Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Common Share - Antidilutive Securites (Details)

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Earnings Per Common Share - Antidilutive Securites (Details)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Stock Options
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Average options to purchase shares of common stock 88 123 92 127
Series T Preferred Stock | Warrant
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Average options to purchase shares of common stock 700   700  
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 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 272 263 122 272