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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 | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash, restricted cash and equivalents | $ 560 | $ 560 | $ 354 | $ 560 | $ 354 | $ 391 | $ 185
Impairment of assets and other charges |  | 312 | $ 134 | 1,147 | $ 135 |  |
Pension and other postretirement benefit liability | 2,612 | 2,612 |  | 2,612 |  | $ 2,328 |
SCANA |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash, restricted cash and equivalents | 389 | 389 |  | 389 |  |  |
Restricted cash | 115 | 115 |  | 115 |  |  |
Income tax regulatory assets | 264 | 264 |  | 264 |  |  |
Pension and other postretirement benefit liability | 379 | $ 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 |  |  |

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