Consolidated Statement Of Changes In Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Stockholders' Equity [Abstract]
Dividends (in usd per share)	$ 0.45	$ 0.50	$ 0.90	$ 1.00