CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) (USD $)	0 Months Ended	12 Months Ended
	Jan. 25, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF EQUITY
Common dividends, per share (in dollars per share)	$ 0.525	$ 2.00	$ 1.92	$ 1.86