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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Tax Disclosure [Abstract]        
Current income tax expense (benefit) $ 2 $ 13 $ (1) $ 14
Deferred income tax expense (benefit) 69   (38) (4)
Total income tax expense (benefit) $ 71 $ 13 $ (39) $ 10
U.S. statutory income tax rate 21.00% 21.00% 21.00% 21.00%
State income taxes 8.00% (1.00%) 4.00% (1.00%)
Other 1.00% 3.00% (7.00%) (2.00%)
Deferred tax asset valuation allowance   (26.00%)   (19.00%)
Effective income tax rate 30.00% (3.00%) 18.00% (1.00%)