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Acquisition (Schedule Of Pro Forma Information) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Acquisition [Abstract]        
Revenue $ 4,217 $ 4,058 $ 8,382 $ 8,041
Net Income $ 422 $ 379 $ 800 $ 806