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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dividends declared - common stock (in dollars per share)   $ 3.00 $ 4.80
Preferred Stock | Preferred Stock, Series D      
Dividends declared - preferred stock (in dollars per share) $ 0.53 2.11 2.11
Preferred Stock | Preferred Stock, Series F      
Dividends declared - preferred stock (in dollars per share) 0.46 1.84 1.84
Preferred Stock | Preferred Stock, Series G      
Dividends declared - preferred stock (in dollars per share) 0.46 1.84 1.84
Preferred Stock | Preferred Stock, Series H      
Dividends declared - preferred stock (in dollars per share) 0.47 1.88 1.88
Preferred Stock | Preferred Stock, Series I      
Dividends declared - preferred stock (in dollars per share) $ 0.47 $ 1.88 $ 1.88