Leases (Supplemental Cash Flow Information And Other Information For Leases) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Leases [Abstract]
Operating cash flows for operating leases	$ 6	$ 6
Operating cash flows for finance leases	1	1
Financing cash flows for finance leases	10	10
ROU assets obtained in exchange for lease obligations: Operating leases	5	2
ROU assets obtained in exchange for lease obligations: Finance leases	$ 10	$ 6
Weighted Average Remaining Lease Term (in years): Operating leases	9 years 6 months 3 days	10 years 4 months 17 days
Weighted Average Remaining Lease Term (in years): Finance leases	3 years 11 months 12 days	3 years 5 months 1 day
Weighted Average Discount Rate: Operating leases	5.18%	5.29%
Weighted Average Discount Rate: Finance leases	5.22%	4.68%