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Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2019
Feb. 14, 2020
Jun. 30, 2019
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Document Annual Report true    
Document Transition Report false    
Entity Interactive Data Current Yes    
Entity Registrant Name DOMINION ENERGY, INC.    
Entity Central Index Key 0000715957    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 62.0
Entity File Number 001-08489    
Entity Incorporation, State or Country Code VA    
Entity Tax Identification Number 54-1229715    
Entity Address, Address Line One 120 TREDEGAR STREET    
Entity Address, City or Town RICHMOND    
Entity Address, Postal Zip Code 23219    
City Area Code 804    
Local Phone Number 819-2000    
Entity Address, State or Province VA    
Entity Common Stock, Shares Outstanding   838,000,325  
Common Stock      
Document Information [Line Items]      
Trading Symbol D    
Title of 12(b) Security Common Stock, no par value    
Security Exchange Name NYSE    
2016 Series A 5.25% Enhanced Junior Subordinated Notes      
Document Information [Line Items]      
Trading Symbol DRUA    
Title of 12(b) Security 2016 Series A 5.25% Enhanced Junior Subordinated Notes    
Security Exchange Name NYSE    
2019 Series A Corporate Units      
Document Information [Line Items]      
Trading Symbol DCUE    
Title of 12(b) Security 2019 Series A Corporate Units    
Security Exchange Name NYSE    
Virginia Electric and Power Company      
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Document Annual Report true    
Document Transition Report false    
Entity Interactive Data Current Yes    
Entity Registrant Name VIRGINIA ELECTRIC AND POWER COMPANY    
Entity Central Index Key 0000103682    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity File Number 000-55337    
Entity Incorporation, State or Country Code VA    
Entity Tax Identification Number 54-0418825    
Entity Address, Address Line One 120 TREDEGAR STREET    
Entity Address, City or Town RICHMOND    
Entity Address, Postal Zip Code 23219    
City Area Code 804    
Local Phone Number 819-2000    
Entity Address, State or Province VA    
Entity Common Stock, Shares Outstanding   274,723  
Dominion Energy Gas Holdings, LLC      
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Document Annual Report true    
Document Transition Report false    
Entity Interactive Data Current Yes    
Entity Registrant Name DOMINION ENERGY GAS HOLDINGS, LLC    
Entity Central Index Key 0001603291    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity File Number 001-37591    
Entity Incorporation, State or Country Code VA    
Entity Tax Identification Number 46-3639580    
Entity Address, Address Line One 120 TREDEGAR STREET    
Entity Address, City or Town RICHMOND    
Entity Address, Postal Zip Code 23219    
City Area Code 804    
Local Phone Number 819-2000    
Entity Address, State or Province VA    
Entity Common Stock, Shares Outstanding   0  
Dominion Energy Gas Holdings, LLC | 2014 Series C 4.6% Senior Notes      
Document Information [Line Items]      
No Trading Symbol Flag true    
Title of 12(b) Security 2014 Series C 4.6% Senior Notes    
Security Exchange Name NYSE