Quarterly report pursuant to Section 13 or 15(d)

Nature Of Business (Details)

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Nature Of Business (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 3 Months Ended 9 Months Ended
Sep. 02, 2011
Sep. 30, 2011
Sep. 30, 2011
Aug. 05, 2011
Nature Of Business [Abstract]        
Percentage of distribution of ordinary taxable income     90.00%  
Number of purchase and sale agreements entered   5 5 5
Number of office assets       2
Aggregate purchase price     $ 350  
Number of purchase and sale agreements closed on September 2, 2011 3      
Number of remaining purchase and sale agreements closed at end of period   2 2  
Proceeds from sale of real estate 236      
Gain on sale of real estate   $ 57