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Investment And Other Income (loss), Net (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Investment And Other Income (loss), Net [Abstract]        
Investment and other income, net increase (decrease) $ (38) $ (16) $ (63)  
Increase (decrease) in post-retirement remeasurement loss     14  
OPEB remeasurement gain (loss) 0 (21) (8) $ 6
Pension benefit reduction (2)   11  
Pension building sale (loss) (19)   (19)  
Pension remeasurement gain (loss) $ 0 $ 23 44 $ 25
Increase in pension remeasurement gain     $ 19