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Shareholders' Equity - Summary of Dividend Rates of Perpetual Preferred Stock Issued and Outstanding (Detail)
 1 Months Ended 9 Months Ended
Nov. 10, 2034
Feb. 10, 2030
May 10, 2029
Feb. 10, 2029
Nov. 10, 2026
Aug. 10, 2026
May 10, 2026
Jan. 31, 2025
Sep. 30, 2025
Series A Preferred Stock                  
Class of Stock [Line Items]                  
Basis spread on variable dividend rate                 1.01161%
Dividend rate, floor                 3.75%
Series C Preferred Stock                  
Class of Stock [Line Items]                  
Basis spread on variable dividend rate                 1.01161%
Dividend rate, floor                 4.00%
Series D Preferred Stock                  
Class of Stock [Line Items]                  
Basis spread on variable dividend rate                 0.93161%
Dividend rate, floor                 4.00%
Series E Preferred Stock                  
Class of Stock [Line Items]                  
Basis spread on variable dividend rate                 1.02911%
Dividend rate, floor                 4.00%
Series F Preferred Stock                  
Class of Stock [Line Items]                  
Basis spread on variable dividend rate                 1.03161%
Dividend rate, floor                 4.00%
Series O Preferred Stock                  
Class of Stock [Line Items]                  
Dividend rate                 5.30%
Series O Preferred Stock | Forecast                  
Class of Stock [Line Items]                  
Basis spread on variable dividend rate         4.09561%        
Series Q Preferred Stock                  
Class of Stock [Line Items]                  
Basis spread on variable dividend rate                 3.623%
Series R Preferred Stock                  
Class of Stock [Line Items]                  
Basis spread on variable dividend rate                 3.224%
Series S Preferred Stock                  
Class of Stock [Line Items]                  
Basis spread on variable dividend rate                 2.85%
Series T Preferred Stock                  
Class of Stock [Line Items]                  
Dividend rate                 3.80%
Series T Preferred Stock | Forecast                  
Class of Stock [Line Items]                  
Basis spread on variable dividend rate             2.969%    
Series U Preferred Stock                  
Class of Stock [Line Items]                  
Dividend rate                 3.65%
Series U Preferred Stock | Forecast                  
Class of Stock [Line Items]                  
Basis spread on variable dividend rate           2.915%      
Series V Preferred Stock                  
Class of Stock [Line Items]                  
Dividend rate                 4.125%
Series V Preferred Stock | Forecast                  
Class of Stock [Line Items]                  
Basis spread on variable dividend rate         2.949%        
Series W Preferred Stock                  
Class of Stock [Line Items]                  
Dividend rate                 7.50%
Series W Preferred Stock | Forecast                  
Class of Stock [Line Items]                  
Basis spread on variable dividend rate       3.156%          
Series X Preferred Stock                  
Class of Stock [Line Items]                  
Dividend rate                 7.50%
Series X Preferred Stock | Forecast                  
Class of Stock [Line Items]                  
Basis spread on variable dividend rate     2.809%            
Series Y Preferred Stock                  
Class of Stock [Line Items]                  
Dividend rate                 6.125%
Series Y Preferred Stock | Forecast                  
Class of Stock [Line Items]                  
Basis spread on variable dividend rate 2.40%                
Series Z Preferred Stock                  
Class of Stock [Line Items]                  
Dividend rate               6.85% 6.85%
Series Z Preferred Stock | Forecast                  
Class of Stock [Line Items]                  
Basis spread on variable dividend rate   2.461%