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REGULATORY MATTERS - Narrative (Details)
$ in Millions
6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Mar. 13, 2014
subsidiary
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Dividends   $ 333  
Average | Subordinated Debt      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Annual interest burden on debt $ 104    
Bank subsidiaries      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Number of Financial Subsidiaries | subsidiary     2
Reportable legal entities      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Liquid assets $ 383