Accounts Receivable and Finance Receivables - Finance receivables by delinquency aging category (Details) $ in Millions	9 Months Ended
	Sep. 28, 2019 USD ($) item	Dec. 29, 2018 USD ($)
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
60 + days contractual delinquency as a percentage of finance receivables	4.77%	1.77%
Less than 31 days past due
Finance receivables categorized based on the internally assigned credit quality
Total finance receivables	$ 659	$ 719
31-60 days past due
Finance receivables categorized based on the internally assigned credit quality
Total finance receivables	60	56
61- 90 days past due
Finance receivables categorized based on the internally assigned credit quality
Total finance receivables	12	5
Over 90 days past due
Finance receivables categorized based on the internally assigned credit quality
Total finance receivables	24	9
Performing
Finance receivables categorized based on the internally assigned credit quality
Total finance receivables	691	704
Watchlist
Finance receivables categorized based on the internally assigned credit quality
Total finance receivables	23	45
Nonaccrual
Finance receivables categorized based on the internally assigned credit quality
Total finance receivables	$ 41	$ 40
Nonaccrual as a percentage of finance receivables	5.43%	5.07%
Minimum | Nonaccrual
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