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Borrowings (Narrative) (Details)
€ in Millions, £ in Millions
1 Months Ended 12 Months Ended
Feb. 29, 2024
USD ($)
Feb. 28, 2023
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Feb. 27, 2024
USD ($)
Sep. 30, 2021
EUR (€)
Sep. 30, 2021
GBP (£)
Debt Instrument [Line Items]                  
Weighted average interest rate       539.00% 420.00%        
Line of credit facility, remaining borrowing capacity       $ 7,420,000,000          
Debt extinguishment loss (Note 11)       $ 0 $ 0 $ 405,200,000      
Description of derivative activity volume percent       12.00%          
Debt instrument, interest rate, effective percentage       3.37% 2.87%        
Senior Notes | 4.5% Notes Due 2027 | Subsequent Event                  
Debt Instrument [Line Items]                  
Debt instrument, face amount $ 1,000,000,000                
Stated interest rate 4.50%                
Senior Notes | 4.5% Notes Due 2029 | Subsequent Event                  
Debt Instrument [Line Items]                  
Debt instrument, face amount $ 1,000,000,000                
Stated interest rate 4.50%                
Senior Notes | 4.7% Notes Due 2034 | Subsequent Event                  
Debt Instrument [Line Items]                  
Debt instrument, face amount $ 1,500,000,000                
Stated interest rate 4.70%                
Senior Notes | 5.0% Notes Due 2054 | Subsequent Event                  
Debt Instrument [Line Items]                  
Debt instrument, face amount $ 1,500,000,000                
Stated interest rate 5.00%                
Senior Notes | 5.1% Notes Due 2064 | Subsequent Event                  
Debt Instrument [Line Items]                  
Debt instrument, face amount $ 1,500,000,000                
Stated interest rate 5.10%                
Senior Notes | Senior Notes Due 2027, 2029, 2054 And 2064 | Subsequent Event                  
Debt Instrument [Line Items]                  
Proceeds from issuance of debt $ 6,450,000,000                
Senior Notes | 5.0% notes due 2026                  
Debt Instrument [Line Items]                  
Debt instrument, face amount   $ 750,000,000              
Stated interest rate   5.00%   5.00%          
Senior Notes | 5.0% notes due 2026 | Subsequent Event                  
Debt Instrument [Line Items]                  
Debt instrument, face amount             $ 750,000,000    
Stated interest rate             5.00%    
Senior Notes | 4.7% notes due 2033                  
Debt Instrument [Line Items]                  
Debt instrument, face amount   $ 1,000,000,000              
Stated interest rate   4.70%   4.70%          
Senior Notes | 4.875% notes due 2053                  
Debt Instrument [Line Items]                  
Debt instrument, face amount   $ 1,250,000,000              
Stated interest rate   4.875%   4.875%          
Senior Notes | 4.95% notes due 2063                  
Debt Instrument [Line Items]                  
Debt instrument, face amount   $ 1,000,000,000              
Stated interest rate   4.95%   4.95%          
Senior Notes | Senior Notes Due 2026, 2033, 2053 And 2063                  
Debt Instrument [Line Items]                  
Proceeds from issuance of debt   $ 3,960,000,000              
Foreign Currency Denominated Debt                  
Debt Instrument [Line Items]                  
Debt instrument, face amount               € 1,800 £ 250.0
Payment for debt extinguishment     $ 1,910,000,000            
Extinguishment of debt, amount     1,500,000,000            
Debt extinguishment loss (Note 11)     $ 405,200,000            
Maturity Date 2024                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity       $ 4,000,000,000          
Debt instrument, term       364 days          
Maturity Date 2027                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity       $ 3,000,000,000