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Debt (Credit Agreements) (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Apr. 30, 2024
Sep. 30, 2025
Dec. 31, 2024
Debt      
Aggregate principal amount outstanding   $ 6,297 $ 6,944
Five-Year Revolving Credit Facility      
Debt      
Commitment fee (as a percent)   0.625%  
Credit facility amount outstanding   $ 0  
Letters of credit issued and outstanding   26  
Credit facility available borrowing capacity   $ 484  
Spread on variable rate basis (as a percent) 0.10% 2.875%  
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:SecuredOvernightFinancingRateSofrMember    
Early maturity trigger, principal due within 91 days $ 325    
Early maturity trigger available cash 250    
Permitted commitment increase $ 250    
Five-Year Revolving Credit Facility | Minimum      
Debt      
Commitment fee (as a percent) 0.375%    
Five-Year Revolving Credit Facility | Maximum      
Debt      
Commitment fee (as a percent) 1.00%    
Five-Year Revolving Credit Facility | June 2028      
Debt      
Borrowing capacity, maximum $ 510