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Business Segment and Geographic Information (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2015
USD ($)
Jun. 30, 2016
USD ($)
Division
Countries
Customers
Dec. 31, 2015
USD ($)
Countries
Customers
Mar. 31, 2016
Concentration Risk [Line Items]        
Number of business segments | Division   2    
Maximum Percentage Gross Trade Receivables From One Geographic Segment   10.00% 10.00%  
Maximum Percentage Gross Trade Receivables From One Customer   10.00% 10.00%  
Number of Countries Exceed Receivables Threshold | Countries   3 0  
Number of Customers Exceed Receivables Threshold | Customers   0 0  
Venezuela trade receivables exchanged for promissory note   $ 200    
VENEZUELA        
Concentration Risk [Line Items]        
Accounts Receivable, Gross   581 $ 704  
Accounts Receivable, Gross, Noncurrent   $ 134 $ 175  
Foreign Currency Exchange Rate, Remeasurement 192 617   276
Historical Exchange Rate_Venezuela 6.3      
Foreign Currency Transaction Gain (Loss), Realized $ (199)      
Accounts Receivable | VENEZUELA        
Concentration Risk [Line Items]        
Concentration Risk, Percentage   13.00% 14.00%  
Geographic Concentration Risk | UNITED STATES | Accounts Receivable        
Concentration Risk [Line Items]        
Concentration Risk, Percentage   21.00% 26.00%  
Geographic Concentration Risk | MEXICO | Accounts Receivable        
Concentration Risk [Line Items]        
Concentration Risk, Percentage   11.00%