Consolidated Statement of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Common stock dividends, share	$ 0.42	$ 0.37
Series A [Member]
Preferred stock dividends declared per share	884.722	951.828
Series B [Member]
Preferred stock dividends declared per share	221.18	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 [Member]
Preferred stock dividends declared per share	$ 343.75	$ 343.75