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Income Taxes (Unrecognized Tax Benefits) (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Acquisition | $ 129 | [1] | $ 0 | $ 0
Increases-prior period positions | 0 |  | 10 | 1
Decreases in prior period position | 0 |  | $ 0 | $ 9
SCANA |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Acquisition | 106 |  |  |
Increases-prior period positions | 76 |  |  |
Decreases in prior period position | $ 53 |  |  |
[1] | Acquired unrecognized tax benefits reflect $106 million plus increases in prior period positions of $76 million and decreases in prior period positions of $53 million that were recorded through purchase accounting.

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