Accounts Receivable and Finance Receivables - Finance receivables categorized based on credit quality indicators (Details) $ in Millions	6 Months Ended
	Jul. 02, 2016 USD ($) item	Jan. 02, 2016 USD ($)
Finance receivables categorized based on the internally assigned credit quality
Number of loan categories based on key credit quality indicators for individual loan | item	3
Performing
Finance receivables categorized based on the internally assigned credit quality
Total finance receivables	$ 792	$ 891
Watchlist
Finance receivables categorized based on the internally assigned credit quality
Total finance receivables	106	130
Nonaccrual
Finance receivables categorized based on the internally assigned credit quality
Total finance receivables	$ 99	$ 84
Nonaccrual as a percentage of finance receivables	9.93%	7.60%
Nonaccrual | Minimum
Finance receivables categorized based on the internally assigned credit quality
Number of months of contractual delinquency to classify accounts as nonaccrual unless such collection is not doubtful	3 months