Customer Financing (Schedule Of Customer Financing) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Jan. 01, 2020
Customer Financing [Abstract]
Sales-type and Direct Financing Leases, Lease Receivable	$ 894
Investment in sales-type/finance leases		$ 919
Notes	415	420
Total financing receivables	1,309	1,339
Operating lease equipment, at cost, less accumulated depreciation of $124 and $209	646	715
Operating Lease, Accumulated Depreciation	124	209
Gross customer financing	1,955	2,054
Less allowance for losses on receivables	(16)	(17)	$ (14)	$ (5)
Total	$ 1,939	$ 2,037