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Financial Instruments - Narrative (Details)
€ in Millions, ¥ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2024
USD ($)
Feb. 29, 2024
USD ($)
Feb. 28, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
EUR (€)
Sep. 30, 2024
CNY (¥)
Dec. 31, 2023
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Net investment gains (losses) on equity securities       $ 112,400,000 $ (62,900,000) $ (29,500,000) $ (141,500,000)      
Unfunded commitments to invest in venture capital funds       925,000,000   $ 925,000,000        
Unfunded commitments to invest in venture capital funds, anticipated payment period           10 years        
Proceeds from sales of available-for-sale investments       23,200,000 $ 60,000,000.0 $ 68,600,000 $ 121,800,000      
Accounts receivable derecognized       419,200,000   $ 419,200,000       $ 431,900,000
Average remaining maturity of foreign currency derivatives           12 months        
Maximum remaining maturity of foreign currency derivatives           180 days        
Foreign currency-denominated notes, designated as hedge       $ 5,750,000,000   $ 5,750,000,000       5,670,000,000
Variable rate       5.00%   5.00%   5.00% 5.00%  
Losses expected to be reclassified in the next 12 months       $ 4,300,000   $ 4,300,000        
Swap U.S. Dollars to Euro                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Derivative liability, notional amount       728,600,000   728,600,000        
Swap Swiss Francs to U.S. Dollars                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Derivative liability, notional amount       402,300,000   402,300,000        
Sell Euro                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Derivative asset, notional amount | €               € 4,300    
Sell Chinese Yuan                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Derivative asset, notional amount | ¥                 ¥ 3,200  
Foreign Currency Denominated Debt                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Long-term debt       6,500,000,000   6,500,000,000       $ 7,140,000,000
4.150% Notes Due 2027 | Senior Notes                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Debt instrument, face amount $ 750,000,000                  
Stated interest rate 4.15%                  
4.2% Notes Due 2029 | Senior Notes                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Debt instrument, face amount $ 1,000,000,000                  
Stated interest rate 4.20%                  
4.6% Notes Due 2034 | Senior Notes                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Debt instrument, face amount $ 1,250,000,000                  
Stated interest rate 4.60%                  
5.050% Notes Due 2054 | Senior Notes                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Debt instrument, face amount $ 1,250,000,000                  
Stated interest rate 5.05%                  
5.200% Notes Due 2064 | Senior Notes                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Debt instrument, face amount $ 750,000,000                  
Stated interest rate 5.20%                  
4.5% Notes Due 2027 | Senior Notes                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Debt instrument, face amount   $ 1,000,000,000                
Stated interest rate   4.50%                
4.5% Notes Due 2029 | Senior Notes                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Debt instrument, face amount   $ 1,000,000,000                
Stated interest rate   4.50%                
4.7% Notes Due 2034 | Senior Notes                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Debt instrument, face amount   $ 1,500,000,000                
Stated interest rate   4.70%                
5.0% Notes Due 2054 | Senior Notes                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Debt instrument, face amount   $ 1,500,000,000                
Stated interest rate   5.00%                
5.1% Notes Due 2064 | Senior Notes                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Debt instrument, face amount   $ 1,500,000,000                
Stated interest rate   5.10%                
Senior Notes Due 2027, 2029, 2034, 2054, 2064 | Senior Notes                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Proceeds from issuance of debt $ 4,960,000,000 $ 6,450,000,000                
5.0% Notes Due 2026 | Senior Notes                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Debt instrument, face amount   $ 750,000,000 $ 750,000,000              
Stated interest rate   5.00% 5.00%              
4.7% Notes Due 2033 | Senior Notes                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Debt instrument, face amount     $ 1,000,000,000              
Stated interest rate     4.70%              
4.875% Notes Due 2053 | Senior Notes                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Debt instrument, face amount     $ 1,250,000,000              
Stated interest rate     4.875%              
4.95% Notes Due 2063 | Senior Notes                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Debt instrument, face amount     $ 1,000,000,000              
Stated interest rate     4.95%              
Senior Notes Due 2026, 2033, 2053 And 2063 | Senior Notes                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Proceeds from issuance of debt     $ 3,960,000,000              
Credit Facility 2025 | Line of Credit | Maturity Date 2025                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Line of credit facility, maximum borrowing capacity       5,000,000,000   $ 5,000,000,000        
Debt instrument, term           364 days        
Credit Facility 2028 | Line of Credit | Maturity Date 2028                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Line of credit facility, maximum borrowing capacity       $ 3,000,000,000   $ 3,000,000,000