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Goodwill and Intangible Assets (Schedules for Amortization Expense) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Finite Lived Intangible Assets      
Amortization expense for acquired intangible assets $ 228us-gaap_AmortizationOfIntangibleAssets $ 236us-gaap_AmortizationOfIntangibleAssets $ 233us-gaap_AmortizationOfIntangibleAssets
Expected amortization expense for acquired intangible assets recorded as of balance sheet date      
2015 204us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
2016 176us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
2017 154us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
2018 139us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
2019 128us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
After 2019 $ 511us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive