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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
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Total Long-term Receivable $ 27 $ 73
Current Billed Due 10 0
Past Due Under 90 Days 2 2
Past Due Over 90 Days 10 4
Municipal Leases Secured Tax Exempt
   
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
   
Debt Instrument [Line Items]    
Total Long-term Receivable 26 50
Current Billed Due 10 0
Past Due Under 90 Days 2 2
Past Due Over 90 Days $ 10 $ 4