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