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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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