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Business Segment and Geographic Information (Narrative) (Details)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Division
Countries
Customers
Dec. 31, 2014
USD ($)
Countries
Customers
Mar. 31, 2015
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 0 0  
Number of Customers Exceed Receivables Threshold | Customers 0 0  
VENEZUELA      
Concentration Risk [Line Items]      
Accounts Receivable, Gross $ 521 $ 670  
Accounts Receivable, Gross, Noncurrent $ 165 $ 256  
Foreign Currency Exchange Rate, Remeasurement     192
Historical Exchange Rate_Venezuela   6.3  
Accounts Receivable | VENEZUELA      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 9.00% 9.00%  
Geographic Concentration Risk | UNITED STATES | Accounts Receivable      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 31.00% 39.00%