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Acquisitions (Purchase Price Allocation) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]    
Goodwill $ 7,166 $ 7,205
Connecticut Operations [Member]    
Business Acquisition [Line Items]    
Current assets 69  
Property, plant and equipment 1,459  
Goodwill 815  
Other intangibles - customer list 570  
Current liabilities (94)  
Deferred income taxes (576)  
Other liabilities (225)  
Total net assets acquired $ 2,018