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STOCKHOLDERS' EQUITY - Dividends (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |
Common stock, dividends per share (in dollars per share) | $ 0.98 | $ 0.64 | $ 0.46
Common stock dividends | 471,000,000 | 322,000,000 | 241,000,000
Preferred stock dividends | 29,000,000 | 14,000,000 | 14,000,000
Dividends Declared |  |  |
Class of Stock [Line Items] |  |  |
Common stock dividends | 471,000,000 | 322,000,000 | 241,000,000
Preferred stock dividends | 29,000,000 | 14,000,000 | 14,000,000
Dividends Paid |  |  |
Class of Stock [Line Items] |  |  |
Common stock dividends | 471,000,000 | 322,000,000 | 241,000,000
Preferred stock dividends | 14,000,000 | 14,000,000 | 14,000,000
Series A |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, dividends per share (in dollars per share) | 55.00 | 55.00 | 55.00
Preferred stock dividends | 14,000,000 | 14,000,000 |
Series A | Dividends Declared |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends | 14,000,000 | 14,000,000 | 14,000,000
Series A | Dividends Paid |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends | 14,000,000 | 14,000,000 | 14,000,000
Series B |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, dividends per share (in dollars per share) | 37.00 | 0.00 | 0.00
Preferred stock dividends | 11,000,000 |  |
Series B | Dividends Declared |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends | 11,000,000 | 0 | 0
Series B | Dividends Paid |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends | 0 | 0 | 0
Series C |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, dividends per share (in dollars per share) | 12.57 | 0.00 | 0.00
Preferred stock dividends | 4,000,000 |  |
Series C | Dividends Declared |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends | 4,000,000 | 0 | 0
Series C | Dividends Paid |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends | $ 0 | $ 0 | $ 0

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