Customer Financing (Schedule Of Customer Financing) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Customer Financing [Abstract]
Investment in sales-type/finance leases	$ 1,501	$ 1,482
Notes	899	807
Total financing receivables	2,400	2,289
Operating lease equipment, at cost, less accumulated depreciation of $334 and $359	1,723	1,922
Gross customer financing	4,123	4,211
Less allowance for losses on receivables	(16)	(10)
Total	4,107	4,201
Operating lease equipment- Accumulated depreciation	$ 334	$ 359