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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017
Effective Income Tax Computation [Line Items] |  |  |
Federal statutory income tax rate | 21.00% | 21.00% | 35.00%
Percentage of deductibility of interest expense | 30.00% |  |
SCANA |  |  |
Effective Income Tax Computation [Line Items] |  |  |
Deferred income tax expense | $ 198 |  |
Increase in unrecognized tax benefits | 51 |  |
Increase in goodwill | 40 |  |
Unrecognized Tax Benefits, | $ 106 |  |

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