Annual report pursuant to Section 13 and 15(d)

Earnings Per Common Share - Antidilutive Securities (Details)

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Earnings Per Common Share - Antidilutive Securities (Details) - shares
shares in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock Options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Average options to purchase shares of common stock 66 91 126
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
Common Stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Incremental common shares attributable to dilutive effect of call options and warrants 150 150  
Common Stock | Warrant      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Average options to purchase shares of common stock 122 122 272