Customer Financing (Schedule Of Customer Financing) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Jan. 01, 2020
Customer Financing [Abstract]
Sales-type and Direct Financing Leases, Lease Receivable	$ 911
Investment in sales-type/finance leases		$ 919
Notes	417	420
Total financing receivables	1,328	1,339
Operating lease equipment, at cost, less accumulated depreciation of $162 and $209	677	715
Operating Lease, Accumulated Depreciation	162	209
Gross customer financing	2,005	2,054
Less allowance for losses on receivables	(17)	(17)	$ (5)	$ (5)
Total	$ 1,988	$ 2,037