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		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Long-Term Customer Financing And Sales Of Receivables [Abstract]
Accounts receivable sales proceeds	$ 4	$ 5	$ 6	$ 12
Long-term receivable sales proceeds	37	32	90	156
Total proceeds from sales of accounts receivable	$ 41	$ 37	$ 96	$ 168