Consolidated Statements of Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Parent Company [Member]
Common Stock, Dividends, Per Share, Declared	$ 3.3300	$ 3.1300	$ 2.9600
Distribution Made to Limited Partner, Distributions Declared, Per Unit	3.3300	3.1300	2.9600
Limited Partner [Member]
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 3.3300	$ 3.1300	$ 2.9600