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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Stock Options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Average options to purchase shares of common stock (in shares) 64 89 68 95
Series T Preferred Stock | Warrant        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Average options to purchase shares of common stock (in shares)       700
Series L Preferred Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Preferred stock dividend rate     7.25%  
Series L Preferred Stock | Convertible Preferred Stock Subject to Mandatory Redemption        
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
Common Stock | 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