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Asset Retirement Obligations (Changes to AROs) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Asset Retirement Obligations [Line Items] |  |  |  |  |
AROs, Beginning balance |  | $ 5,184 | [1] | $ 2,444 |
Obligations incurred during the period |  | 67 |  | 2,413 | [2]
AROs acquired in the SCANA Combination |  |  |  | 577 |
Obligations settled during the period |  | (114) |  | (134) |
Revisions in estimated cash flows |  | 228 | [3] | (324) | [4]
Accretion |  | 218 |  | 208 |
AROs, Ending balance | [1] | 5,583 |  | 5,184 |
Virginia Electric and Power Company |  |  |  |  |
Asset Retirement Obligations [Line Items] |  |  |  |  |
AROs, Beginning balance |  | 3,581 |  | 1,445 |
Obligations incurred during the period |  | 48 |  | 2,408 | [2]
Obligations settled during the period |  | (85) |  | (81) |
Revisions in estimated cash flows |  | 139 | [5] | (323) | [4]
Accretion |  | 137 |  | 132 |
AROs, Ending balance |  | $ 3,820 |  | $ 3,581 |
[1] | Includes $394 million and $179 million reported in other current liabilities at December 31, 2019 and 2020, respectively.
[2] | Reflects future ash pond and landfill closure costs at certain utility generation facilities. See discussion below.
[3] | Reflects revisions to future ash pond and landfill closure costs at certain utility generation facilities, asbestos abatement costs associated with certain utility facilities and from the completion of a nuclear decommissioning cost study related to Summer.
[4] | 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.
[5] | Reflects revisions to future ash pond and landfill closure costs at certain utility generation facilities and asbestos abatement costs associated with certain utility facilities.

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- Definition Asset Retirement Obligations [Line Items] + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 35 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6392603&loc=d3e7123-110846 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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