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Estimates (Aggregate Amortization Expense Of Intangibles And Other Assets) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Depreciation And Amortization [Member]      
Reported in depreciation and amortization $ 321 $ 344 $ 264