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Goodwill and Specifically Identifiable Intangible Assets (Future estimated amortization of specifically identifiable intangible assets) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Future estimated amortization of specifically identifiable intangible assets [Abstract]  
2015 $ 4us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016 4us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 4us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 4us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 4us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter $ 45us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive