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REGULATORY MATTERS - Narrative (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Dividend to parent $ 85 $ 145  
RBS
     
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Dividend to parent 751 811 1,200
CBNA
     
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Liquid assets 501    
Average | Subordinated Debt | CBNA
     
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Annual interest burden on debt $ 91