Long-term Financing and Sales of Receivables (Sales Receivables) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015	Dec. 31, 2015
Receivables [Abstract]
Accounts receivable sales proceeds	$ 5	$ 5	$ 7	$ 11
Long-term receivables sales proceeds	70	43	134	108
Total proceeds from receivable sales	75	$ 48	141	$ 119
Servicing obligations for long-term receivables	$ 699		$ 699		$ 668