SHARE-BASED COMPENSATION - Share Based Compensation Activity (Details) (USD $)	3 Months Ended		9 Months Ended			1 Months Ended				9 Months Ended	3 Months Ended	1 Months Ended	9 Months Ended		1 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Restricted Stock Units	Mar. 31, 2014 Restricted Stock Units or Convertible Bonds Percent Vesting in March 2016	Mar. 31, 2014 Restricted Stock Units or Convertible Bonds Percent Vesting in March 2017	Mar. 31, 2014 Restricted Stock Units Restricted Stock Units or Convertible Bonds Percent Vesting in March 2016	Mar. 31, 2014 Restricted Stock Units Restricted Stock Units or Convertible Bonds Percent Vesting in March 2017	Sep. 30, 2014 Employee Stock Purchase Plan Common Stock	Dec. 31, 2014 Employee Stock Purchase Plan Common Stock Forecast	Sep. 30, 2014 RBSG Restricted Stock Units	Sep. 30, 2014 RBSG Restricted Stock Units	Sep. 30, 2013 RBSG Restricted Stock Units	Sep. 30, 2014 Citizens Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage						50.00%	50.00%	50.00%	50.00%
Conversion period			30 days
Shares granted													9,627,635	6,363,919
Grant date fair value of shares granted													$ 53,000,000	$ 30,000,000
Shares converted												19,055,349			5,158,928
Shares issued upon conversion of IPO award bonds															524,783
Total unvested share awards					5,706,624
Compensation expense related to share-based plans	10,000,000	9,000,000	29,000,000	24,000,000
Purchase date, Discount from market price										10.00%
Percent of compensation eligible to be contributed (as a percent)										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