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Debt - Senior Notes and Debentures (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Senior notes: November 2029        
Debt Instrument [Line Items]        
Principal $ 400 $ 400 $ 400  
Interest rate 5.00%      
Senior notes: November 2034        
Debt Instrument [Line Items]        
Principal $ 500 500 $ 500  
Interest rate 5.20%      
Senior notes: July 2030        
Debt Instrument [Line Items]        
Principal $ 500 0   $ 500
Interest rate 4.75%      
Senior notes: March 2035        
Debt Instrument [Line Items]        
Principal $ 700 $ 0   $ 700
Interest rate 5.15%