Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Common Share - Antidilutive Securities (Details)

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Earnings Per Common Share - Antidilutive Securities (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Series L Preferred Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Preferred stock dividend rate     7.25%  
Warrant        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Average options to purchase shares of common stock (in shares) 122 122 122 122
Warrant | Series T Preferred Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Average options to purchase shares of common stock (in shares)     700  
Convertible Preferred Stock Subject to Mandatory Redemption | Series L Preferred Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Average options to purchase shares of common stock (in shares) 62 62 62 62
Stock Options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Average options to purchase shares of common stock (in shares) 42 64 46 67