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Changes in Capital Structure - Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Class of Stock [Line Items]        
Dividends per Series A Preferred Stock (in usd per share) $ 51.25 $ 51.25 $ 51.25 $ 51.25
Series A Preferred Stock dividends $ 33 [1] $ 33 [1] $ 33 [2] $ 33 [2]
Series A Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, dividends declared (in usd per share) $ 51.25 $ 51.25   $ 51.25
Dividends per Series A Preferred Stock (in usd per share) $ 51.25 $ 51.25 $ 51.25  
Series A Preferred Stock dividends $ 33 $ 33    
Series A Preferred Stock | Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, dividend rate, percentage 10.25% 10.25%    
[1] Semi-annual dividend per share of Series A Preferred Stock was $51.25 for the periods ended September 15 and March 15, 2025
[2] Semi-annual dividend per share of Series A Preferred Stock was $51.25 for the period ended September 15 and March 15, 2024