Income Taxes (Schedule Of Income Taxes (Benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Tax Credit Carryforward, Description	2030
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 1	$ 1
Current Federal, Income taxes (benefit)	195	210	$ 166
Deferred Federal Income taxes (benefit)	(1)	(1)	146
Federal Income taxes (benefit) total	194	209	312
Current State, Income taxes (benefit)	44	49	24
Deferred State, Income taxes (benefit)	(1)	1	8
State Income taxes (benefit) total	43	50	32
Income Tax Expense (Benefit), Total	$ 237	$ 259	$ 344