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Segment Information (Schedule Of Segment Information) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Information [Abstract]            
Revenue $ 1,539   $ 1,480   $ 3,050 $ 2,942
Revenue generating departments 289   267   575 535
Operating departments 528   525   1,073 1,057
Support departments 221   199   380 383
Depreciation and amortization 457   398   902 786
Investment and other income 14   (24)   63 88
Interest expense (197)   (199)   (397) (398)
Income tax expense (benefit) (16)   (9)   (27) (7)
Net loss $ (123) $ (64) $ (123) $ 1 $ (187) $ (122)