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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Examination [Line Items] |  |  |  |  |
Effective tax rate (percent) | 17.50% | 20.10% |  | 25.10% | 13.40%
Unrecognized tax benefits, decrease resulting from prior period tax positions | $ 29 |  |  |  |
Benefits from accelerated amortization of certain investment tax credits |  | $ 10 |  |  |
Change in amount of valuation allowance |  |  | $ 52 |  |
Unrecognized tax benefits period increase (decrease) | (25) |  |  | $ 21 |
Unrecognized tax benefits, increase resulting from certain federal tax credits | 4 |  |  | 15 |
Unrecognized tax benefits, portion expected to be resolved in the next fiscal year | 26 |  |  | 26 |
Unrecognized tax benefits that would impact effective tax rate | 24 |  |  | $ 24 |
State and Local Jurisdiction | West Virginia |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Change in enacted tax rate | $ 9 |  |  |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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