Customer Financing (Schedule Of Customer Financing) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Customer Financing [Abstract]
Investment in sales-type/finance leases	$ 1,125	$ 1,364
Notes	730	1,022
Total financing receivables	1,855	2,386
Operating lease equipment, at cost, less accumulated depreciation of $203 and $305	782	691
Operating lease incentive	250
Gross customer financing	2,887	3,077
Less allowance for losses on receivables	(9)	(12)	$ (10)	$ (16)
Total	2,878	3,065
Operating lease equipment, accumulated depreciation	$ 203	$ 305