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Investment And Other Income, Net (Components Of Investment And Other Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Investment And Other Income, Net [Abstract] |  |  |  |
Interest and dividend income | $ 7 | $ 20 | $ 16 | $ 38
Pension benefit | 6 | 9 | 12 | 21
OPEB costs | (1) | (1) | (2) | (2)
OPEB remeasurement gain (loss) | 0 | 18 | (8) | 27
Pension remeasurement gain (loss) | 44 | (72) | 44 | 2
All other, net | 2 | 2 | 1 | 2
Total investment and other income (loss), net | $ 14 | $ (24) | $ 63 | $ 88

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