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Acquisitions, Dispositions, Goodwill and Other Intangible Assets (Amortization Expense) (Details)
$ in Millions
Jun. 30, 2015
USD ($)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]  
Amortization Expense, Remaining 2015 $ 337
Amortization Expense, 2016 714
Amortization Expense, 2017 745
Amortization Expense, 2018 771
Amortization Expense, 2019 767
Amortization Expense, 2020 $ 777