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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 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 | $ 18 | 51 |  |
Increase in goodwill |  | 72 |  |
Unrecognized Tax Benefits, |  | $ 106 |  |
DESC |  |  |  |
Effective Income Tax Computation [Line Items] |  |  |  |
Increase in unrecognized tax benefits | 1 |  |  |
Increase in accrued interest and penalties | $ 7 |  |  |

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