Consolidated Statement of Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Series A [Member]
Preferred stock dividends declared per share	$ 951.828	$ 875.00
Series B [Member]
Preferred stock dividends declared per share	218.75	218.75
Series F [Member]
Preferred stock dividends declared per share	406.25	406.25
Series H [Member]
Preferred stock dividends declared per share	321.88	321.88
Series J [Member]
Preferred stock dividends declared per share	662.50	$ 662.50
Series K Preferred Stock [Member]
Preferred stock dividends declared per share	$ 343.75