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Long-Term Debt - Schedule Of Long-Term Debt Instruments (Parenthetical) (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 USD ($) | Apr. 30, 2024 USD ($) Contract | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from issuance of long-term debt |  |  | $ 84 | $ 250 | $ 400
First Mortgage [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.00% |  | 8.00% |  |
3.875% Due in 2032 and 2034 | First Mortgage [Member] | Interest Rate Swap [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of interest rate swaps settled | Contract |  | 2 |  |  |
Notional Amount |  | $ 20 |  |  |
Net payments from settlement of derivatives |  | $ 4 |  |  |
Amended Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument maturity year | December 2029 |  |  |  |
Unsecured term loan | $ 15 |  | $ 15 |  |
Increase in interest rate |  |  | 5.92% | 3.44% |

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