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Long-Term Debt and Credit Agreements - Schedule of Long-term Debt (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]        
Total debt     $ 3,500,000,000 $ 2,075,000,000
Unamortized debt premium     69,000,000 90,000,000
Unamortized debt discount     (10,000,000) 0
Unamortized debt issuance costs     (24,000,000) (4,000,000)
Total debt     3,535,000,000 2,161,000,000
Less: current portion of long-term debt     0 575,000,000
Long-term debt     $ 3,535,000,000 1,586,000,000
Senior Notes | 3.65% weighted-average private placement senior notes        
Debt Instrument [Line Items]        
Weighted-average interest rate     3.65%  
Total debt     $ 250,000,000 825,000,000
Amount of principal repurchased   $ 575,000,000    
Debt instrument, interest rate during period     3.77%  
Senior Notes | 3.65% weighted-average private placement senior notes | Scenario Forecast        
Debt Instrument [Line Items]        
Amount of principal repurchased $ 250,000,000      
Senior Notes | 3.90% senior notes due May 15, 2027        
Debt Instrument [Line Items]        
Stated percentage     3.90%  
Total debt     $ 750,000,000 750,000,000
Senior Notes | 4.375% senior notes due March 15, 2029        
Debt Instrument [Line Items]        
Stated percentage     4.375%  
Total debt     $ 500,000,000 500,000,000
Senior Notes | 5.60% senior notes due March 15, 2034        
Debt Instrument [Line Items]        
Stated percentage     5.60%  
Total debt     $ 500,000,000 0
Senior Notes | 5.40% senior notes due February 15, 2035        
Debt Instrument [Line Items]        
Stated percentage     5.40%  
Total debt     $ 750,000,000 0
Senior Notes | 5.90% senior notes due February 15, 2055        
Debt Instrument [Line Items]        
Stated percentage     5.90%  
Total debt     $ 750,000,000 $ 0
Revolving credit agreement | Revolving Credit Agreement        
Debt Instrument [Line Items]        
Total debt     $ 0