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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Changes to Asset Retirement Obligations
The changes to AROs during 2018 and 2019 were as follows:
 
Amount
 
(millions)
 
 
Dominion Energy
 
 
 
AROs at December 31, 2017
   $
2,432
 
Obligations incurred during the period
   
20
 
Obligations settled during the period
   
(159
 )
Revisions in estimated cash flows
(2)
    
120
 
Accretion
   
119
 
AROs at December 31, 2018
(1)
   $
2,532
 
Obligations incurred during the period
(2)
  
 
2,413
 
Obligations settled during the period
 
 
(137
)
AROs acquired in the SCANA Combination
 
 
577
 
Revisions in estimated cash flows
(3)
  
 
(324
)
Accretion
 
 
213
 
AROs at December 31, 2019
(1)
  
$
5,274
 
Virginia Power
 
 
 
AROs at December 31, 2017
  $
1,365
 
Obligations incurred during the period
   
14
 
Obligations settled during the period
   
(119
 )
Revisions in estimated cash flows
(2)
    
120
 
Accretion
   
65
 
AROs at December 31, 2018
  $
1,445
 
Obligations incurred during the period
(
2
)
  
 
2,408
 
Obligations settled during the period
 
 
(81
)
Revisions in estimated cash flows
(3)
  
 
(323
)
Accretion
 
 
132
 
AROs at December 31, 2019
 
$
3,581
 
Dominion Energy Gas
 
 
 
AROs at December 31, 2017
  $
85
 
Obligations incurred during the period
   
3
 
Obligations settled during the period
   
(6
 )
Accretion
   
6
 
AROs at December 31, 2018
(
4
)
   $
88
 
Obligations settled during the period
 
 
(3
)
Accretion
 
 
4
 
AROs at December 31, 2019
(
4
)
  
$
 89
 
 
(1)
Includes $282 million and $408 million reported in other current liabilities at December 31, 2018, and 2019, respectively.
(2)
Reflects future ash pond and landfill closure costs at certain utility generation facilities. See Note 23 for further information.
(3)
Reflects revisions to future ash pond and landfill closure costs at certain utility generation facilities as well as revisions for 20 year license extensions for regulated nuclear power stations in Virginia.
(4)
Includes $74 million and $75 million reported in other deferred credits and other liabilities, with the remainder recorded in other current liabilities, at December 31, 2018 and 2019, respectively.