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REGULATORY MATTERS - Narrative (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 29, 2018 USD ($) | May 24, 2018 USD ($) $ / shares shares | Mar. 31, 2019 $ / shares | Sep. 30, 2018 $ / shares | Jun. 30, 2018 USD ($) subsidiary $ / shares | Jun. 30, 2017 USD ($) $ / shares | Jun. 30, 2018 USD ($) subsidiary $ / shares | Jun. 30, 2017 USD ($) $ / shares | Jun. 30, 2019 USD ($) | Dec. 31, 2017 $ / shares
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |  |  |
Common share dividends (in dollars per share) | $ / shares |  |  |  |  | $ 0.22 | $ 0.14 | $ 0.44 | $ 0.28 |  |
Debt redeemed |  |  |  |  |  |  | $ 7,584 | $ 9,751 |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 25.00 |  | $ 25.00 |  |  | $ 25.00
Common share dividends |  |  |  |  | $ 107 | $ 71 | $ 215 | 143 |  |
Preferred share dividends |  |  |  |  | 7 | 7 | 7 | 7 |  |
Treasury stock purchased |  |  |  |  | $ 150 | $ 130 | $ 325 | $ 260 |  |
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 | $ 0.27 |  |  |  |  |  |
Common share repurchases, authorized amount |  |  |  |  |  |  |  |  | $ 1,020 |
5.158% fixed-to-floating rate callable subordinated debt | Subordinated Debt | Parent Company |  |  |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |  |  |
Debt redeemed | $ 333 |  |  |  |  |  |  |  |  |
Interest rate | 5.158% |  |  |  |  |  |  |  |  |
Noncumulative Preferred Stock |  |  |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock issued (in shares) | shares |  | 300,000 |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  | 6.00% |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  | $ 25 |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares |  | $ 1,000 |  |  |  |  |  |  |  |
Carrying amount of preferred stock |  | $ 296 |  |  |  |  |  |  |  |

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