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Equity Schedule of Stock by Class - Preferred (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Class of Stock [Line Items]                
Preferred Stock, Shares Outstanding 440,000   440,000     440,000    
Shares outstanding $ 5,424.9 $ 5,848.5 $ 5,424.9 $ 5,848.5 $ 5,661.8 $ 5,986.7 $ 5,976.2 $ 5,750.9
Series A Preferred Stock                
Class of Stock [Line Items]                
Preferred Stock, Liquidation Preference Per Share $ 1,000.00   $ 1,000.00          
Preferred Stock, Shares Outstanding 400,000   400,000          
Dividends Declared Per Share $ 28.25 $ 28.25 $ 56.50 $ 56.50        
Series B Preferred Stock                
Class of Stock [Line Items]                
Preferred Stock, Liquidation Preference Per Share $ 25,000.00   $ 25,000.00          
Preferred Stock, Shares Outstanding 20,000   20,000          
Dividends Declared Per Share $ 406.25 $ 406.25 $ 1,625.00 $ 1,674.65        
Series B-1 Preferred Stock                
Class of Stock [Line Items]                
Preferred Stock, Shares Outstanding 20,000   20,000          
Preferred Stock                
Class of Stock [Line Items]                
Shares outstanding [1] $ 880.0 $ 880.0 $ 880.0 $ 880.0 $ 880.0 880.0 $ 880.0 $ 880.0
Preferred Stock | Series A Preferred Stock                
Class of Stock [Line Items]                
Shares outstanding 393.9   393.9     393.9    
Preferred Stock | Series B Preferred Stock                
Class of Stock [Line Items]                
Shares outstanding $ 486.1   $ 486.1     $ 486.1    
[1] (1)Series A and Series B shares have an aggregate liquidation preference of $400M and $500M, respectively. See Note 5, "Equity" for additional information.