Derivative Instruments and Fair Value Measurements - Assets recorded at fair value on a nonrecurring basis (Details) - Fair Value Measurements, Nonrecurring - Finance group - Unobservable Inputs Level 3 - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Assets measured at fair value on a nonrecurring basis
Impaired finance receivables, Balance	$ 44	$ 45
Impaired finance receivables, (gain) loss	$ 10	$ 13	$ 18