Segment Information (Schedule Of Segment Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Information [Abstract]
Revenue	$ 1,511	$ 1,462
Revenue generating departments	286	268
Operating departments	545	532
Support departments	159	184
Depreciation and amortization	445	388
Investment and other income	49	112
Interest expense	(200)	(199)
Income tax expense (benefit)	(11)	2
Net income (loss)	$ (64)	$ 1