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Shareholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 13, 2025
Oct. 06, 2025
Jan. 31, 2025
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Equity [Line Items]                  
Common stock, shares authorized (in shares)       4,000,000,000.00     4,000,000,000.00   4,000,000,000.00
Common stock, par value (in dollars per share)       $ 0.01     $ 0.01   $ 0.01
Nonvoting common stock, par value (in dollars per share)       0.01     $ 0.01   $ 0.01
Shares remitted by employees to satisfy minimum statutory employee tax withholding (in shares)             1,072    
Total value of shares remitted             $ 0.7    
Amount of share-based awards cancelled to satisfy minimum statutory employee tax withholding requirements (in shares)             3,500,000    
Value of share-based awards cancelled to satisfy minimum statutory employee tax withholding requirements             $ 2,160.0    
Dividends declared per common share (in dollars per share)       $ 4.00 $ 3.00   $ 10.00 $ 8.50  
Redemption Value ($ in millions)       $ 15,153.0     $ 15,153.0    
Shares Issued (in shares)       578,282     578,282    
Total preferred stock dividends declared       $ 238.0 $ 192.0   $ 643.0 $ 529.0  
O 2025 Q3 Dividends                  
Equity [Line Items]                  
Dividends payable date declared             Oct. 06, 2025    
Subsequent Event                  
Equity [Line Items]                  
Dividends declared per common share (in dollars per share) $ 4.00                
Subsequent Event | Group Inc.                  
Equity [Line Items]                  
Total preferred stock dividends declared   $ 235.0              
Series A Preferred Stock                  
Equity [Line Items]                  
Redemption Value ($ in millions)       $ 750.0     $ 750.0    
Preferred stock dividends declared (in dollars per share)       $ 335.68 $ 413.68   $ 1,016.67 $ 1,215.99  
Shares Issued (in shares)       30,000     30,000    
Liquidation Preference (in dollars per share)       $ 25,000     $ 25,000    
Basis spread on variable dividend rate             1.01161%    
Total preferred stock dividends declared       $ 9.0 $ 12.0   $ 30.0 $ 36.0  
Series A Preferred Stock | Subsequent Event | Group Inc.                  
Equity [Line Items]                  
Preferred stock dividends declared (in dollars per share)   $ 330.99              
Series C Preferred Stock                  
Equity [Line Items]                  
Redemption Value ($ in millions)       $ 200.0     $ 200.0    
Preferred stock dividends declared (in dollars per share)       $ 335.68 $ 413.68   $ 1,016.67 $ 1,215.99  
Shares Issued (in shares)       8,000     8,000    
Liquidation Preference (in dollars per share)       $ 25,000     $ 25,000    
Basis spread on variable dividend rate             1.01161%    
Total preferred stock dividends declared       $ 2.0 $ 4.0   $ 8.0 $ 10.0  
Series C Preferred Stock | Subsequent Event | Group Inc.                  
Equity [Line Items]                  
Preferred stock dividends declared (in dollars per share)   330.99              
Series D Preferred Stock                  
Equity [Line Items]                  
Redemption Value ($ in millions)       $ 1,350.0     $ 1,350.0    
Preferred stock dividends declared (in dollars per share)       $ 330.63 $ 408.45   $ 1,001.56 $ 1,200.65  
Shares Issued (in shares)       54,000     54,000    
Liquidation Preference (in dollars per share)       $ 25,000     $ 25,000    
Basis spread on variable dividend rate             0.93161%    
Total preferred stock dividends declared       $ 18.0 $ 22.0   $ 54.0 $ 65.0  
Series D Preferred Stock | Subsequent Event | Group Inc.                  
Equity [Line Items]                  
Preferred stock dividends declared (in dollars per share)   325.93              
Series K Preferred Stock                  
Equity [Line Items]                  
Dividend rate           6.375%      
Redemption Value ($ in millions)           $ 700.0      
Preferred stock dividends declared (in dollars per share)             $ 0 $ 796.88  
Total preferred stock dividends declared             $ 0.0 $ 20.0  
Redemption price (in dollars per share)           $ 25,000      
Preferred stock redemption premium           $ 16.0      
Series O Preferred Stock                  
Equity [Line Items]                  
Dividend rate             5.30%    
Redemption Value ($ in millions)       $ 650.0     $ 650.0    
Preferred stock dividends declared (in dollars per share)             $ 662.50 $ 662.50  
Shares Issued (in shares)       26,000     26,000    
Liquidation Preference (in dollars per share)       $ 25,000     $ 25,000    
Total preferred stock dividends declared             $ 17.0 $ 17.0  
Series O Preferred Stock | Subsequent Event | Group Inc.                  
