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Financial Instruments and Fair Value Measures - Debt and Credit Facilities (Details)
€ in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2024
EUR (€)
Mar. 31, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Feb. 12, 2024
USD ($)
Dec. 21, 2023
USD ($)
Dec. 06, 2023
USD ($)
Short-Term Borrowings [Line Items]                        
Short-term borrowings $ 3,790           $ 3,790   $ 0      
Proceeds from issuance of other short-term borrowings             4,798 $ 5,008        
Repayments of other short-term borrowings             2,007 $ 5,008        
Commercial paper                        
Short-Term Borrowings [Line Items]                        
Short-term borrowings 1,800           $ 1,800          
Short-Term Debt, Weighted Average Interest Rate, over Time             4.59% 5.54%        
December 2023 Bridge Credit Facility                        
Short-Term Borrowings [Line Items]                        
Line of Credit Facility, Maximum Borrowing Capacity                       $ 9,000
364-day Term Loan Credit Agreement                        
Short-Term Borrowings [Line Items]                        
Line of Credit Facility, Maximum Borrowing Capacity 4,000           $ 4,000       $ 5,000  
Short-term borrowings   $ 2,000                    
Debt Instrument, Basis Spread on Variable Rate   0.70%                    
Commercial Paper With Original Maturities Greater Than Three Months                        
Short-Term Borrowings [Line Items]                        
Short-term borrowings $ 791           $ 791          
Term loan facilities                        
Debt and Credit Facilities [Line Items]                        
Long-Term Debt, Weighted Average Interest Rate, over Time           6.29%            
Senior Notes Issued in 2024                        
Debt and Credit Facilities [Line Items]                        
Debt Issuance Costs, Gross           $ 99            
Debt Instrument, Unamortized Discount           37            
Senior Notes Issued in 2024 | Senior notes                        
Debt and Credit Facilities [Line Items]                        
Aggregate principal amount of debt           15,000            
December 2023 Term Loan Credit Agreement                        
Short-Term Borrowings [Line Items]                        
Proceeds from Other Short-Term Debt           5,000            
Repayments of other short-term borrowings           $ 5,000            
Debt Instrument, Basis Spread on Variable Rate           0.975%            
3.80% Senior Notes | Senior notes                        
Debt and Credit Facilities [Line Items]                        
Stated interest rate (as a percent)     3.80%                  
3.80% Senior Notes | Term loan facilities                        
Debt and Credit Facilities [Line Items]                        
Repayments of long-term debt     $ (3,000)                  
4.65% Senior Notes due 2028 | Senior notes                        
Debt and Credit Facilities [Line Items]                        
Stated interest rate (as a percent) 4.65%           4.65%          
Aggregate principal amount of debt $ 1,250           $ 1,250          
4.875% Senior Notes due 2030 | Senior notes                        
Debt and Credit Facilities [Line Items]                        
Stated interest rate (as a percent) 4.875%           4.875%          
Aggregate principal amount of debt $ 1,000           $ 1,000          
5.20% Senior Notes due 2035 | Senior notes                        
Debt and Credit Facilities [Line Items]                        
Stated interest rate (as a percent) 5.20%           5.20%          
Aggregate principal amount of debt $ 1,000           $ 1,000          
5.60% Senior Notes due 2055 | Senior notes                        
Debt and Credit Facilities [Line Items]                        
Stated interest rate (as a percent) 5.60%           5.60%          
Aggregate principal amount of debt $ 750           $ 750          
Senior Notes Issued in 2025 | Senior notes                        
Debt and Credit Facilities [Line Items]                        
Aggregate principal amount of debt 4,000           4,000          
ImmunoGen Senior Secured Term Loan                        
Debt and Credit Facilities [Line Items]                        
Other Long-Term Debt                   $ (99)    
3.60% Senior Notes | Senior notes                        
Debt and Credit Facilities [Line Items]                        
Stated interest rate (as a percent)   3.60%                    
3.60% Senior Notes | Term loan facilities                        
Debt and Credit Facilities [Line Items]                        
Repayments of long-term debt   $ (3,800)                    
1.38% Senior Notes | Senior notes                        
Debt and Credit Facilities [Line Items]                        
Stated interest rate (as a percent)       1.38% 1.38%              
1.38% Senior Notes | Term loan facilities                        
Debt and Credit Facilities [Line Items]                        
Repayments of long-term debt | €         € (1,500)              
1.25% Senior Euro Notes due 2024 | Senior notes                        
Debt and Credit Facilities [Line Items]                        
Stated interest rate (as a percent)       1.25% 1.25%              
1.25% Senior Euro Notes due 2024 | Term loan facilities                        
Debt and Credit Facilities [Line Items]                        
Repayments of long-term debt | €         € (700)              
3.85% Senior Euro Notes due 2024 | Senior notes                        
Debt and Credit Facilities [Line Items]                        
Stated interest rate (as a percent)       3.85% 3.85%              
3.85% Senior Euro Notes due 2024 | Term loan facilities                        
Debt and Credit Facilities [Line Items]                        
Repayments of long-term debt       $ (1,000)                
Revolving Credit Facility                        
Short-Term Borrowings [Line Items]                        
Long-Term Line of Credit $ 0           0   $ 0      
Revolving Credit Facility Maturing 2028                        
Short-Term Borrowings [Line Items]                        
Line of Credit Facility, Expiration Period 5 years                      
Line of Credit Facility, Maximum Borrowing Capacity $ 5,000           5,000          
Revolving Credit Facility Maturing 2030                        
Short-Term Borrowings [Line Items]                        
Line of Credit Facility, Expiration Period 5 years                      
Line of Credit Facility, Maximum Borrowing Capacity $ 3,000           $ 3,000