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Cumulative Preferred Stock (Characteristics of the First Preferred Shares) (Details)
 12 Months Ended
Dec. 31, 2019
$ / shares
Dec. 31, 2018
د.إ / shares
Series A Preferred Stock    
Class of Stock [Line Items]    
Initial Yield 4.40%  
Current Annual Dividend $ 0.6388  
Earliest Redemption and/or Conversion Option Date Aug. 15, 2020  
Redemption Value $ 25  
Series A Preferred Stock | Minimum    
Class of Stock [Line Items]    
Initial Yield 1.84%  
Series A Preferred Stock | Maximum    
Class of Stock [Line Items]    
Redemption Value $ 25.5  
Series C Preferred Stock    
Class of Stock [Line Items]    
Initial Yield 4.10%  
Current Annual Dividend | (per share) $ 1.1802 د.إ 1.025
Earliest Redemption and/or Conversion Option Date Aug. 15, 2023  
Redemption Value $ 25  
Series C Preferred Stock | Minimum    
Class of Stock [Line Items]    
Initial Yield 2.65%  
Series C Preferred Stock | Maximum    
Class of Stock [Line Items]    
Redemption Value $ 25.5  
Series F Preferred Stock    
Class of Stock [Line Items]    
Initial Yield 4.25%  
Current Annual Dividend $ 1.0625  
Earliest Redemption and/or Conversion Option Date Feb. 15, 2020  
Redemption Value $ 25  
Series F Preferred Stock | Minimum    
Class of Stock [Line Items]    
Initial Yield 2.63%  
Series F Preferred Stock | Maximum    
Class of Stock [Line Items]    
Redemption Value $ 25.5  
Series B Preferred Stock    
Class of Stock [Line Items]    
Initial Yield 2.393%  
Earliest Redemption and/or Conversion Option Date Aug. 15, 2020  
Redemption Value $ 25  
Series B Preferred Stock | Minimum    
Class of Stock [Line Items]    
Initial Yield 1.84%  
Series H Preferred Stock    
Class of Stock [Line Items]    
Initial Yield 4.90%  
Current Annual Dividend $ 1.225  
Earliest Redemption and/or Conversion Option Date Aug. 15, 2023  
Redemption Value $ 25  
Series H Preferred Stock | Minimum    
Class of Stock [Line Items]    
Initial Yield 4.90%  
Series H Preferred Stock | Maximum    
Class of Stock [Line Items]    
Redemption Value $ 25.5  
Series I Preferred Stock | Minimum    
Class of Stock [Line Items]    
Initial Yield 2.54%  
Perpetual fixed rate Series E Preferred Stock    
Class of Stock [Line Items]    
Initial Yield 4.50%  
Current Annual Dividend $ 1.125  
Redemption Value $ 25.75