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Intangible Assets and Goodwill (Estimated Future Annual Amortization Expense for Intangible Assets) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Intangible Assets and Goodwill [Abstract]    
2015 $ 45us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 37us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 34us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 31us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 29us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 51us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Total intangible assets $ 227us-gaap_FiniteLivedIntangibleAssetsNet $ 266us-gaap_FiniteLivedIntangibleAssetsNet