XML 37 R130.htm IDEA: XBRL DOCUMENT v3.19.3
Investments (Investments Under Equity Method of Accounting) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]    
Investment Balance $ 1,278 $ 1,544
Iroquois    
Schedule of Equity Method Investments [Line Items]    
Ownership% [1] 50.00%  
Investment Balance $ 302 311
Description Gas transmission system  
Atlantic Coast Pipeline    
Schedule of Equity Method Investments [Line Items]    
Ownership% 48.00%  
Investment Balance $ 820 382
Description Gas transmission system  
Blue Racer    
Schedule of Equity Method Investments [Line Items]    
Ownership% 50.00%  
Investment Balance   691
Description Midstream gas and related services  
Fowler I Holdings LLC    
Schedule of Equity Method Investments [Line Items]    
Ownership% 50.00%  
Investment Balance $ 82 81
Description Wind-powered merchant generation facility  
Other Investment    
Schedule of Equity Method Investments [Line Items]    
Investment Balance [2] $ 74 79
Dominion Energy Gas Holdings, LLC    
Schedule of Equity Method Investments [Line Items]    
Investment Balance $ 339 349
Dominion Energy Gas Holdings, LLC | Iroquois    
Schedule of Equity Method Investments [Line Items]    
Ownership% 50.00%  
Investment Balance $ 302 311
Description Gas transmission system  
Dominion Energy Gas Holdings, LLC | White Rive Hub    
Schedule of Equity Method Investments [Line Items]    
Ownership% 50.00%  
Investment Balance $ 37 $ 38
Description Gas transmission system  
[1] Comprised of Dominion Energy Midstream’s interest of 25.93% and Dominion Energy Gas’ interest of 24.07%. See Note 15 for more information.
[2] Liability of less than $1 million and $17 million associated with NedPower recorded to other deferred credits and other liabilities, on the Consolidated Balance Sheets as of December 31, 2018 and 2017, respectively. See additional discussion of NedPower below.