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Acquisitions (Schedule Of Purchase Price Allocation) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill, net $ 7,024 $ 9,674 $ 7,166
CTF Transaction [Member]      
Business Acquisition [Line Items]      
Current assets 353    
Property, plant & equipment 6,096    
Goodwill, net 2,606    
Other intangibles - primarily customer base 2,262 $ 2,162  
Current liabilities (579)    
Long-term debt (544)    
Other liabilities (323)    
Total net assets acquired $ 9,871