Basis of Presentation Deferred Revenue (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Deferred Revenue Arrangement [Line Items]
Deferred Revenue	$ 71	$ 61
Deferred Costs	41	33
Other Current Liabilities [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Current	28	21
Other Noncurrent Liabilities [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Noncurrent	43	40
Other Current Assets [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Costs, Current	16	11
Other Noncurrent Assets [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Costs, Noncurrent	$ 25	$ 22
SleepIQ [Member]
Deferred Revenue Arrangement [Line Items]
Product's Estimated Life	4 years