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Business Segment and Geographic Information (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Division
Countries
Customers
Mar. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Division
Countries
Customers
Dec. 31, 2014
USD ($)
Countries
Customers
Concentration Risk [Line Items]        
Number of business segments | Division 2   2  
Maximum Percentage Gross Trade Receivables From One Geographic Segment 10.00%   10.00% 10.00%
Maximum Percentage Gross Trade Receivables From One Customer 10.00%   10.00% 10.00%
Number of Countries Exceed Receivables Threshold | Countries 0   0 0
Number of Customers Exceed Receivables Threshold | Customers 0   0 0
VENEZUELA        
Concentration Risk [Line Items]        
Accounts Receivable, Gross $ 639   $ 639 $ 670
Accounts Receivable, Gross, Noncurrent 176   176 $ 256
Foreign Currency Exchange Rate, Remeasurement   192    
Historical Exchange Rate_Venezuela       6.3
Foreign Currency Transaction Gain (Loss), Realized $ 0 $ (199) $ (199)  
Accounts Receivable | VENEZUELA        
Concentration Risk [Line Items]        
Concentration Risk, Percentage     11.00% 9.00%
Geographic Concentration Risk | UNITED STATES | Accounts Receivable        
Concentration Risk [Line Items]        
Concentration Risk, Percentage     31.00% 39.00%