Derivative Instruments and Fair Value Measurements (Details 2) (Fair Value, Measurements, Nonrecurring, Finance group, Unobservable Inputs (Level 3), USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012	Dec. 29, 2012
Fair Value, Measurements, Nonrecurring | Finance group | Unobservable Inputs (Level 3)
Assets measured at fair value on a nonrecurring basis
Finance receivables held for sale, Balance	$ 91		$ 91		$ 140
Impaired finance receivables, Balance	55		55		72
Other assets, balance	26		26		76
Finance receivables held for sale, Gain (Loss)	13	22	30	66
Impaired finance receivables, Gain (Loss)	(3)	(2)	(8)	(9)
Other assets, Gain (Loss)	$ (5)	$ (13)	$ (10)	$ (45)