Income Taxes - EGTS - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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	(6.00%)	(10.00%)	3.00%
Other, net	2.00%	1.00%	(1.00%)
Effective income tax rate	(136.00%)	(21.00%)	4.00%
EGTS
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	9.00%	8.00%	7.00%
Effects of ratemaking	0.00%	0.00%	2.00%
AFUDC-equity	0.00%	0.00%	1.00%
Write-off of regulatory assets	0.00%	0.00%	(3.00%)
Other, net	(1.00%)	(1.00%)	(1.00%)
Effective income tax rate	29.00%	28.00%	27.00%

Effective Income Tax Rate Reconciliation, Allowance for Funds Used During Construction to Equity, 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 other adjustments.

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