Accounts Receivable and Finance Receivables (Details 7) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Allowance for losses
Beginning Balance	$ 84	$ 156
Provision for losses	(7)	4
Charge-offs	(3)	(27)
Recoveries	3	3
Ending Balance	77	136
Captive
Allowance for losses
Beginning Balance	70	101
Provision for losses	(2)	2
Charge-offs	(2)	(25)
Recoveries	2	2
Ending Balance	68	80
Non-captive
Allowance for losses
Beginning Balance	14	55
Provision for losses	(5)	2
Charge-offs	(1)	(2)
Recoveries	1	1
Ending Balance	$ 9	$ 56