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Shareholders' Equity (Narrative) (Details)
 3 Months Ended 9 Months Ended
Aug. 04, 2022
$ / shares
Jan. 13, 2022
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
$ / shares
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2022
USD ($)
dividend
board_member
$ / shares
Sep. 30, 2021
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
Class of Stock [Line Items]              
Number of quarterly dividends in arrearage before preferred shareholders can elect additional board members | dividend         6    
Number of additional board members the preferred shareholders can elect in the case of an excess arrearage of quarterly dividends | board_member         2    
Amount of preferred dividends in arrears         $ 0    
Affirmative vote of outstanding shares of a series of Preferred Shares required for any material and adverse amendment to the terms of series, percent         66.67%    
Affirmative vote of outstanding shares of all Preferred Shares, voting as a single class, required to issue shares ranking senior to Preferred Shares, percent         66.67%    
Redemption price per share (in USD per share) | $ / shares     $ 25.00   $ 25.00    
Liquidation Preference     $ 4,350,000,000   $ 4,350,000,000   $ 4,100,000,000
Common stock dividends paid in aggregate     $ 2,700,000,000 $ 351,200,000 $ 3,400,000,000 $ 1,050,000,000.00  
Distributions to common shareholders and restricted share unitholders (in USD per share) | $ / shares     $ 15.15 $ 2.00 $ 19.15 $ 6.00  
Preferred share dividends     $ 48,678,000 $ 46,237,000 $ 145,716,000 $ 138,500,000  
Special Dividend              
Class of Stock [Line Items]              
Common stock dividends paid in aggregate     2,300,000,000   $ 2,300,000,000    
Common stock, dividends, per share, cash paid (in USD per share) | $ / shares $ 13.15            
Series S Preferred Stock              
Class of Stock [Line Items]              
Stock issued during period (in shares) | shares   10,000,000          
Preferred shares per depositary share (in shares) | shares   0.001          
Dividend rate percentage   4.10%     4.10%    
Shares issued (in USD per share) | $ / shares   $ 25.00          
Liquidation Preference   $ 250,000,000 $ 250,000,000   $ 250,000,000   $ 0
Issuance costs   $ 7,200,000