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Shareholders' Equity - Preferred shares (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 1 Months Ended 4 Months Ended
Jun. 30, 2021
Nov. 30, 2017
Aug. 31, 2017
Nov. 30, 2017
Dec. 31, 2025
Class of Stock [Line Items]          
Preferred shares, par value per share         $ 0.01
Series F Preferred Shares          
Class of Stock [Line Items]          
Preferred shares issued   $ 100 $ 230 $ 330  
Preferred shares, dividend rate (as a percent)       5.45%  
Preferred shares, par value per share   $ 0.01   $ 0.01  
Liquidation preference per share   25,000   25,000  
Preferred shares, redemption price per share   $ 25,000   $ 25,000  
Series F depositary share equivalent          
Class of Stock [Line Items]          
Preference shares, number of shares issued   13.2   13.2  
Proportionate interest of preference shares, per depositary share   0.10%   0.10%  
Liquidation preference per share   $ 25   $ 25  
Preferred shares, redemption price per share   $ 25   $ 25  
Series G Preferred Stock          
Class of Stock [Line Items]          
Preferred shares issued $ 500        
Preferred shares, dividend rate (as a percent) 4.55%        
Preferred shares, par value per share $ 0.01        
Liquidation preference per share 25,000        
Preferred shares, redemption price per share $ 25,000        
Series G depositary share equivalent          
Class of Stock [Line Items]          
Preference shares, number of shares issued 20.0        
Proportionate interest of preference shares, per depositary share 0.10%        
Liquidation preference per share $ 25        
Preferred shares, redemption price per share $ 25