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Shareholders' Equity - Summary of Perpetual Preferred Stock Issued and Outstanding (Detail) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 9 Months Ended
Jan. 31, 2025
Sep. 30, 2025
Class of Stock [Line Items]    
Shares Authorized (in shares)   634,500
Shares Issued (in shares)   578,282
Shares Outstanding (in shares)   578,280
Redemption Value ($ in millions)   $ 15,153
Series A Preferred Stock    
Class of Stock [Line Items]    
Shares Authorized (in shares)   50,000
Shares Issued (in shares)   30,000
Shares Outstanding (in shares)   29,999
Depositary Shares Per Share (in shares)   1,000
Liquidation Preference (in dollars per share)   $ 25,000
Redemption Value ($ in millions)   $ 750
Par value on preferred stock (in dollars per share)   $ 0.01
Series C Preferred Stock    
Class of Stock [Line Items]    
Shares Authorized (in shares)   25,000
Shares Issued (in shares)   8,000
Shares Outstanding (in shares)   8,000
Depositary Shares Per Share (in shares)   1,000
Liquidation Preference (in dollars per share)   $ 25,000
Redemption Value ($ in millions)   $ 200
Par value on preferred stock (in dollars per share)   $ 0.01
Series D Preferred Stock    
Class of Stock [Line Items]    
Shares Authorized (in shares)   60,000
Shares Issued (in shares)   54,000
Shares Outstanding (in shares)   53,999
Depositary Shares Per Share (in shares)   1,000
Liquidation Preference (in dollars per share)   $ 25,000
Redemption Value ($ in millions)   $ 1,350
Par value on preferred stock (in dollars per share)   $ 0.01
Series E Preferred Stock    
Class of Stock [Line Items]    
Shares Authorized (in shares)   17,500
Shares Issued (in shares)   7,667
Shares Outstanding (in shares)   7,667
Liquidation Preference (in dollars per share)   $ 100,000
Redemption Value ($ in millions)   $ 767
Par value on preferred stock (in dollars per share)   $ 0.01
Series F Preferred Stock    
Class of Stock [Line Items]    
Shares Authorized (in shares)   5,000
Shares Issued (in shares)   1,615
Shares Outstanding (in shares)   1,615
Liquidation Preference (in dollars per share)   $ 100,000
Redemption Value ($ in millions)   $ 161
Par value on preferred stock (in dollars per share)   $ 0.01
Series O Preferred Stock    
Class of Stock [Line Items]    
Shares Authorized (in shares)   26,000
Shares Issued (in shares)   26,000
Shares Outstanding (in shares)   26,000
Depositary Shares Per Share (in shares)   25
Liquidation Preference (in dollars per share)   $ 25,000
Redemption Value ($ in millions)   $ 650
Par value on preferred stock (in dollars per share)   $ 0.01
Dividend rate   5.30%
Series Q Preferred Stock    
Class of Stock [Line Items]    
Shares Authorized (in shares)   20,000
Shares Issued (in shares)   20,000
Shares Outstanding (in shares)   20,000
Depositary Shares Per Share (in shares)   25
Liquidation Preference (in dollars per share)   $ 25,000
Redemption Value ($ in millions)   $ 500
Par value on preferred stock (in dollars per share)   $ 0.01
Series R Preferred Stock    
Class of Stock [Line Items]    
Shares Authorized (in shares)   24,000
Shares Issued (in shares)   24,000
Shares Outstanding (in shares)   24,000
Depositary Shares Per Share (in shares)   25
Liquidation Preference (in dollars per share)   $ 25,000
Redemption Value ($ in millions)   $ 600
Par value on preferred stock (in dollars per share)   $ 0.01
Series S Preferred Stock    
Class of Stock [Line Items]    
Shares Authorized (in shares)   14,000
Shares Issued (in shares)   14,000
Shares Outstanding (in shares)   14,000
Depositary Shares Per Share (in shares)   25
Liquidation Preference (in dollars per share)   $ 25,000
Redemption Value ($ in millions)   $ 350
Par value on preferred stock (in dollars per share)   $ 0.01
Series T Preferred Stock    
Class of Stock [Line Items]    
Shares Authorized (in shares)   27,000
Shares Issued (in shares)   27,000
Shares Outstanding (in shares)   27,000
Depositary Shares Per Share (in shares)   25
Liquidation Preference (in dollars per share)   $ 25,000
Redemption Value ($ in millions)   $ 675
Par value on preferred stock (in dollars per share)   $ 0.01
Dividend rate   3.80%
Series U Preferred Stock    
Class of Stock [Line Items]    
Shares Authorized (in shares)   30,000
Shares Issued (in shares)   30,000
Shares Outstanding (in shares)   30,000
Depositary Shares Per Share (in shares)   25
Liquidation Preference (in dollars per share)   $ 25,000
Redemption Value ($ in millions)   $ 750
Par value on preferred stock (in dollars per share)   $ 0.01
Dividend rate   3.65%
Series V Preferred Stock    
Class of Stock [Line Items]    
Shares Authorized (in shares)   30,000
Shares Issued (in shares)   30,000
Shares Outstanding (in shares)   30,000
Depositary Shares Per Share (in shares)   25
Liquidation Preference (in dollars per share)   $ 25,000
Redemption Value ($ in millions)   $ 750
Par value on preferred stock (in dollars per share)   $ 0.01
Dividend rate   4.125%
Series W Preferred Stock    
Class of Stock [Line Items]    
Shares Authorized (in shares)   60,000
Shares Issued (in shares)   60,000
Shares Outstanding (in shares)   60,000
Depositary Shares Per Share (in shares)   25
Liquidation Preference (in dollars per share)   $ 25,000
Redemption Value ($ in millions)   $ 1,500
Par value on preferred stock (in dollars per share)   $ 0.01
Dividend rate   7.50%
Series X Preferred Stock    
Class of Stock [Line Items]    
Shares Authorized (in shares)   90,000
Shares Issued (in shares)   90,000
Shares Outstanding (in shares)   90,000
Depositary Shares Per Share (in shares)   25
Liquidation Preference (in dollars per share)   $ 25,000
Redemption Value ($ in millions)   $ 2,250
Par value on preferred stock (in dollars per share)   $ 0.01
Dividend rate   7.50%
Series Y Preferred Stock    
Class of Stock [Line Items]    
Shares Authorized (in shares)   80,000
Shares Issued (in shares)   80,000
Shares Outstanding (in shares)   80,000
Depositary Shares Per Share (in shares)   25
Liquidation Preference (in dollars per share)   $ 25,000
Redemption Value ($ in millions)   $ 2,000
Par value on preferred stock (in dollars per share)   $ 0.01
Dividend rate   6.125%
Series Z Preferred Stock    
Class of Stock [Line Items]    
Shares Authorized (in shares)   76,000
Shares Issued (in shares) 76,000 76,000
Shares Outstanding (in shares)   76,000
Depositary Shares Per Share (in shares)   25
Liquidation Preference (in dollars per share)   $ 25,000
Redemption Value ($ in millions)   $ 1,900
Par value on preferred stock (in dollars per share)   $ 0.01
Dividend rate 6.85% 6.85%