Income taxes.

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Percentage of equity interests sold.

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- Definition

Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Impact on Earnings

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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- Definition

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

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Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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Income Taxes (Narrative) (Detail) - USD ($)	3 Months Ended		9 Months Ended
Income Taxes (Narrative) (Detail) - USD ($)	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Taxes [Line Items]
Income tax expense (benefit) from discontinued operations	$ 0	$ (6,000,000)	$ 4,000,000	$ 5,000,000
GT&S Transaction
Income Taxes [Line Items]
Income tax expense (benefit) from discontinued operations		$ (18,000,000)
Continuing Operations
Income Taxes [Line Items]
Deferred income tax expense (benefit)			(21,000,000)
Discontinued Operations \| GT&S Transaction
Income Taxes [Line Items]
Income tax benefit related to finalizing income tax returns				$ 15,000,000
Maximum
Income Taxes [Line Items]
Decrease in unrecognized tax benefits	$ 26,000,000		26,000,000
Amount that earnings could potentially increase if changes were to occur			$ 26,000,000
Hope Gas Inc
Income Taxes [Line Items]
Percentage of equity interests sold	100.00%		100.00%
Virginia Electric and Power Company \| Continuing Operations
Income Taxes [Line Items]
Deferred income tax expense (benefit)			$ (16,000,000)