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Financial Instruments (Narrative) (Details)
€ in Millions, ¥ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Feb. 28, 2023
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
EUR (€)
Sep. 30, 2023
CNY (¥)
Dec. 31, 2022
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Net investment losses on equity securities     $ 62,900,000 $ 123,300,000 $ 141,500,000 $ 667,600,000      
Unfunded commitments to invest in venture capital funds $ 915,000,000   915,000,000   $ 915,000,000        
Unfunded commitments to invest in venture capital funds, anticipated payment period         10 years        
Percentage of nonperforming assets         99.00%        
Accounts receivable derecognized 403,800,000   403,800,000   $ 403,800,000       $ 422,100,000
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 $ 5,380,000,000   $ 5,380,000,000   $ 5,380,000,000       5,450,000,000
Variable rate 12.00%   12.00%   12.00%   12.00% 12.00%  
Losses expected to be reclassified in the next 12 months $ 13,100,000   $ 13,100,000   $ 13,100,000        
Swap U.S. Dollars to Euro                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative liability, notional amount 1,010,000,000.00   1,010,000,000.00   1,010,000,000.00        
Swap Swiss Francs to U.S. Dollars                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative liability, notional amount 1,000,000,000   1,000,000,000   1,000,000,000        
Sell Euro                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative asset, notional amount | €             € 5,230    
Sell Chinese Yuan                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative asset, notional amount | ¥               ¥ 1,800  
Forward-starting interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative, notional amount 1,000,000,000   1,000,000,000   1,000,000,000        
Foreign Currency Denominated Debt                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Long-term debt 6,740,000,000   6,740,000,000   6,740,000,000       $ 6,830,000,000
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              
Stated interest rate   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 2024 | Maturity Date 2024 | Line of Credit                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Line of credit facility, maximum borrowing capacity $ 4,000,000,000   $ 4,000,000,000   $ 4,000,000,000        
Debt instrument, term 364 days