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Acquisitions and Dispositions (Schedule of Preliminary Allocation of Purchase Price to Assets Acquired and Liabilities Assumed) (Parenthetical) (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Cash, restricted cash and equivalents |  |  | $ 247 | $ 269 | $ 391 | $ 185
Impairment of assets and other charges |  |  | $ 2,105 | 1,520 | $ 12 |
Intangible assets, estimated weighted-average amortization period |  |  | 11 years |  |  |
Pension and other postretirement benefit liability |  |  | $ 1,706 | 2,364 |  |
SCANA |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash, restricted cash and equivalents |  |  |  | 389 |  |
Restricted cash |  |  |  | 115 |  |
Equity method investment |  |  |  | 31 |  |
Property, plant and equipment | [1],[2] |  |  | $ 11,006 |  |
Intangible assets, estimated weighted-average amortization period |  |  |  | 5 years |  |
Repayment of letter of credit advances |  | $ 40 |  |  |  |
Repayments of Commercial Paper |  | $ 173 |  |  |  |
Pension and other postretirement benefit liability |  |  |  | $ 379 |  |
Stock based compensation awards estimated fair value |  |  |  | $ 21 |  |
SCANA | Minimum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  | 5 years |  |
SCANA | Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  | 78 years |  |
SCANA | NND Project |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Property, plant and equipment |  |  |  | $ 105 |  |
Impairment of assets and other charges |  |  |  | 105 |  |
Impairment of assets and other charges, after tax |  |  |  | 79 |  |
SCANA | Dominion Energy South Carolina Inc | NND Project |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Income tax regulatory assets |  |  |  | $ 258 |  |
[1] | Includes $105 million of certain property, plant and equipment associated with the NND Project for which Dominion Energy committed to forgo recovery in accordance with the SCANA Merger Approval Order. As a result, Dominion Energy’s Consolidated Statements of Income for the year ended December 31, 2019 include a charge of $105 million ($79 million after-tax), included in impairment of assets and other charges (reflected in the Corporate and Other segment).
[2] | Nonregulated property, plant and equipment, excluding land, will be depreciated on a straight-line basis over the remaining useful lives of such property, primarily ranging from 5 to 78 years.

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