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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2017
Effective Income Tax Computation [Line Items] |  |  |
Federal statutory income tax rate | 21.00% | 21.00% | 35.00%
SCANA |  |  |
Effective Income Tax Computation [Line Items] |  |  |
Deferred income tax expense | $ 198 |  |
Atlantic Coast Pipeline | Supply Header Project |  |  |
Effective Income Tax Computation [Line Items] |  |  |
Income tax charge due to write off of tax related regulatory assets | $ 81 |  |

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