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Shareholders' Equity (Details) - USD ($)
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Class of Stock [Line Items]    
Gross proceeds $ 1,110,000,000 $ 0
Liquidation preference per share (in dollars per share) $ 25,000  
Series UU Preferred Shares    
Class of Stock [Line Items]    
Shares issued 16,800  
Interest rate 6.625%  
Shares issued (price per share) $ 25,000  
Gross proceeds $ 420,000,000  
Depositary shares 16,800,000  
Net cash proceeds 406,000,000  
Issuance costs $ 14,000,000  
Redemption price per Preferred Share $ 25,000  
Common Shares issued upon conversion 2,773.2  
Series VV Preferred Shares    
Class of Stock [Line Items]    
Shares issued 27,600  
Interest rate 6.00%  
Shares issued (price per share) $ 25,000  
Gross proceeds $ 690,000,000  
Depositary shares 27,600,000  
Net cash proceeds 668,000,000  
Issuance costs $ 22,000,000  
Redemption price per Preferred Share $ 25,000  
Common Shares issued upon conversion 2,584  
Preferred Shares    
Class of Stock [Line Items]    
Liquidation preference per share (in dollars per share) $ 25,000  
Redemption price per Preferred Share $ 25,000  
Redemption price after credit rating downgrade | Series UU Preferred Shares    
Class of Stock [Line Items]    
Redemption price per Preferred Share 25,500  
Redemption price after credit rating downgrade | Series VV Preferred Shares    
Class of Stock [Line Items]    
Redemption price per Preferred Share 25,500  
Redemption price after change in control | Series UU Preferred Shares    
Class of Stock [Line Items]    
Redemption price per Preferred Share 25,000  
Redemption price after change in control | Series VV Preferred Shares    
Class of Stock [Line Items]    
Redemption price per Preferred Share $ 25,000