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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 | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash, restricted cash and equivalents | $ 440 | $ 387 | $ 440 | $ 387 | $ 391 |  | $ 185
Impairment of assets and other charges | 85 | $ 12 | 1,232 | $ 147 |  |  |
Pension and other postretirement benefit liability | 2,571 |  | 2,571 |  | $ 2,328 | [1] |
SCANA |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash, restricted cash and equivalents | 389 |  | 389 |  |  |  |
Restricted cash | 115 |  | 115 |  |  |  |
Income tax regulatory assets | 264 |  | 264 |  |  |  |
Pension and other postretirement benefit liability | $ 379 |  | 379 |  |  |  |
Stock based compensation awards estimated fair value |  |  | 21 |  |  |  |
SCANA | Dominion Energy |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Property, plant and equipment with NND project |  |  | 105 |  |  |  |
Impairment of assets and other charges |  |  | 105 |  |  |  |
Asset impairment charges, after tax |  |  | $ 79 |  |  |  |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.

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