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Basis of Presentation (Details) retail_customers in Thousands, mi² in Thousands, $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) mi² retail_customers	Sep. 30, 2022 USD ($)
Basis of Presentation [Abstract]
Service Area Sq Miles | mi²	4
Incorporated Cities	51
Number of Retail Customers | retail_customers	929
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities	$ (133)	$ 44
Interest Income (Expense), Net	(15)	(6)
Other Nonoperating Income	3	13
Other Nonrecurring Gain		11
Gain (Loss) on Investments	$ (4)	$ 6

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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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Amount of realized and unrealized gain (loss) on investment.

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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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The net amount of operating interest income (expense).

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Amount of gain that is infrequent in occurrence or unusual in nature.

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