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Acquisitions and Dispositions (Schedule of Preliminary Allocation of Purchase Price to Assets Acquired and Liabilities Assumed) (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Jan. 31, 2019 | Dec. 31, 2018 | [1]
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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |
Goodwill |  | $ 8,986 |  |  | $ 6,410
SCANA |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |
Total current assets | [2] | 1,782 |  |  |
Investments |  | 224 |  |  |
Property, plant and equipment | [3] | 11,006 |  |  |
Goodwill |  | 2,576 |  |  |
Regulatory assets |  | 3,940 | [4] | $ 2,800 |
Other deferred charges and other assets, including intangible assets |  | 430 |  |  |
Total Assets |  | 19,958 |  |  |
Total current liabilities |  | 1,515 |  |  |
Long-term debt |  | 6,707 |  |  |
Deferred income taxes |  | 1,114 |  |  |
Regulatory liabilities |  | 2,668 |  |  |
Other deferred credits and other liabilities | [5] | 1,115 |  |  |
Total Liabilities |  | 13,119 |  | $ 6,900 |
Total purchase price | [6] | $ 6,839 |  |  |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Includes $389 million of cash, restricted cash and equivalents, of which $115 million is considered restricted.
[3] | 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 Statement of Income for the nine months ended September 30, 2019 includes a charge of $105 million ($79 million after-tax), included in impairment of assets and other charges.
[4] | Includes $264 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.
[5] | Includes a $379 million pension and other postretirement benefit liability.
[6] | Includes stock-based compensation awards with a fair value of $21 million.

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