Customer Financing (Schedule Of Customer Financing) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Customer Financing [Abstract]
Investment in sales-type/finance leases	$ 1,620	$ 1,535
Notes	256	370
Total financing receivables	1,876	1,905
Operating lease equipment, at cost, less accumulated depreciation of $338 and $571	1,710	1,677
Gross customer financing	3,586	3,582
Less allowance for losses on receivables	(16)	(21)	$ (49)	$ (60)
Total	3,570	3,561
Operating lease equipment, accumulated depreciation	$ 338	$ 571