Equity [Line Items]                  
Preferred stock dividends declared (in dollars per share)   662.50              
Series P Preferred Stock                  
Equity [Line Items]                  
Dividend rate         5.00%        
Redemption Value ($ in millions)         $ 1,500.0     $ 1,500.0  
Preferred stock dividends declared (in dollars per share)       $ 0 $ 552.33   $ 0 $ 1,623.09  
Total preferred stock dividends declared       $ 0.0 $ 33.0   $ 0.0 $ 97.0  
Redemption price (in dollars per share)         $ 25,000     $ 25,000  
Preferred stock redemption premium         $ 18.0        
Series T Preferred Stock                  
Equity [Line Items]                  
Dividend rate             3.80%    
Redemption Value ($ in millions)       $ 675.0     $ 675.0    
Preferred stock dividends declared (in dollars per share)             $ 475.00 $ 475.00  
Shares Issued (in shares)       27,000     27,000    
Liquidation Preference (in dollars per share)       $ 25,000     $ 25,000    
Total preferred stock dividends declared             $ 13.0 $ 13.0  
Series T Preferred Stock | Subsequent Event | Group Inc.                  
Equity [Line Items]                  
Preferred stock dividends declared (in dollars per share)   475.00              
Series V Preferred Stock                  
Equity [Line Items]                  
Dividend rate             4.125%    
Redemption Value ($ in millions)       $ 750.0     $ 750.0    
Preferred stock dividends declared (in dollars per share)             $ 515.63 $ 515.63  
Shares Issued (in shares)       30,000     30,000    
Liquidation Preference (in dollars per share)       $ 25,000     $ 25,000    
Total preferred stock dividends declared             $ 15.0 $ 15.0  
Series V Preferred Stock | Subsequent Event | Group Inc.                  
Equity [Line Items]                  
Preferred stock dividends declared (in dollars per share)   515.63              
Series Q Preferred Stock                  
Equity [Line Items]                  
Redemption Value ($ in millions)       $ 500.0     $ 500.0    
Preferred stock dividends declared (in dollars per share)       $ 922.38 $ 687.50   $ 1,844.75 $ 1,375  
Shares Issued (in shares)       20,000     20,000    
Liquidation Preference (in dollars per share)       $ 25,000     $ 25,000    
Basis spread on variable dividend rate             3.623%    
Total preferred stock dividends declared       $ 19.0 $ 14.0   $ 37.0 $ 28.0  
Series R Preferred Stock                  
Equity [Line Items]                  
Redemption Value ($ in millions)       $ 600.0     $ 600.0    
Preferred stock dividends declared (in dollars per share)       $ 945.00 $ 618.75   $ 1,563.75 $ 1,237.5  
Shares Issued (in shares)       24,000     24,000    
Liquidation Preference (in dollars per share)       $ 25,000     $ 25,000    
Basis spread on variable dividend rate             3.224%    
Total preferred stock dividends declared       $ 23.0 $ 15.0   $ 38.0 $ 30.0  
Series S Preferred Stock                  
Equity [Line Items]                  
Redemption Value ($ in millions)       $ 350.0     $ 350.0    
Preferred stock dividends declared (in dollars per share)       $ 898.25 $ 550.00   $ 1,448.25 $ 1,100  
Shares Issued (in shares)       14,000     14,000    
Liquidation Preference (in dollars per share)       $ 25,000     $ 25,000    
Basis spread on variable dividend rate             2.85%    
Total preferred stock dividends declared       $ 12.0 $ 7.0   $ 20.0 $ 15.0  
Series U Preferred Stock                  
Equity [Line Items]                  
Dividend rate             3.65%    
Redemption Value ($ in millions)       $ 750.0     $ 750.0    
Preferred stock dividends declared (in dollars per share)       $ 456.25 $ 456.25   $ 912.50 $ 912.50  
Shares Issued (in shares)       30,000     30,000    
Liquidation Preference (in dollars per share)       $ 25,000     $ 25,000    
Total preferred stock dividends declared       $ 13.0 $ 13.0   $ 27.0 $ 27.0  
