Related Party Transactions (Schedule of Related Party Payments Under the Tax Sharing Agreement) (Details) (EMC [Member], USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
EMC [Member]
Related Party Transaction [Line Items]
Payment of Income Tax to Related Party	$ 0	$ 0	$ 0	$ 0
Receipt Of Income Tax From Related Party	$ 0	$ 141,000,000	$ 0	$ 176,400,000