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	Apr. 04, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Long-term Receivable	$ 51	$ 49
Current Billed Due	4	0
Past Due Under 90 Days	1	0
Past Due Over 90 Days	11	12
Municipal leases secured tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Long-term Receivable	11	14
Current Billed Due	0	0
Past Due Under 90 Days	0	0
Past Due Over 90 Days	0	0
Commercial loans and leases secured
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Long-term Receivable	40	35
Current Billed Due	4	0
Past Due Under 90 Days	1	0
Past Due Over 90 Days	$ 11	$ 12