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
Mar. 31, 2016
Mar. 31, 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
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
Stock Options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Average options to purchase shares of common stock (in shares) 53 73