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		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 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	$ 106		$ 106		$ 140
Other assets, balance	50		50		76
Impaired finance receivables, Balance	60		60		72
Finance receivables held for sale, Gain (Loss)	5	20	17	44
Other assets, Gain (Loss)	(1)	(16)	(5)	(32)
Impaired finance receivables, Gain (Loss)	$ (2)	$ (1)	$ (5)	$ (7)