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Goodwill and Other Intangible Assets (Expected Amortization Expense for Acquisition-Related Intangible Assets) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remainder of 2015 $ 649us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
2016 791us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 714us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 631us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 522us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 1,073us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Net Carrying Value $ 4,380us-gaap_FiniteLivedIntangibleAssetsNet $ 4,607us-gaap_FiniteLivedIntangibleAssetsNet