Long-term Customer Financing And Sales Of Receivables (Credit Quality Of Customer Financing Receivables And Allowance For Credit Losses) (Details) (USD $) In Millions, unless otherwise specified	Sep. 28, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Total Long-term Receivable	$ 57	$ 101
Current Billed Due	11	1
Past Due Under 90 Days	1	2
Past Due Over 90 Days	9	4
Municipal Leases Secured Tax Exempt [Member]
Debt Instrument [Line Items]
Total Long-term Receivable	1	23
Current Billed Due	0	0
Past Due Under 90 Days	0	0
Past Due Over 90 Days	0	0
Commercial Loans And Leases Secured [Member]
Debt Instrument [Line Items]
Total Long-term Receivable	56	78
Current Billed Due	11	1
Past Due Under 90 Days	1	2
Past Due Over 90 Days	$ 9	$ 4