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 |