Statements of Condensed Consolidated Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statements of Condensed Consolidated Equity
Dividends (in dollars per share)	$ 0.03	$ 0.03
Distributions to noncontrolling interests (in dollars per common unit)	$ 0.46	$ 0.35