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Investment And Other Income, Net (Components Of Investment And Other Income) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Investment And Other Income, Net [Abstract] |  |
Interest and dividend income | $ 9 | $ 18
Pension benefit | 6 | 12
OPEB costs | (1) | (1)
OPEB remeasurement gain (loss) | (8) | 9
Pension remeasurement gain | 44 | 74
All other, net | (1) |
Total investment and other income, net | $ 49 | $ 112

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