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STOCKHOLDERS' EQUITY - Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Class of Stock [Line Items]        
Dividends declared per share of common stock (in usd per share) $ 0.39 $ 0.39 $ 1.17 $ 1.17
Common stock dividends declared and paid $ 167 $ 168 $ 502 $ 504
Preferred stock dividends declared and paid $ 26 $ 25 $ 81 $ 75
Series A Preferred Stock        
Class of Stock [Line Items]        
Dividends declared per share of preferred stock (in usd per share) $ 0 $ 10.90 $ 20.99 $ 51.88
Series B Preferred Stock        
Class of Stock [Line Items]        
Dividends declared per share of preferred stock (in usd per share) 0 0 30.00 30.00
Series C Preferred Stock        
Class of Stock [Line Items]        
Dividends declared per share of preferred stock (in usd per share) 15.94 15.94 47.81 47.81
Series D Preferred Stock        
Class of Stock [Line Items]        
Dividends declared per share of preferred stock (in usd per share) 15.88 15.88 47.63 47.63
Series E Preferred Stock        
Class of Stock [Line Items]        
Dividends declared per share of preferred stock (in usd per share) 12.50 12.50 37.50 37.50
Series F Preferred Stock        
Class of Stock [Line Items]        
Dividends declared per share of preferred stock (in usd per share) 14.13 19.15 42.38 19.15
Series G Preferred Stock        
Class of Stock [Line Items]        
Dividends declared per share of preferred stock (in usd per share) $ 12.78 $ 0 $ 12.78 $ 0
Dividends Declared        
Class of Stock [Line Items]        
Common stock dividends declared and paid $ 167 $ 168 $ 502 $ 504
Preferred stock dividends declared and paid 26 25 81 75
Dividends Declared | Series A Preferred Stock        
Class of Stock [Line Items]        
Preferred stock dividends declared and paid 0 3 5 13
Dividends Declared | Series B Preferred Stock        
Class of Stock [Line Items]        
Preferred stock dividends declared and paid 0 0 9 9
Dividends Declared | Series C Preferred Stock        
Class of Stock [Line Items]        
Preferred stock dividends declared and paid 5 4 15 14
Dividends Declared | Series D Preferred Stock        
Class of Stock [Line Items]        
Preferred stock dividends declared and paid 5 4 14 14
Dividends Declared | Series E Preferred Stock        
Class of Stock [Line Items]        
Preferred stock dividends declared and paid 6 6 17 17
Dividends Declared | Series F Preferred Stock        
Class of Stock [Line Items]        
Preferred stock dividends declared and paid 6 8 17 8
Dividends Declared | Series G Preferred Stock        
Class of Stock [Line Items]        
Preferred stock dividends declared and paid 4 0 4 0
Dividends Paid        
Class of Stock [Line Items]        
Common stock dividends declared and paid 167 168 502 504
Preferred stock dividends declared and paid 33 28 88 73
Dividends Paid | Series A Preferred Stock        
Class of Stock [Line Items]        
Preferred stock dividends declared and paid 3 3 8 10
Dividends Paid | Series B Preferred Stock        
Class of Stock [Line Items]        
Preferred stock dividends declared and paid 9 9 18 18
Dividends Paid | Series C Preferred Stock        
Class of Stock [Line Items]        
Preferred stock dividends declared and paid 5 5 15 15
Dividends Paid | Series D Preferred Stock        
Class of Stock [Line Items]        
Preferred stock dividends declared and paid 4 5 13 15
Dividends Paid | Series E Preferred Stock        
Class of Stock [Line Items]        
Preferred stock dividends declared and paid 6 6 17 15
Dividends Paid | Series F Preferred Stock        
Class of Stock [Line Items]        
Preferred stock dividends declared and paid 6 0 17 0
Dividends Paid | Series G Preferred Stock        
Class of Stock [Line Items]        
Preferred stock dividends declared and paid $ 0 $ 0 $ 0 $ 0