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SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total unvested share awards 3,441,718     3,441,718    
Number of shares available for grant 61,000,000     61,000,000    
Compensation expense related to share-based plans $ 9,000,000   $ 0 $ 15,000,000 $ 19,000,000  
Share-based compensation not yet recognized $ 24,000,000     $ 24,000,000    
Omnibus Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted       1,108,779    
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%
Percent of compensation eligible to be contributed during first offering period (as a percent)   50.00%        
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