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Goodwill and Intangible Assets Amortization Expense (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
2015 $ 710us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 691us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 648us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 600us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 518us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 702us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Net Carrying Amount $ 3,869us-gaap_FiniteLivedIntangibleAssetsNet $ 883us-gaap_FiniteLivedIntangibleAssetsNet