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Equity (Terms of Outstanding Preferred Stock) (Details)
12 Months Ended
Sep. 13, 2021
shares
Nov. 01, 2016
shares
May 07, 2013
shares
Apr. 24, 2012
shares
Jul. 27, 2011
shares
Dec. 31, 2021
votingRightPerShare
$ / shares
Series B Preferred Stock            
Debt Instrument [Line Items]            
Preferred stock, dividend rate (in dollars per share) | $ / shares           $ 1.80
Preferred stock, voting rights | votingRightPerShare           8
Series O Preferred Stock            
Debt Instrument [Line Items]            
Number of Depositary Shares Issued and Outstanding         1,000,000  
Fractional Interest in a share of preferred stock represented by each Depositary Share         1.00%  
Preferred stock, dividend rate, percentage         6.75%  
Series P Preferred Stock            
Debt Instrument [Line Items]            
Number of Depositary Shares Issued and Outstanding       60,000,000    
Fractional Interest in a share of preferred stock represented by each Depositary Share       0.025%    
Preferred stock, dividend rate, percentage       6.125%    
Series R Preferred Stock            
Debt Instrument [Line Items]            
Number of Depositary Shares Issued and Outstanding     500,000      
Fractional Interest in a share of preferred stock represented by each Depositary Share     1.00%      
Preferred stock, dividend rate, percentage     4.85%      
Series S Preferred Stock            
Debt Instrument [Line Items]            
Number of Depositary Shares Issued and Outstanding   525,000        
Fractional Interest in a share of preferred stock represented by each Depositary Share   1.00%        
Preferred stock, dividend rate, percentage   5.00%        
Series T Preferred Stock            
Debt Instrument [Line Items]            
Number of Depositary Shares Issued and Outstanding 1,500,000          
Fractional Interest in a share of preferred stock represented by each Depositary Share 1.00%          
Preferred stock, dividend rate, percentage 3.40%          
3-month LIBOR | Series O Preferred Stock            
Debt Instrument [Line Items]            
Basis spread on variable rate - LIBOR Plus         3.678%  
3-month LIBOR | Series P Preferred Stock            
Debt Instrument [Line Items]            
Basis spread on variable rate - LIBOR Plus       4.0675%    
3-month LIBOR | Series R Preferred Stock            
Debt Instrument [Line Items]            
Basis spread on variable rate - LIBOR Plus     3.04%      
3-month LIBOR | Series S Preferred Stock            
Debt Instrument [Line Items]            
Basis spread on variable rate - LIBOR Plus   3.30%        
3-month LIBOR | Series T Preferred Stock            
Debt Instrument [Line Items]            
Basis spread on variable rate - LIBOR Plus 2.595%