Revenue Recognition - Balance Sheet Details (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 29, 2018	Sep. 29, 2018	Dec. 30, 2017
Deferred Contract Liability	$ 73	$ 73	$ 73
Deferred Contract Asset	48	48	43
Revenue recognized, included in beginning deferred contract liability balance	8	22
Other Current Liabilities [Member]
Deferred Contract Liability, Current	32	32	30
Other Noncurrent Liabilities [Member]
Deferred Contract Liability, Noncurrent	41	41	43
Other Current Assets [Member]
Deferred Contract Asset, Current	20	20	17
Other Noncurrent Assets [Member]
Deferred Contract Asset,Noncurrent	$ 28	$ 28	$ 26
SleepIQ Technology Hardware and Software [Member]
Product's Estimated Life		4 years