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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2017
Effective Income Tax Computation [Line Items] |  |  |  |
Federal statutory income tax rate |  | 21.00% | 21.00% | 35.00%
Net operating losses carryback period | 5 years |  |  |
Percentage of deductibility of interest expense | 50.00% |  |  |
SCANA |  |  |  |
Effective Income Tax Computation [Line Items] |  |  |  |
Deferred income tax expense |  | $ 198 |  |

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