Customer Financing (Schedule Of Customer Financing) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Customer Financing [Abstract]
Investment in sales-type/finance leases	$ 1,425	$ 1,482
Notes	884	807
Total financing receivables	2,309	2,289
Operating lease equipment, at cost, less accumulated depreciation of $339 and $359	1,653	1,922
Gross customer financing	3,962	4,211
Less allowance for losses on receivables	(15)	(10)
Total	3,947	4,201
Operating lease equipment- Accumulated depreciation	$ 339	$ 359