Consolidated Statements Of Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements Of Equity [Abstract]
Common stock, Cash dividends declared		$ 3.42	$ 6.35
Preferred stock, Cash dividends declared	$ 5.56	$ 11.12	$ 11.12