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SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total unvested share awards 3,363,665   3,363,665    
Number of shares available for grant 60,893,195   60,893,195    
Compensation expense related to share-based plans $ 7,000,000 $ 10,000,000 $ 22,000,000 $ 29,000,000  
Share-based compensation not yet recognized $ 17,000,000   $ 17,000,000    
Omnibus Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted     1,118,513    
Aggregate grant date fair value     $ 28,000,000    
Directors Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted     31,438    
Aggregate grant date fair value     $ 1,000,000    
Following IPO | Employee Stock Purchase Plan | Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Purchase date, Discount from market price     10.00%    
Percent of compensation eligible to be contributed (as a percent) 10.00%   10.00%    
Amount of compensation eligible to be contributed     $ 25,000    
Time-based restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Performance shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Restricted Stock Units or Convertible Bonds | Prior to IPO | Percent Vesting in March 2016          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage     50.00%    
Restricted Stock Units or Convertible Bonds | Prior to IPO | Percent Vesting in March 2017          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage     50.00%    
Special IPO Awards | Prior to IPO          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Conversion period         30 days
Restricted Stock Units (RSUs) | RBSG          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares converted         19,390,752
Restricted Stock Units (RSUs) | Citizens          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares converted         5,249,721
Shares issued upon conversion of IPO award bonds         524,783
Material Risk Taker Shares | Omnibus Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Retention period, minimum     3 years    
Retention period, maximum     5 years