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Condensed Financial Information (Parent Company) (Loans to Subsidiaries - Narrative) (Details) - Parent Company - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract] |  |  |  |  |  |
Other Receivables, Net, Current | $ 225 | $ 250 | $ 60 | $ 300 | $ 250 | $ 150
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.23% | 124.00% | 100.00% |
Note $80M 5.34% maturity in March 2028 |  |  |  |  |  |
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract] |  |  |  |  |  |
Other Receivables, Net, Current |  | $ 80 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.34% |  |  |  |
Note $80M 5.68% maturity March 2033 |  |  |  |  |  |
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract] |  |  |  |  |  |
Other Receivables, Net, Current |  | $ 80 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.68% |  |  |  |
Note $50M 6.05% maturity March 2038 |  |  |  |  |  |
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract] |  |  |  |  |  |
Other Receivables, Net, Current |  | $ 50 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.05% |  |  |  |
Interest Income [Member] |  |  |  |  |  |
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract] |  |  |  |  |  |
Interest Income, Other | $ 28 | $ 22 | $ 2 |  |  |

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