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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Examination [Line Items]
Effective tax rate (percent)	62.30%	17.70%		31.80%	1.80%
Benefits from accelerated amortization of certain investment tax credits		$ 10
Change in amount of valuation allowance			$ 52
Unrecognized tax benefits period increase (decrease)	$ (7)			$ 4
Unrecognized tax benefits, portion expected to be resolved in the next fiscal year	55			55
Unrecognized tax benefits that would impact effective tax rate	53			$ 53
State and Local Jurisdiction | West Virginia
Income Tax Examination [Line Items]
Change in enacted tax rate	$ 9

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Unrecognized Tax Benefits, Portion Expected To Be Resolved in the Next Fiscal Year

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB
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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 increase (decrease) in the valuation allowance for deferred tax assets.

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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 increase (decrease) in the income tax rates.

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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 investment tax credit.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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