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Goodwill and Intangible Assets (Schedules for Amortization Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Finite Lived Intangible Asset        
Amortization expense for acquired intangible assets $ 66 $ 56 $ 169 $ 170
Expected amortization expense for acquired intangible assets recorded as of balance sheet date        
Remainder of 2015 71   71  
2016 273   273  
2017 247   247  
2018 226   226  
2019 213   213  
2020 203   203  
After 2020 $ 1,283   $ 1,283