rate            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   0.00%        
Revolving credit facility | Third Amended and Restated Multiyear Credit Facility | Minimum            
Line of Credit Facility [Line Items]            
Commitment fee, percent   0.04%        
Revolving credit facility | Third Amended and Restated Multiyear Credit Facility | Minimum | Debt Rate, Condition Two            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   0.00%        
Revolving credit facility | Third Amended and Restated Multiyear Credit Facility | Minimum | Swing Line Loans            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   0.585%        
Revolving credit facility | Third Amended and Restated Multiyear Credit Facility | Minimum | Alternative Currency Loans            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   0.585%        
Revolving credit facility | Third Amended and Restated Multiyear Credit Facility | Minimum | SOFR            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   0.585%        
Revolving credit facility | Third Amended and Restated Multiyear Credit Facility | Maximum            
Line of Credit Facility [Line Items]            
Commitment fee, percent   0.11%        
Revolving credit facility | Third Amended and Restated Multiyear Credit Facility | Maximum | Debt Rate, Condition Two            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   0.015%        
Revolving credit facility | Third Amended and Restated Multiyear Credit Facility | Maximum | Swing Line Loans            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   1.015%        
Revolving credit facility | Third Amended and Restated Multiyear Credit Facility | Maximum | Alternative Currency Loans            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   1.015%        
Revolving credit facility | Third Amended and Restated Multiyear Credit Facility | Maximum | SOFR            
Line of Credit Facility [Line Items]            
Basis spread percentage to determine floating interest rate   1.015%