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Basis of Presentation (Details) retail_customers in Thousands, mi² in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) mi² retail_customers	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) mi² retail_customers	Jun. 30, 2023 USD ($)
Basis of Presentation [Abstract]
Service Area Sq Miles | mi²	4		4
Incorporated Cities	51		51
Number of Retail Customers | retail_customers	944		944
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities			$ 0	$ (135)
Investment Income, Interest	$ 5	$ 3	$ 9	$ 11

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Basis of Presentation [Abstract]

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Number of incorporated cities in service area.

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Approximate square miles of service area.

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The increase (decrease) during the reporting period in other obligations or expenses incurred but not yet paid.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
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-SubTopic 10
-Topic 230
-Publisher FASB
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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
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