Contingencies And Commitments (Cash Flow Information Related To Leases) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Contingencies And Commitments [Abstract]
Operating cash flows from operating leases	$ 47,000,000	$ 54,000,000	$ 56,000,000
Financing cash flows from finance leases	62,000,000	53,000,000	96,000,000
Operating leases	$ 8,000,000	$ 10,000,000	$ 80,000,000