Customer Financing (Schedule Of Customer Financing) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investment in sales-type/finance leases	$ 1,850	$ 2,037
Notes	592	814
Operating lease equipment, at cost, less accumulated depreciation of $628 and $765	2,038	1,991
Gross customer financing	4,480	4,842
Less allowance for losses on receivables	(60)	(70)	(353)	(302)
Total	4,420	4,772
Operating lease equipment, accumulated depreciation	$ 628	$ 765