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Customer Financing (Financing Receivable Credit Quality Indicators) (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Carrying value of financing receivables $ 1,813 $ 1,905
B B B Credit Rating [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Carrying value of financing receivables 1,009 1,055
B Credit Rating [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Carrying value of financing receivables 612 633
C C C Credit Rating [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Carrying value of financing receivables 103 131
Other Credit Rating [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Carrying value of financing receivables $ 89 $ 86