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Acquisitions and Dispositions (Schedule of Preliminary Allocation of Purchase Price to Assets Acquired and Liabilities Assumed) (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 31, 2019 | Dec. 31, 2018
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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |
Goodwill | [1] | $ 7,381 | $ 7,395 |  | $ 4,859
SCANA |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |
Total current assets | [2] |  | 1,782 |  |
Investments | [3] |  | 224 |  |
Property, plant and equipment | [4],[5] |  | 11,006 |  |
Goodwill |  |  | 2,609 |  |
Regulatory assets | [6] |  | 3,940 |  |
Other deferred charges and other assets, including intangible assets | [7] |  | 430 |  |
Total Assets |  |  | 19,991 |  |
Total current liabilities | [8] |  | 1,556 |  |
Total outstanding debt |  |  | 6,707 | $ 6,900 |
Deferred income taxes |  |  | 1,068 |  |
Regulatory liabilities |  |  | 2,706 |  |
Other deferred credits and other liabilities | [9] |  | 1,115 |  |
Total Liabilities |  |  | 13,152 |  |
Total purchase price | [10] |  | $ 6,839 |  |
[1] | Goodwill amounts do not contain any accumulated impairment losses.
[2] | Includes $389 million of cash, restricted cash and equivalents, of which $115 million is considered restricted.
[3] | Includes $31 million for equity method investments. The fair value adjustment on the equity method investments is considered to be equity method goodwill and is not amortized.
[4] | 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).
[5] | 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.
[6] | Includes $258 million of certain income tax-related regulatory assets associated with the NND Project for which Dominion Energy committed to forgo recovery in accordance with the SCANA Merger Approval Order. See Note 5 for additional information.
[7] | Intangible assets have an estimated weighted-average amortization period of approximately five years.
[8] | Includes $40 million outstanding under letters of credit advances, which were repaid in January 2019, as well as $173 million outstanding commercial paper under various credit facilities. All such credit facilities were terminated in 2019.
[9] | Includes a $379 million pension and other postretirement benefit liability.
[10] | Includes stock-based compensation awards with a fair value of $21 million.

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