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Acquisition (Schedule Of Pro Forma Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Acquisition [Abstract] |  |  |  |
Revenue | $ 4,263 | $ 3,989 | $ 12,632 | $ 12,030
Net Income | $ 497 | $ 396 | $ 1,287 | $ 1,201

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