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Goodwill And Other Intangibles (Amortization Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Goodwill And Other Intangibles [Abstract]        
Amortization expense $ 81 $ 101 $ 263 $ 344