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STOCKHOLDERS' EQUITY - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |
Dividends declared per share of common stock (in usd per share) | $ 1.56 | $ 1.36 | $ 0.98
Common stock dividends declared and paid | $ 672 | $ 617 | $ 471
Preferred stock dividends declared and paid | 107 | 73 | 29
Dividends Declared |  |  |
Class of Stock [Line Items] |  |  |
Common stock dividends declared and paid | 672 | 617 | 471
Preferred stock dividends declared and paid | 107 | 73 | 29
Dividends Paid |  |  |
Class of Stock [Line Items] |  |  |
Common stock dividends declared and paid | 672 | 617 | 471
Preferred stock dividends declared and paid | $ 98 | $ 65 | $ 14
Series A Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Dividends declared per share of preferred stock (in usd per share) | $ 62.59 | $ 55.00 | $ 55.00
Series A Preferred Stock | Dividends Declared |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends declared and paid | $ 15 | $ 14 | $ 14
Series A Preferred Stock | Dividends Paid |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends declared and paid | $ 13 | $ 14 | $ 14
Series B Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Dividends declared per share of preferred stock (in usd per share) | $ 60.00 | $ 60.00 | $ 37.00
Series B Preferred Stock | Dividends Declared |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends declared and paid | $ 18 | $ 18 | $ 11
Series B Preferred Stock | Dividends Paid |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends declared and paid | $ 18 | $ 20 | $ 0
Series C Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Dividends declared per share of preferred stock (in usd per share) | $ 63.75 | $ 63.75 | $ 12.57
Series C Preferred Stock | Dividends Declared |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends declared and paid | $ 19 | $ 19 | $ 4
Series C Preferred Stock | Dividends Paid |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends declared and paid | $ 19 | $ 18 | $ 0
Series D Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Dividends declared per share of preferred stock (in usd per share) | $ 63.50 | $ 59.45 | $ 0
Series D Preferred Stock | Dividends Declared |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends declared and paid | $ 19 | $ 18 | $ 0
Series D Preferred Stock | Dividends Paid |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends declared and paid | $ 19 | $ 13 | $ 0
Series E Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Dividends declared per share of preferred stock (in usd per share) | $ 50.00 | $ 9.44 | $ 0
Series E Preferred Stock | Dividends Declared |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends declared and paid | $ 23 | $ 4 | $ 0
Series E Preferred Stock | Dividends Paid |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends declared and paid | $ 21 | $ 0 | $ 0
Series F Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Dividends declared per share of preferred stock (in usd per share) | $ 33.27 | $ 0 | $ 0
Series F Preferred Stock | Dividends Declared |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends declared and paid | $ 13 | $ 0 | $ 0
Series F Preferred Stock | Dividends Paid |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock dividends declared and paid | $ 8 | $ 0 | $ 0

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