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Acquisitions (Purchase Price Allocation) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Business Acquisition [Line Items]    
Goodwill $ 9,198 $ 7,166
Verizon Transaction [Member]    
Business Acquisition [Line Items]    
Current assets 391  
Property, plant and equipment 7,693  
Goodwill 2,032  
Other intangibles - customer list 1,160  
Other assets 89  
Other current liabilities (552)  
Long-term debt (544)  
Other liabilities (383)  
Total net assets acquired $ 9,886