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Goodwill and Intangible Assets (Schedules for Amortization Expense) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Finite Lived Intangible Assets      
Amortization expense for acquired intangible assets $ 236 $ 233 $ 235
Expected amortization expense for acquired intangible assets recorded as of balance sheet date      
2014 214    
2015 200    
2016 186    
2017 171    
2018 154    
After 2018 $ 634