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Acquisitions and Dispositions (Schedule of Preliminary Allocation of Purchase Price to Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 16, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Goodwill [1]   $ 6,399 $ 3,294 $ 3,044
Dominion Questar Corporation        
Business Acquisition [Line Items]        
Decrease to goodwill related modifications to preliminary valuation amounts   $ 6    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Total current assets $ 224      
Investments [2] 58      
Property, plant and equipment [3] 4,131      
Goodwill 3,105      
Total deferred charges and other assets, excluding goodwill 75      
Total Assets 7,593      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Total current liabilities [4] 793      
Long-term debt [5] 963      
Deferred income taxes 801      
Regulatory liabilities 259      
Asset retirement obligations 160      
Other deferred credits and other liabilities 220      
Total Liabilities 3,196      
Total estimated purchase price 4,397      
Short-term debt 301      
Dominion Questar Corporation | Short Term Note, Variable Rate, Maturing in February 2017        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Short-term note outstanding $ 250      
Dominion Questar Corporation | Minimum        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Estimated Useful Lives 9 years      
Dominion Questar Corporation | Minimum | Unsecured Senior Notes, Maturities Range from 2017 to 2048 | Unsecured Senior Notes        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Interest rate (percentage) 2.98%      
Dominion Questar Corporation | Maximum        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Estimated Useful Lives 18 years      
Dominion Questar Corporation | Maximum | Unsecured Senior Notes, Maturities Range from 2017 to 2048 | Unsecured Senior Notes        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Interest rate (percentage) 7.20%      
Dominion Questar Corporation | White River Hub, LLC        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Equity method investment $ 40      
[1] Goodwill amounts do not contain any accumulated impairment losses.
[2] Includes $40 million for an equity method investment in White River Hub. The fair value adjustment on the equity method investment in White River Hub is considered to be equity method goodwill and is not amortized.
[3] Nonregulated property, plant and equipment, excluding land, will be depreciated over remaining useful lives primarily ranging from 9 to 18 years.
[4] Includes $301 million of short-term debt, of which no amounts remain outstanding at December 31, 2016, as well as a $250 million term loan which matures in August 2017 and bears interest at a variable rate.
[5] Unsecured senior and medium-term notes have maturities which range from 2017 to 2048 and bear interest at rates from 2.98% to 7.20%.