Consolidated Statement of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Retained Earnings [Member]
Common stock per share dividend amount	$ 1.10	$ 1.00	$ 3.30	$ 3.00
Preferred Series A [Member]
Preferred stock per share dividend amount		15.9375		47.8125
Preferred Series C [Member]
Preferred stock per share dividend amount		15.9375		47.8125
Preferred Series E [Member]
Preferred stock per share dividend amount	16.125	16.125	48.375	48.375
Preferred Series F [Member]
Preferred stock per share dividend amount	128.125	$ 128.125	384.375	$ 384.375
Series G Preferred Stock [Member]
Preferred stock per share dividend amount	$ 125.00		$ 375.694