Investment And Other Income, Net (Narrative) (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]
Investment and other income, net increase (decrease)	$ 38	$ 13	$ (25)	$ 22
OPEB remeasurement gain (loss)	0	18	(8)	27
Pension benefit reduction			9
Pension remeasurement gain (loss)	$ 44	$ (72)	44	$ 2
Combined increase in pension benefit and OPEB costs accruals			35
Increase in pension remeasurement gain			$ 42