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Business Segment and Geographic Information (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2014
Countries
Division
Customers
Dec. 31, 2013
Customers
Countries
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2014
VENEZUELA
Dec. 31, 2013
VENEZUELA
Mar. 31, 2014
Accounts Receivable
VENEZUELA
Dec. 31, 2013
Accounts Receivable
VENEZUELA
Mar. 31, 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% 37.00% 34.00%
Accounts Receivable, Gross         $ 577 $ 486        
Accounts Receivable, Gross, Noncurrent         $ 233 $ 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