Annual report pursuant to Section 13 and 15(d)

SHAREHOLDERS' EQUITY - Preferred Stock Issued and Outstanding (Details)

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SHAREHOLDERS' EQUITY - Preferred Stock Issued and Outstanding (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Mar. 31, 2012
Dec. 31, 2018
USD ($)
$ / shares
shares
Feb. 27, 2018
USD ($)
$ / shares
Feb. 22, 2018
shares
Dec. 31, 2017
USD ($)
shares
Class of Stock [Line Items]            
Preferred Stock, Shares Outstanding | shares     740,500     1,098,006
Preferred Stock, Value, Outstanding     $ 1,203      
Preferred Stock, Value, Issued     $ 1,203     $ 1,071
Preferred Stock            
Class of Stock [Line Items]            
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares     $ 1,000      
Series A Preferred Stock            
Class of Stock [Line Items]            
Preferred stock, dividend percentage 0.085   0.085      
Preferred Class A [Member]            
Class of Stock [Line Items]            
Number of shares issued for each share of convertible preferred stock | shares         83.668  
Series B Preferred Stock            
Class of Stock [Line Items]            
Preferred Stock, Shares Outstanding | shares     35,500      
Preferred Stock, Value, Outstanding     $ 23      
Preferred stock, dividend percentage     3-mo. LIBOR + 270 bps      
Preferred Stock, Redemption Date     Jan. 15, 2017      
Depository share, percent interest in preferred stock   0.025        
Series D Preferred Stock            
Class of Stock [Line Items]            
Preferred Stock, Shares Outstanding | shares     400,000      
Preferred Stock, Value, Outstanding     $ 386      
Preferred stock, dividend percentage     0.0625      
Preferred Stock, Redemption Date     Jul. 15, 2021      
Series D Preferred Stock2            
Class of Stock [Line Items]            
Preferred Stock, Shares Outstanding | shares     200,000      
Preferred Stock, Value, Outstanding     $ 199      
Preferred stock, dividend percentage     0.0625      
Preferred Stock, Redemption Date     Jul. 15, 2021      
Series C Preferred Stock            
Class of Stock [Line Items]            
Preferred Stock, Shares Outstanding | shares     100,000      
Preferred Stock, Value, Outstanding     $ 100      
Preferred stock, dividend percentage     0.05875      
Preferred Stock, Redemption Date     Jan. 15, 2022      
Series E Preferred Stock [Member]            
Class of Stock [Line Items]            
Preferred Stock, Shares Outstanding | shares     5,000      
Preferred Stock, Value, Outstanding     $ 495      
Preferred stock, dividend percentage     0.057      
Preferred Stock, Par or Stated Value Per Share | $ / shares       $ 0.01    
Preferred Stock, Redemption Date     Apr. 15, 2023      
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares       100,000    
Payments of Stock Issuance Costs     $ 5      
Depositary Shares, Liquidation Preference Per Share | $ / shares       $ 1,000    
Preferred Stock, Value, Issued       $ 500    
Depositary Shares, Issued | shares     500,000