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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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Effective income tax computation.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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