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REGULATORY MATTERS - Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Apr. 05, 2018
$ / shares
Mar. 31, 2019
$ / shares
Sep. 30, 2018
USD ($)
subsidiary
$ / shares
Sep. 30, 2017
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
subsidiary
$ / shares
Sep. 30, 2017
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]              
Common share dividends (in dollars per share) | $ / shares $ 0.22   $ 0.27 $ 0.18 $ 0.71 $ 0.46  
Common share dividends     $ 129 $ 90 $ 344 $ 233  
Preferred share dividends     7 7 14 14  
Treasury stock purchased     $ 400 $ 225 $ 725 $ 485  
Banking 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]              
Common share dividends (in dollars per share) | $ / shares   $ 0.32          
Common share repurchases, authorized amount             $ 1,020