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Income Taxes (Reconciliation Of Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits    
Gross unrecognized tax benefits at beginning of period $ 4 $ 2
Increases in tax positions for current year 2 2
Decrease due to Spin-off $ (6)  
Gross unrecognized tax benefits at end of period   $ 4