Income Taxes - EEGH - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	21.00%	21.00%
State income tax, net of federal income tax benefit	10.00%	(3.00%)	5.00%
Other, net	0.00%	(1.00%)	(1.00%)
Effective income tax rate	(21.00%)	4.00%	(25.00%)
EEGH
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	21.00%	21.00%
State income tax, net of federal income tax benefit	3.00%	(13.00%)	1.00%
Equity income	1.00%	4.00%	1.00%
Effects of ratemaking	1.00%	(2.00%)	(1.00%)
Change in tax status	0.00%	(9.00%)	(4.00%)
AFUDC-equity	0.00%	(1.00%)	(1.00%)
Noncontrolling interest	(11.00%)	(16.00%)	(3.00%)
Write-off of regulatory assets	0.00%	3.00%	0.00%
Other, net	1.00%	1.00%	(1.00%)
Effective income tax rate	16.00%	(12.00%)	13.00%

Effective Income Tax Rate Reconciliation, Allowance for Funds Used During Construction to Equity, Percent

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Effective Income Tax Rate Reconciliation, Change In Enacted Tax Status Of Subsidiary, Percent

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Effective Income Tax Rate Reconciliation, Effects Of Ratemaking, Percent

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Effective Income Tax Rate Reconciliation, Write-off Of Regulatory Assets, Percent

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Schedule of Effective Income Tax Rate Reconciliation [Line Items]

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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
-Name Accounting Standards Codification
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage 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 equity in earnings (loss) of unconsolidated subsidiaries exempt from income taxes.

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Percentage 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 noncontrolling interest income (loss) exempt from income taxes.

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Percentage 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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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