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Business Segment and Geographic Information (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2014
Division
Customers
Countries
Dec. 31, 2013
Customers
Countries
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
VENEZUELA
Dec. 31, 2013
VENEZUELA
Jun. 30, 2014
Accounts Receivable
VENEZUELA
Dec. 31, 2013
Accounts Receivable
VENEZUELA
Jun. 30, 2014
Geographic Concentration Risk
UNITED STATES
Accounts Receivable
Dec. 31, 2013
Geographic Concentration Risk
UNITED STATES
Accounts Receivable
Concentration Risk [Line Items]                      
Number of business segments   2                  
Concentration Risk, Percentage               9.00% 8.00% 38.00% 34.00%
Accounts Receivable, Gross           $ 618 $ 486        
Accounts Receivable, Gross, Noncurrent           232 183        
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   0 0                
Number of Customers Exceed Receivables Threshold   0 0                
Foreign Currency Exchange Rate, Remeasurement       6.3 4.3            
Charitable Contribution Tax Deductible $ 55