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REGULATORY MATTERS - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 20, 2016
$ / shares
Jun. 30, 2016
USD ($)
subsidiary
Jun. 30, 2017
$ / shares
Dec. 31, 2016
$ / shares
Jun. 30, 2016
USD ($)
subsidiary
Jun. 30, 2017
Jul. 01, 2016
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]              
Dividends | $   $ 64,000,000     $ 117,000,000    
Banking Subsidiaries              
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]              
Number of financial subsidiaries | subsidiary   2     2    
CBNA subsidiaries              
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]              
Number of financial subsidiaries | subsidiary   2     2    
Scenario, Forecast              
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]              
Dividends declared (in Dollars per Share) | $ / shares     $ 0.14 $ 0.12      
Percentage increase in quarterly dividend           17.00%  
Subsequent Event              
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]              
Dividends declared (in Dollars per Share) | $ / shares $ 0.12            
Share repurchase plan, authorized amount | $             $ 690,000,000