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Goodwill And Other Intangibles (Estimated Future Aggregate Amortization Expense) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
2015 (excludes amortization through March 31, 2015) $ 66us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
2016 77us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 74us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 72us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 73us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Subsequent years 310us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Net Carrying Amount $ 672us-gaap_FiniteLivedIntangibleAssetsNet $ 692us-gaap_FiniteLivedIntangibleAssetsNet