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REGULATORY MATTERS - Narrative (Details)
$ in Millions
12 Months Ended
Aug. 03, 2015
shares
Apr. 07, 2015
shares
Dec. 31, 2015
USD ($)
subsidiary
shares
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Dividends     $ 214
Dividend to preferred stockholders     $ 7
Bank subsidiaries      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Number of financial subsidiaries | subsidiary     2
RBSG      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Treasury stock purchased (in shares) | shares 9,615,384 10,473,397 20,088,781