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Basis of Presentation (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2022 mi² shares retail_customers
Basis of Presentation [Abstract] |  |  |
Service Area Sq Miles | mi² |  |  | 4,000,000
Incorporated Cities |  |  | 51
Number of Retail Customers | retail_customers |  |  | 926,000
Service area population |  |  | 1,900,000
Entity Number of Employees |  |  | 2,873
Number of Union Employees |  |  | 673
Number of Union Employees Subject to Agreement A |  |  | 610
Number of Union Employees Subject to Agreement B |  |  | 63
Debt extinguishment costs | $ |  | $ 2 |
Contribution to pension and other postretirement plans | $ | $ 2 | $ 2 |

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- Definition Service Area Population + References No definition available. + Details
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- Definition Approximate square miles of service area. + References No definition available. + Details
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- Definition Amount of increase (decrease) in obligation for pension and other postretirement benefits. Includes, but is not limited to, defined benefit and defined contribution plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585 + Details
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