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REGULATORY MATTERS - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Common stock, dividends per share (in dollars per share) |  |  | $ 0.27 | $ 0.27 |  |  |
Preferred stock, issued |  |  | $ 840,000,000 |  | $ 840,000,000 | $ 247,000,000 |
Treasury stock purchased |  |  |  |  | 1,025,000,000 | 820,000,000 | $ 430,000,000
Common stock dividends |  |  |  |  | 471,000,000 | 322,000,000 | 241,000,000
Dividends to preferred stockholders |  |  |  |  | 29,000,000 | 14,000,000 | $ 14,000,000
Forecast |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Common stock, dividends per share (in dollars per share) | $ 0.32 | $ 0.32 |  |  |  |  |
Repurchases of stock | $ 1,020,000,000.00 |  |  |  |  |  |
Series B |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Preferred stock, issued |  |  | 296,000,000 |  | 296,000,000 |  |
Dividends to preferred stockholders |  |  |  |  | 11,000,000 |  |
Series C |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Preferred stock, issued |  |  | 297,000,000 |  | 297,000,000 |  |
Dividends to preferred stockholders |  |  |  |  | 4,000,000 |  |
Series A |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Preferred stock, issued |  |  | 247,000,000 |  | 247,000,000 | 247,000,000 |
Dividends to preferred stockholders |  |  |  |  | 14,000,000 | $ 14,000,000 |
5.158% fixed-to-floating rate subordinated debt, callable, due 2023 |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Debt redeemed |  |  | $ 333,000,000 |  | $ 333,000,000 |  |
Interest rate |  |  | 5.158% |  | 5.158% |  |

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