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Acquisitions (Purchase Price Allocation) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 9,507   $ 7,166
Verizon Transaction [Member]      
Business Acquisition [Line Items]      
Current assets 388    
Property, plant and equipment 6,315 $ 7,693  
Goodwill 2,341    
Other intangibles - primarily customer list 2,189 $ 1,160  
Current liabilities (488)    
Long-term debt (544)    
Other liabilities (330)    
Total net assets acquired $ 9,871