XML 109 R89.htm IDEA: XBRL DOCUMENT v3.8.0.1
Operating Segments (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Virginia Electric and Power Company      
Segment Reporting Information [Line Items]      
Customer settlement $ 16    
Customer settlement, after tax $ 10    
Operating Segments      
Segment Reporting Information [Line Items]      
After- tax net (expenses) benefit   $ (1) $ (22)
Operating Segments | Dominion Energy Gas Holdings, LLC      
Segment Reporting Information [Line Items]      
After- tax net (expenses) benefit     (7)
Write off of regulatory asset   15  
Write off of regulatory asset, after tax   9  
Operating Segments | Decommissioning Trust Fund      
Segment Reporting Information [Line Items]      
Net gain on investments held in nuclear decommissioning trust funds     29
Net gain on investments held in nuclear decommissioning trust funds, after tax     18
Operating Segments | Organizational Design Initiative      
Segment Reporting Information [Line Items]      
Organizational design initiative     59
Organizational design initiative, after tax     36
Operating Segments | Organizational Design Initiative | Virginia Electric and Power Company      
Segment Reporting Information [Line Items]      
Organizational design initiative     33
Organizational design initiative, after tax     20
Operating Segments | Organizational Design Initiative | Dominion Energy Gas Holdings, LLC      
Segment Reporting Information [Line Items]      
Organizational design initiative     8
Organizational design initiative, after tax     5
Operating Segments | Corporate and Other      
Segment Reporting Information [Line Items]      
After- tax net (expenses) benefit   (17) (63)
Operating Segments | Corporate and Other | Virginia Electric and Power Company      
Segment Reporting Information [Line Items]      
After- tax net (expenses) benefit   (7) (18)
Operating Segments | Corporate and Other | Dominion Energy Gas Holdings, LLC      
Segment Reporting Information [Line Items]      
After- tax net (expenses) benefit   (9) 5
Operating Segments | Power Delivery | Virginia Electric and Power Company      
Segment Reporting Information [Line Items]      
Customer settlement   16  
Customer settlement, after tax   $ 10  
Operating Segments | Power Delivery | Organizational Design Initiative      
Segment Reporting Information [Line Items]      
Organizational design initiative, after tax     5
Operating Segments | Power Delivery | Organizational Design Initiative | Virginia Electric and Power Company      
Segment Reporting Information [Line Items]      
Organizational design initiative, after tax     5
Operating Segments | Gas Infrastructure | Organizational Design Initiative      
Segment Reporting Information [Line Items]      
Organizational design initiative, after tax     12
Operating Segments | Power Generation | Organizational Design Initiative      
Segment Reporting Information [Line Items]      
Organizational design initiative, after tax     19
Operating Segments | Power Generation | Organizational Design Initiative | Virginia Electric and Power Company      
Segment Reporting Information [Line Items]      
Organizational design initiative, after tax     $ 15