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Long-term Financing and Sales of Receivables - Credit Quality of Financing Receivables and Allowance for Credit Losses (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Long-term Receivable $ 43 $ 63
Current Billed Due 3 0
Past Due Under 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 1  
Past Due Over 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 3 2
Municipal leases secured tax exempt    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Long-term Receivable 25 20
Current Billed Due 0 0
Municipal leases secured tax exempt | Past Due Under 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0  
Municipal leases secured tax exempt | Past Due Over 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 2 0
Commercial loans and leases secured    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Long-term Receivable 18 43
Current Billed Due 3 0
Commercial loans and leases secured | Past Due Under 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 1  
Commercial loans and leases secured | Past Due Over 90 Days    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due $ 1 $ 2