Investment And Other Income, Net (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Investment And Other Income, Net [Abstract]
Special termination benefit enhancements related to a voluntary separation plan, pension plan	$ (8)	$ 9
Investment and other income, net increase (decrease)	(63)	9
OPEB remeasurement gain (loss)	(8)	9
Pension remeasurement gain	$ 44	$ 74