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Goodwill and Other Intangible Assets (Expected Amortization Expense for Acquisition-Related Intangible Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remainder of 2015 $ 215  
2016 804  
2017 727  
2018 640  
2019 530  
Thereafter 1,107  
Net Carrying Value $ 4,023 $ 4,607