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Goodwill And Acquired Intangible Assets (Schedule of the Aggregate Amortization Expense for Identifiable Intangible Assets) (Details) (USD $)
In Millions
6 Months Ended
Jun. 30, 2011
Goodwill And Acquired Intangible Assets  
Amortization expense - Actual 2011 $ 12
Amortization expense - 2011 29
Amortization expense - 2012 36
Amortization expense - 2013 35
Amortization expense - 2014 35
Amortization expense - 2015 $ 33