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Debt - Narrative (Details)
£ in Billions
9 Months Ended
Apr. 17, 2025
USD ($)
Mar. 08, 2024
USD ($)
Mar. 08, 2024
GBP (£)
Mar. 07, 2024
USD ($)
Mar. 07, 2024
GBP (£)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Jul. 15, 2025
USD ($)
May 01, 2025
USD ($)
Dec. 31, 2024
USD ($)
Debt Instrument                    
Other long-term debt           $ (201,000,000)       $ (228,000,000)
Weighted average interest rate, excluding cross currency interest rate swaps           3.60%        
Debt, weighted average interest rate           2.80%        
Repayments of long-term debt           $ 37,155,000,000 $ 24,183,000,000      
Loss on extinguishment of debt           0 $ 174,000,000      
Difference in carrying value and fair value of long term debt           618,000,000       $ 806,000,000
Revolving Credit Facility                    
Debt Instrument                    
Borrowing capacity remaining           2,400,000,000        
Line of credit facility, capacity backstopped           2,075,000,000        
Commercial Paper                    
Debt Instrument                    
Commercial paper           4,500,000,000        
Credit facility outstanding           50,000,000        
Line of Credit | Revolving Credit Facility                    
Debt Instrument                    
Mandatory principal payment           $ 0        
Line of Credit | Term Facility | Secured Debt                    
Debt Instrument                    
Credit facility outstanding                 $ 8,000,000,000  
Senior Notes                    
Debt Instrument                    
Loss on extinguishment of debt   $ 174,000,000   $ 174,000,000            
Senior Notes | Senior USD Notes                    
Debt Instrument                    
Principle amount of debt               $ 287,000,000    
Interest rates               4.50%    
Repayments of long-term debt   $ 1,500,000,000   $ 1,500,000,000            
Senior Notes | Senior USD Notes | Minimum                    
Debt Instrument                    
Interest rates           1.20%        
Senior Notes | Senior USD Notes | Maximum                    
Debt Instrument                    
Interest rates           5.60%        
Senior Notes | Senior GBP Notes                    
Debt Instrument                    
Repayments of long-term debt | £     £ 1.0   £ 1.0          
Senior Notes | Senior GBP Notes | Minimum                    
Debt Instrument                    
Interest rates           2.30%        
Senior Notes | Senior GBP Notes | Maximum                    
Debt Instrument                    
Interest rates           3.40%        
Senior Notes | Senior Euro Floating Rates Notes | Minimum                    
Debt Instrument                    
Interest rates   2.25% 2.25% 2.25% 2.25%          
Senior Notes | Senior Euro Floating Rates Notes | Maximum                    
Debt Instrument                    
Interest rates   5.625% 5.625% 5.625% 5.625%          
Bridge Loan | Senior Unsecured Bridge Term Loan Facility | Line of Credit                    
Debt Instrument                    
Credit facility outstanding $ 8,000,000,000               $ 0  
Credit facility, expiration period 364 days