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Basis of Presentation (Details) retail_customers in Thousands, mi² in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) mi² retail_customers	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) mi² retail_customers	Sep. 30, 2023 USD ($)
Basis of Presentation [Abstract]
Service Area Sq Miles | mi²	4		4
Incorporated Cities	51		51
Number of Retail Customers | retail_customers	946		946
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities			$ 2	$ (133)
Gain (Loss) on Investments	$ (1)	$ (1)	(2)	(2)
Investment Income, Interest		3	12	15
Other Operating Income (Expense), Net	$ 2	$ 1	$ 7	$ 5

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