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STOCKHOLDERS' EQUITY - Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Class of Stock [Line Items]    
Dividends declared per share of common stock (in usd per share) $ 0.39 $ 0.39
Common stock dividends declared and paid $ 167 $ 168
Preferred stock dividends declared and paid $ 23 $ 22
Series A Preferred Stock    
Class of Stock [Line Items]    
Dividends declared per share of preferred stock (in usd per share) $ 10.49 $ 27.50
Series B Preferred Stock    
Class of Stock [Line Items]    
Dividends declared per share of preferred stock (in usd per share) 0 0
Series C Preferred Stock    
Class of Stock [Line Items]    
Dividends declared per share of preferred stock (in usd per share) 15.94 15.94
Series D Preferred Stock    
Class of Stock [Line Items]    
Dividends declared per share of preferred stock (in usd per share) 15.88 15.88
Series E Preferred Stock    
Class of Stock [Line Items]    
Dividends declared per share of preferred stock (in usd per share) 12.50 12.50
Series F Preferred Stock    
Class of Stock [Line Items]    
Dividends declared per share of preferred stock (in usd per share) $ 14.13 $ 0
Dividends Declared    
Class of Stock [Line Items]    
Common stock dividends declared and paid $ 167 $ 168
Preferred stock dividends declared and paid 23 22
Dividends Declared | Series A Preferred Stock    
Class of Stock [Line Items]    
Preferred stock dividends declared and paid 3 7
Dividends Declared | Series B Preferred Stock    
Class of Stock [Line Items]    
Preferred stock dividends declared and paid 0 0
Dividends Declared | Series C Preferred Stock    
Class of Stock [Line Items]    
Preferred stock dividends declared and paid 5 5
Dividends Declared | Series D Preferred Stock    
Class of Stock [Line Items]    
Preferred stock dividends declared and paid 5 5
Dividends Declared | Series E Preferred Stock    
Class of Stock [Line Items]    
Preferred stock dividends declared and paid 5 5
Dividends Declared | Series F Preferred Stock    
Class of Stock [Line Items]    
Preferred stock dividends declared and paid 5 0
Dividends Paid    
Class of Stock [Line Items]    
Common stock dividends declared and paid 167 168
Preferred stock dividends declared and paid 32 23
Dividends Paid | Series A Preferred Stock    
Class of Stock [Line Items]    
Preferred stock dividends declared and paid 3 0
Dividends Paid | Series B Preferred Stock    
Class of Stock [Line Items]    
Preferred stock dividends declared and paid 9 9
Dividends Paid | Series C Preferred Stock    
Class of Stock [Line Items]    
Preferred stock dividends declared and paid 5 5
Dividends Paid | Series D Preferred Stock    
Class of Stock [Line Items]    
Preferred stock dividends declared and paid 5 5
Dividends Paid | Series E Preferred Stock    
Class of Stock [Line Items]    
Preferred stock dividends declared and paid 5 4
Dividends Paid | Series F Preferred Stock    
Class of Stock [Line Items]    
Preferred stock dividends declared and paid $ 5 $ 0