Consolidated Statement of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Common stock dividends, share	$ 0.42	$ 0.42	$ 0.84	$ 0.84
Series A [Member]
Preferred stock dividends declared per share	884.722	884.722	1,759.722	1,769.444
Series B [Member]
Preferred stock dividends declared per share	221.181	221.18	439.931	442.36
Series F [Member]
Preferred stock dividends declared per share	406.25	406.25	812.50	812.50
Series H [Member]
Preferred stock dividends declared per share		321.88		643.76
Series I [Member]
Preferred stock dividends declared per share		640.625	232.953	640.625
Series J [Member]
Preferred stock dividends declared per share			662.50	662.50
Series K [Member]
Preferred stock dividends declared per share	343.75	$ 343.75	687.50	$ 687.50
Series L [Member]
Preferred stock dividends declared per share	234.375		468.75
Series M [Member]
Preferred stock dividends declared per share	$ 250.00		$ 452.778