Long-term Financing and Sales of Receivables (Credit Quality Of Financing Receivables And Allowance For Credit Losses) (Details) - USD ($) $ in Millions	Apr. 02, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Long-term Receivable	$ 42	$ 60
Current Billed Due	4	1
Past Due Under 90 Days	0	1
Past Due Over 90 Days	1	1
Municipal leases secured tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Long-term Receivable	4	35
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	38	25
Current Billed Due	4	1
Past Due Under 90 Days	0	1
Past Due Over 90 Days	$ 1	$ 1