Subsequent Events (Tables)

9 Months Ended

Sep. 30, 2012

Subsequent Events [Abstract]

Schedule of Dividends Declared

Class of stock/units	Quarterly Amount per Share or Unit	Record Date	Payment Date
Common	$0.17	November 14, 2012	November 30, 2012
Preferred (per depositary share or unit):
Series J	$0.414063	November 14, 2012	November 30, 2012
Series K	$0.406250	November 14, 2012	November 30, 2012
Series L	$0.412500	November 14, 2012	November 30, 2012
Series O	$0.523437	December 17, 2012	December 31, 2012