Long-Term Debt And Lease Obligation (Long-term Debt and Lease Obligation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Long-Term Debt and Lease Obligation [Abstract]
Finance Lease, Right-of-Use Asset, Amortization	$ 14	$ 14	$ 15
Operating Lease, Expense	3	5	4
Total Finance and Operating Lease Cost	17	19	19
Finance Lease, Principal Payments	$ 16	$ 15	$ 15
Finance Lease, Weighted Average Discount Rate, Percent	4.35%	3.20%	2.46%
Finance Lease, Weighted Average Remaining Lease Term	3 years 10 months 20 days	3 years 5 months 26 days	3 years 5 months 12 days
Operating Lease, Payments	$ 3	$ 4	$ 4
Operating Lease, Weighted Average Discount Rate, Percent	4.66%	3.44%	2.86%
Operating Lease, Weighted Average Remaining Lease Term	4 years 3 months 18 days	4 years 6 months 10 days	4 years 4 months 13 days