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Basis of Presentation (Details) retail_customers in Thousands, mi² in Thousands, $ in Millions | 9 Months Ended
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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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