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Segment Information (Schedule Of Segment Information) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Information [Abstract]                
Revenue $ 1,550     $ 1,489     $ 4,600 $ 4,431
Revenue generating departments 280     266     855 801
Operating departments 539     545     1,612 1,602
Support departments 144     182     524 565
Depreciation and amortization 470     410     1,372 1,196
Investment and other income (9)     29     54 117
Interest expense (198)     (203)     (595) (601)
Income tax benefit (14)     (6)     (41) (13)
Net loss $ (76) $ (123) $ (64) $ (82) $ (123) $ 1 $ (263) $ (204)