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Segment Information (Schedule Of Segment Information) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Information [Abstract]      
Revenues $ 5,937 $ 5,751 $ 5,787
Revenue generating departments 1,062 989 1,045
Operating departments 2,147 2,224 2,310
Support departments 750 631 658
Depreciation and amortization 1,625 1,415 1,182
Investment and other income (loss), net 105 278 554
Pension Settlement Costs     (55)
Interest expense (804) (653) (492)
Income tax expense (benefit) (24) 88 158
Net (loss) income $ (322) $ 29 $ 441