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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2011
Subsequent Events [Abstract]
Subsequent Events	18. Subsequent Events Line of Credit Expansion On July 27, 2011, we closed on a $2,000,000,000 unsecured revolving credit facility to replace our $1,150,000,000 facility which was scheduled to mature in August 2012. Among other things, the new facility provides us with additional financial flexibility and borrowing capacity and extends our agreement to July 2015. The facility is priced at 1.35% over LIBOR with a 0.25% annual facility fee based on current credit ratings.