CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Common stock, per share (in dollars per share)	$ 0.27	$ 0.27
Series I Preferred Stock
Preferred stock, per share (in dollars per share)	414.06	414.06
Series J Preferred Stock
Preferred stock, per share (in dollars per share)	211.50	320.55
Series K Preferred Stock
Preferred stock, per share (in dollars per share)	309.38	309.38
Series L Preferred Stock
Preferred stock, per share (in dollars per share)	281.25
Class B Preferred stock, Series A
Preferred stock, per share (in dollars per share)	$ 15.00	$ 15.00