XML 152 R129.htm IDEA: XBRL DOCUMENT
v3.20.4

Goodwill and Intangible Assets (Goodwill) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | $ 7,395 | $ 4,859
SCANA Combination | [2] |  | 2,609
Contribution | [3] | (14) |
Goodwill, Ending Balance | [1] | 7,381 | 7,395
SCANA |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance |  | 2,609 |
Contribution | [3] |  | (73)
Goodwill, Ending Balance |  |  | 2,609
Corporate and Other |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | 14 | 14
SCANA Combination | [2] |  | 73
Contribution | [3] | (14) |
Goodwill, Ending Balance | [1] |  | 14
Corporate and Other | SCANA |  |  |
Goodwill [Roll Forward] |  |  |
Contribution | [3] |  | (73)
Operating Segments | Dominion Energy Virginia |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | 2,106 | 2,106
Goodwill, Ending Balance | [1] | 2,106 | 2,106
Operating Segments | Gas Distribution |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | 3,512 | 2,497
SCANA Combination | [2] |  | 1,015
Goodwill, Ending Balance | [1] | 3,512 | 3,512
Operating Segments | Dominion Energy South Carolina |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | 1,521 |
SCANA Combination | [2] |  | 1,521
Goodwill, Ending Balance | [1] | 1,521 | 1,521
Operating Segments | Contracted Assets |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | [1] | 242 | 242
Goodwill, Ending Balance | [1] | $ 242 | $ 242
[1] | Goodwill amounts do not contain any accumulated impairment losses.
[2] | See Note 3 for more information on the SCANA Combination. As a result of the December 2019 segment realignment, the acquired goodwill was reassigned using a relative fair value approach.
[3] | See Note 9 for additional information including amounts reclassified to held for sale at December 31, 2020.

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_GoodwillRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireIntangibleAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=d_SCANAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=d_DominionEnergyVirginiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=d_GasDistributionSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=d_DominionEnergySouthCarolinaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=d_ContractedAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |