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Acquisitions and Dispositions (Schedule of Preliminary Allocation of Purchase Price to Assets Acquired and Liabilities Assumed) (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 16, 2016
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Goodwill [1] $ 6,410 $ 6,405 $ 6,399  
SCANA        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Total current assets 1,756      
Investments 213      
Property, plant and equipment, net 10,982      
Goodwill 2,438      
Regulatory assets 4,219      
Other deferred charges and other assets, including intangible assets 314      
Total Assets 19,922      
Total current liabilities 1,506      
Long-term debt 6,707      
Deferred income taxes 1,097      
Regulatory liabilities 2,664      
Other deferred credits and other liabilities 1,109      
Total Liabilities 13,083      
Total purchase price $ 6,839      
Dominion Energy Questar Corporation        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Total current assets       $ 224
Investments [2]       58
Property, plant and equipment, net [3]       4,131
Goodwill       3,111
Other deferred charges and other assets, including intangible assets       75
Total Assets       7,599
Total current liabilities [4]       793
Long-term debt [5]       963
Deferred income taxes       807
Regulatory liabilities       259
Other deferred credits and other liabilities       220
Total Liabilities       3,202
Total purchase price       4,397
Asset retirement obligations       $ 160
[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, 2018, as well as a $250 million variable interest rate term loan due in August 2017 that was paid in July 2017.
[5] Unsecured senior and medium-term notes with maturities which range from 2017 to 2048 and bear interest at rates from 2.98% to 7.20%.