Consolidated Statements Of Changes In Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Cash dividends paid on common stock (per share)	$ 0.857	$ 0.816	$ 0.777
Cash dividends paid on preferred stock (per share)	$ 1.500	$ 1.500	$ 0.675
Stock dividend rate (percent)	5.00%	5.00%	5.00%