Consolidated Statement Of Changes In Equity (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Common Stock, Dividends, Per Share, Cash Paid	$ 1.125	$ 1.125	$ 1.125	$ 1.08	$ 1.08	$ 1.08
Series C Preferred Shares [Member]
Dividends	0.359375	0.359375	0.359375	0.359375	0.359375	0.359375
Series E Preferred Shares [Member]
Dividends	0.5625	0.5625	0.5625	0.5625	0.5625	0.5625
Series G Preferred Stock [Member]
Dividends	$ 0.359375	$ 0.359375	$ 0.359375	$ 0.359375	$ 0.359375	$ 0.359375