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v3.19.3.a.u2

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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |
Cash, restricted cash and equivalents |  | $ 269 | $ 391 | $ 185 | $ 322
Pension and other postretirement benefit liability |  | 2,366 | 2,328 |  |
Impairment of assets and other charges |  | $ 1,535 | $ 403 | $ 15 |
Intangible assets, estimated weighted-average amortization period |  | 10 years |  |  |
SCANA |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Equity method investment |  | $ 31 |  |  |
Cash, restricted cash and equivalents |  | 389 |  |  |
Restricted cash |  | 115 |  |  |
Income tax regulatory assets |  | 258 |  |  |
Pension and other postretirement benefit liability |  | 379 |  |  |
Stock based compensation awards estimated fair value |  | $ 21 |  |  |
Repayment of letter of credit advances | $ 40 |  |  |  |
Repayments of Commercial Paper | $ 173 |  |  |  |
Intangible assets, estimated weighted-average amortization period |  | 5 years |  |  |
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 | Dominion Energy | Property plant and equipment committed to forgo recovery |  |  |  |  |
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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