Customer Financing (Schedule Of Customer Financing) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Customer Financing [Abstract]
Investment in sales-type/finance leases	$ 1,482	$ 1,620
Notes	807	256
Total financing receivables	2,289	1,876
Operating lease equipment, at cost, less accumulated depreciation of $359 and $338	1,922	1,710
Gross customer financing	4,211	3,586
Less allowance for losses on receivables	(10)	(16)	$ (21)	$ (49)
Total	4,201	3,570
Operating lease equipment, accumulated depreciation	$ 359	$ 338