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Business Segment and Geographic Information (Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Division
Countries
Customers
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Countries
Customers
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 $ 756   $ 704
Accounts Receivable, Gross, Noncurrent $ 190   $ 175
Foreign Currency Exchange Rate, Remeasurement 276 192  
Historical Exchange Rate_Venezuela     6.3
Foreign Currency Transaction Gain (Loss), Realized   $ (199)  
Accounts Receivable | VENEZUELA      
Concentration Risk [Line Items]      
Concentration Risk, Percentage   10.00%  
Geographic Concentration Risk | UNITED STATES | Accounts Receivable      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 22.00% 26.00%