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, 2017
Mar. 31, 2016
Stock Options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Average options to purchase shares of common stock (in shares) 30 53
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
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