Series W Preferred Stock                  
Equity [Line Items]                  
Dividend rate             7.50%    
Redemption Value ($ in millions)       $ 1,500.0     $ 1,500.0    
Preferred stock dividends declared (in dollars per share)       $ 937.50 $ 937.50   $ 1,875 $ 1,833.33  
Shares Issued (in shares)       60,000     60,000    
Liquidation Preference (in dollars per share)       $ 25,000     $ 25,000    
Total preferred stock dividends declared       $ 57.0 $ 56.0   $ 113.0 $ 110.0  
Series E Preferred Stock                  
Equity [Line Items]                  
Redemption Value ($ in millions)       $ 767.0     $ 767.0    
Preferred stock dividends declared (in dollars per share)       $ 1,369.51 $ 1,629.22   $ 4,118.75 $ 4,911.94  
Shares Issued (in shares)       7,667     7,667    
Liquidation Preference (in dollars per share)       $ 100,000     $ 100,000    
Basis spread on variable dividend rate             1.02911%    
Total preferred stock dividends declared       $ 11.0 $ 13.0   $ 32.0 $ 38.0  
Series E Preferred Stock | Subsequent Event | Group Inc.                  
Equity [Line Items]                  
Preferred stock dividends declared (in dollars per share)   1,300.04              
Series F Preferred Stock                  
Equity [Line Items]                  
Redemption Value ($ in millions)       $ 161.0     $ 161.0    
Preferred stock dividends declared (in dollars per share)       $ 1,370.15 $ 1,629.85   $ 4,120.64 $ 4,913.85  
Shares Issued (in shares)       1,615     1,615    
Liquidation Preference (in dollars per share)       $ 100,000     $ 100,000    
Basis spread on variable dividend rate             1.03161%    
Total preferred stock dividends declared       $ 3.0 $ 3.0   $ 7.0 $ 8.0  
Series F Preferred Stock | Subsequent Event | Group Inc.                  
Equity [Line Items]                  
Preferred stock dividends declared (in dollars per share)   1,300.67              
Nonvoting Common Stock                  
Equity [Line Items]                  
Common stock, shares authorized (in shares)       200,000,000     200,000,000   200,000,000
Series X Preferred Stock                  
Equity [Line Items]                  
Dividend rate             7.50%    
Redemption Value ($ in millions)       $ 2,250.0     $ 2,250.0    
Preferred stock dividends declared (in dollars per share)             $ 937.50 $ 0  
Shares Issued (in shares)       90,000     90,000    
Liquidation Preference (in dollars per share)       $ 25,000     $ 25,000    
Total preferred stock dividends declared             $ 84.0 $ 0.0  
Series X Preferred Stock | Subsequent Event | Group Inc.                  
Equity [Line Items]                  
Preferred stock dividends declared (in dollars per share)   937.50              
Series Z Preferred Stock                  
Equity [Line Items]                  
Dividend rate     6.85%       6.85%    
Redemption Value ($ in millions)       $ 1,900.0     $ 1,900.0    
Preferred stock dividends declared (in dollars per share)       $ 932.36 $ 0   $ 932.36 $ 0  
Shares Issued (in shares)     76,000 76,000     76,000    
Liquidation Preference (in dollars per share)       $ 25,000     $ 25,000    
Total preferred stock dividends declared       $ 71.0 $ 0.0   $ 71.0 $ 0.0  
Series Y Preferred Stock                  
Equity [Line Items]                  
Dividend rate             6.125%    
Redemption Value ($ in millions)       $ 2,000.0     $ 2,000.0    
Preferred stock dividends declared (in dollars per share)             $ 952.78 $ 0  
Shares Issued (in shares)       80,000     80,000    
Liquidation Preference (in dollars per share)       $ 25,000     $ 25,000    
Total preferred stock dividends declared             $ 77.0 $ 0.0  
Series Y Preferred Stock | Subsequent Event | Group Inc.                  
Equity [Line Items]                  
Preferred stock dividends declared (in dollars per share)   $ 765.63