Income Taxes And Tax-Related Items (Income Taxes And Tax-Related Items) (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 12	$ 16
Tax-related interest and penalties payable	1	5
Net deferred tax assets	1,100	1,100
Deferred tax assets, operating loss carryforwards, state and local	2	2
Deferred tax assets, operating loss carryforwards, federal	4	4
Deferred tax assets, federal valuation allowance	4	4
Deferred tax assets, state valuation allowance	$ 1	$ 1
Minimum
Income Tax Contingency [Line Items]
Operating loss carryforwards, expiration date - state	2023
Operating loss carryforwards, expiration date - federal	2028
Maximum
Income Tax Contingency [Line Items]
Operating loss carryforwards, expiration date - state	2041
Operating loss carryforwards, expiration date - federal	2031