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
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Stock Options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Average options to purchase shares of common stock (in shares) 7,000,000     30,000,000
Series T Preferred Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Per annum dividend rate     6.00%  
Dilutive Shares        
Incremental common shares attributable to dilutive effect of conversion of preferred stock (in shares)       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
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 Shares        
Incremental common shares attributable to dilutive effect of call options and warrants (in shares) 264,000,000     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