Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Common Share - Narrative (Details)

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Earnings Per Common Share - Narrative (Details) - shares
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Stock Options          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Average options to purchase shares of common stock (in shares) 3,000,000   18,000,000 6,000,000 24,000,000
Series T Preferred Stock          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Per annum dividend rate     6.00%    
Dilutive Securities          
Incremental common shares attributable to dilutive effect of conversion of preferred stock (in shares)     700,000,000   700,000,000
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) 62,000,000   62,000,000 62,000,000 62,000,000
Warrant          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Shares issued (in shares)     700,000,000    
Common Stock          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Common stock issued in connection with exercise of warrants and exchange of preferred stock (in shares)   700,000,000      
Dilutive Securities          
Incremental common shares attributable to dilutive effect of call options and warrants (in shares) 140,000,000   150,000,000 141,000,000 150,000,000
Common Stock | Warrant          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Average options to purchase shares of common stock (in shares) 122,000,000   122,000,000 122,000,000 122,000,000