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Commitments And Contingencies (Roll Forward of Vendor Financing liabilities) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Commitments And Contingencies [Abstract] |  |
Confirmed Obligations Outstanding, Beginning Balance | $ 263 |
Invoices confirmed during the year | 84 | $ 268
Confirmed invoices paid during the year | (331) | (5)
Confirmed Obligations Outstanding, Ending Balance | $ 16 | $ 263

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