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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stock Options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Average options to purchase shares of common stock (in shares) 18 42 24 48
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
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