Quarterly report pursuant to Section 13 or 15(d)

SHAREHOLDERS' EQUITY (Details)

v3.8.0.1
SHAREHOLDERS' EQUITY (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Aug. 16, 2016
Mar. 31, 2018
Feb. 27, 2018
Feb. 22, 2018
Dec. 31, 2017
Equity, Class of Treasury Stock [Line Items]          
Preferred Stock, Shares Outstanding   740,500     1,098,006
Preferred Stock, Value, Outstanding   $ 1,203      
Preferred Stock, Value, Issued   $ 1,203     $ 1,071
Series A Preferred Stock [Member]          
Equity, Class of Treasury Stock [Line Items]          
Preferred Stock, Dividend Payment Rate, Variable   .0850      
Series B Preferred Stock [Member]          
Equity, Class of Treasury Stock [Line Items]          
Preferred Stock, Shares Outstanding   35,500      
Preferred Stock, Value, Outstanding   $ 23      
Preferred Stock, Dividend Payment Rate, Variable   3-mo. LIBOR + 270 bps      
Preferred Stock, Redemption Date   Jan. 15, 2017      
Common Stock [Member]          
Equity, Class of Treasury Stock [Line Items]          
Share Price       $ 15.73  
Preferred Class A [Member]          
Equity, Class of Treasury Stock [Line Items]          
Convertible Preferred Stock, Threshold Percentage of Stock Price Trigger   130.00%      
Convertible Preferred Stock Threshold of Stock Price Trigger       $ 11.95  
Convertible Preferred Stock, Shares Issued upon Conversion       83.668  
Series C Preferred Stock          
Equity, Class of Treasury Stock [Line Items]          
Preferred Stock, Shares Outstanding   100,000      
Preferred Stock, Value, Outstanding   $ 100      
Preferred Stock, Dividend Payment Rate, Variable   .05875      
Preferred Stock, Redemption Date   Jan. 15, 2022      
Preferred Stock, Redemption Period 90 days        
Series E Preferred Stock [Member]          
Equity, Class of Treasury Stock [Line Items]          
Preferred Stock, Liquidation Preference Per Share     $ 100,000    
Depositary Shares, Liquidation Preference Per Share     $ 1,000    
Preferred Stock, Shares Outstanding   5,000      
Preferred Stock, Value, Outstanding   $ 495      
Preferred Stock, Dividend Payment Rate, Variable   0.057      
Preferred Stock, Value, Issued     $ 500    
Depositary Shares, Issued   500,000      
Preferred Stock, Par or Stated Value Per Share     $ 0.01    
Payments of Stock Issuance Costs   $ 5      
Preferred Stock, Redemption Date   Apr. 15, 2023      
Series D Preferred Stock          
Equity, Class of Treasury Stock [Line Items]          
Preferred Stock, Shares Outstanding   400,000      
Preferred Stock, Value, Outstanding   $ 386      
Preferred Stock, Dividend Payment Rate, Variable   .0625      
Preferred Stock, Redemption Date   Jul. 15, 2021      
Series D Preferred Stock2 [Member]          
Equity, Class of Treasury Stock [Line Items]          
Preferred Stock, Shares Outstanding   200,000      
Preferred Stock, Value, Outstanding   $ 199