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Goodwill and Intangible Assets (Schedules for Amortization Expense) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Finite Lived Intangible Assets    
Amortization expense for acquired intangible assets $ 57 $ 60
Expected amortization expense for acquired intangible assets recorded as of balance sheet date    
Remainder of 2014 161  
2015 201  
2016 188  
2017 172  
2018 156  
2019 144  
After 2019 $ 480