Long-term Customer Financing and Sales Of Receivables (Proceeds Received From Non-Recourse Sales Of Accounts Receivable And Long-Term Receivables) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014
Receivables [Abstract]
Accounts receivable sales proceeds	$ 6	$ 7
Long-term receivables sales proceeds	65	1
Total proceeds from receivable sales	$ 71	$ 8