Accounts Receivable and Finance Receivables (Details 7) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012
Allowance for losses
Beginning Balance	$ 84	$ 156
Provision for losses	(16)	(3)
Charge-offs	(8)	(40)
Recoveries	7	9
Ending Balance	67	122
Captive
Allowance for losses
Beginning Balance	70	101
Provision for losses	(5)
Charge-offs	(6)	(26)
Recoveries	3	7
Ending Balance	62	82
Non-captive
Allowance for losses
Beginning Balance	14	55
Provision for losses	(11)	(3)
Charge-offs	(2)	(14)
Recoveries	4	2
Ending Balance	$ 5	$ 40