Customer Financing (Schedule Of Customer Financing) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jan. 01, 2020
Customer Financing [Abstract]
Investment in sales-type/finance leases	$ 966	$ 919
Notes	414	420
Total financing receivables	1,380	1,339
Operating lease equipment, at cost, less accumulated depreciation of $84 and $209	505	715
Operating Lease, Accumulated Depreciation	84	209
Customer financing carrying value	1,885	2,054
Less allowance for losses on receivables	(14)	(17)	$ (17)	$ (5)
Total	$ 1,871	$ 2,037