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Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Net realized losses | $ 5 |
Long-term Debt, Fair Value | 3,963 | $ 3,705
Long-term Debt | 4,539 | 3,999
Unamortized Debt Issuance Expense | 15 | 14
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  |
Notes Payable to Banks [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt | $ 4,524 | $ 3,985

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