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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
Mar. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Total Long-term Receivable $ 69 $ 101
Current Billed Due 4 1
Past Due Under 90 Days 0 2
Past Due Over 90 Days 7 4
Municipal Leases Secured Tax Exempt [Member]
   
Debt Instrument [Line Items]    
Total Long-term Receivable 8 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 61 78
Current Billed Due 4 1
Past Due Under 90 Days 0 2
Past Due Over 90 Days $ 7 $ 4